WO2015176318A1

WO2015176318A1 - A method, network system, and sdn controller for moving a data stream

Info

Publication number: WO2015176318A1
Application number: PCT/CN2014/078309
Authority: WO
Inventors: 薛开平; 殷静; 倪丹; 魏鑫鹏
Original assignee: 华为技术有限公司; 中国科学技术大学
Priority date: 2014-05-23
Filing date: 2014-05-23
Publication date: 2015-11-26
Also published as: CN105308936A

Abstract

Provided are a method, network system, and SDN controller for moving a data stream, the SDN controller comprising: a first determining unit determines that it is necessary to move a first data stream from a first interface of an MN to a second interface; the first interface corresponds to a first path of a first data stream; the second interface corresponds to a second path of the first data stream; it is determined whether the MAG contained in the second path is the same device as the MAG contained in the first path; according to the determined result, a second determining unit determines in the network element devices of a second path a network element device requiring reception of a flow table entry adjustment message; a first transmission unit sends a flow table entry adjustment message to the determined network element device, said flow table entry adjustment message being used for instructing the movement of the first data stream from the first path to the second path for transmission. The embodiments of the present invention do not require negotiation between network element devices and save costs in network construction.

Description

Method for moving data stream, network system and SDN controller

Technical field

The present invention relates to the field of communications technologies, and in particular, to a data stream moving method, a network system, and an SDN controller.

Background technique

The Next Generation Internet Protocol Version 6, IPv6 protocol extends two core functional entities at the network layer, namely Local Mobile Mobility Anchor (LMA) and Mobile Access Gateway (MAG, Mobile Access Gateway). ). The MAG is located on the link anchored by the mobile node (MN, Mobile Node), and is responsible for detecting the movement of the MN; the LMA is a topology anchoring point of all data flows of the MN, and is responsible for allocating data streams through the MN interface. Communication address prefix. Proxy Mobile IPv6 Protocol Support MN accesses multiple networks simultaneously through multiple interfaces. There may be multiple different data streams on each interface. When a new interface is accessed or a certain interface is congested, the data flow is triggered.

In the prior art, multiple interfaces of the MN can access different MAGs through different networks, and are anchored to the same LMA. The LMA performs unified management on all interfaces of the MN and the MAGs accessed by these interfaces. The data stream movement function can implement switching on different interfaces in units of data streams. In the process of data stream movement, complex signaling interaction between the LMA and the MAG is required to realize the movement of the data stream, so that when the frequency occurs frequently When the data stream moves, the LMA and the different MAGs need to have more frequent and complex signaling interactions, and the network element devices LMA and MAG can only be applied to the proxy mobile IPv6 protocol. If the protocol is replaced, the network element device should be replaced accordingly. In turn, it causes huge waste in network construction.

Summary of the invention

The embodiment of the invention provides a data flow moving method, a network system and an SDN controller, which solves the problem that the network element device has a large number of signaling negotiation and interaction in the proxy mobile IPv6 protocol, and solves the problem due to the protocol change. The problem of wasted network construction caused by the replacement of network element equipment.

A first aspect of the embodiments of the present invention provides a software-defined network SDN controller, including: a first determining unit, configured to determine that a first data stream needs to be moved from a first interface of a mobile node MN to the MN a second interface, where the first interface corresponds to the first path of the first data stream, the second interface corresponds to the second path of the first data stream, and the mobile interface included in the second path is determined Whether the inbound MAG and the MAG included in the first path are the same device; a second determining unit, configured to determine, in the network element device of the second path, a network element device that needs to receive a flow entry adjustment message according to the determination result of the first determining unit;

a first sending unit, configured to send, to the network element device that is required to receive the flow entry adjustment message, by the second determining unit, the flow entry adjustment message, where the flow entry adjustment message is used to indicate that the first A data stream is moved from the first path to the second path.

With reference to the first aspect of the embodiments of the present invention, in a first implementation manner of the first aspect of the embodiments, the flow entry adjustment message is further used to indicate that the network element device adjusts according to the flow entry The content of the message adjusts the flow entry in the network element device.

With reference to the first embodiment of the first aspect of the embodiments of the present invention, in a second implementation manner of the first aspect of the embodiment, the second determining unit is specifically configured to: The MAG included in the first path is the same device as the MAG included in the second path, and when the same device is the first MAG, the first MAG is determined to be a network element device that needs to receive a flow entry adjustment message. ;

The first sending unit is configured to send a first flow entry adjustment message to the first MAG, where the first flow entry adjustment message is used to indicate that the first MAG adjusts a message according to the first flow entry. Modifying, by the content, the flow entry in the first MAG to the first flow entry;

The content of the first flow entry adjustment message includes: a first match: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: setting a next hop of the first data stream as the second interface.

With reference to the first embodiment of the first aspect of the embodiments of the present invention, in a third implementation manner of the first aspect of the embodiment, the second determining unit is specifically configured to: The MAG included in the first path is not the same device as the MAG included in the second path, where the first path includes the first MAG, and when the second path includes the second MAG, the local move is determined. The anchor point LMA and the second MAG are network element devices that need to receive the flow entry adjustment message;

The first sending unit includes:

a first sending subunit, configured to send a second flow entry adjustment message to the second MAG, where the second flow entry adjustment message is used to indicate that the second MAG adjusts the message according to the second flow entry Adding a second flow entry to the content;

a second sending subunit, configured to send a third flow entry adjustment message to the LMA, where the third flow entry adjustment message is used to indicate that the LMA adjusts the content of the message according to the third flow entry - - The flow entry in the LMA is modified to the third flow entry;

The content of the second flow entry adjustment message includes: a second matching item: the source address prefix is a communication address prefix of the first data stream; and the flow table operation: forwarding the first data stream from the LMA-second MAG tunnel interface; And the content of the second flow entry adjustment message further includes: a third matching pre-term: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: setting a next hop of the first data stream to the first Two interfaces;

The content of the third flow entry adjustment message includes: a fourth matching item: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: forwarding the first data stream from the LMA-second MAG tunnel interface.

With reference to the third embodiment of the first aspect of the embodiments of the present invention, in a fourth implementation manner of the first aspect of the embodiments, the first determining unit is further configured to: determine that the first data needs to be determined Before the flow moves from the first interface of the mobile node MN to the second interface of the MN, determining that the second MAG in the second path does not establish a tunnel with the LMA;

The SDN controller further includes:

a second sending unit, configured to send a first tunnel setup message to the LMA, where the first tunnel setup message is used to indicate that the LMA establishes the LMA side of a tunnel between the LMA and the second MAG The tunneling interface, the first tunnel establishment message includes: a tunnel configuration message that establishes a tunnel between the LMA and the second MAG;

a third sending unit, configured to send a second tunnel establishment message to the second MAG, where the second tunnel establishment message is used to indicate that the second MAG establishes a tunnel between the LMA and the second MAG The tunnel interface of the second MAG side, the second tunnel establishment message includes: a tunnel configuration message that establishes a tunnel between the LMA and the second MAG.

With reference to the third embodiment of the first aspect of the embodiment of the present invention or the fourth implementation manner of the first aspect, in the fifth implementation manner of the first aspect of the embodiment, the SDN controller further includes :

a third determining unit, configured to determine that the LMA and the second MAG adjust a flow entry; and an encapsulating unit, configured to encapsulate a communication address prefix of the first data flow in a router advertisement RA message;

And a fourth sending unit, configured to send the RA message to the MN by using the second MAG. A third embodiment of the first aspect of the embodiment of the invention, or a fourth embodiment of the first aspect In a sixth implementation manner of the first aspect, the first determining unit includes:

Obtaining a subunit, configured to acquire load information of the first MAG corresponding to the first interface, where the first determining subunit is configured to determine, according to the load information, that the load of the first MAG is greater than or equal to a preset load Value

The acquiring subunit is further configured to acquire load information of the MAG corresponding to the other interfaces of the MN;

The first determining unit further includes:

a sub-unit, configured to select the second MAG for the MN according to the load information of the MAG corresponding to the other interface acquired by the acquiring sub-unit and the location of the MN from the MAG corresponding to the other interface. The second MAG corresponds to the second interface.

With reference to the second embodiment of the first aspect of the embodiments of the present invention, in the seventh implementation manner of the first aspect of the embodiment, the first determining unit includes:

a second determining subunit, configured to determine that the second interface is in an open state;

a first receiving subunit, configured to receive a first bearer message sent by the first MAG, where the first bearer message includes identifier information of the second interface;

And a third determining subunit, configured to determine, according to the first bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

With reference to the third embodiment of the first aspect of the embodiment of the present invention, in the eighth implementation manner of the first aspect of the embodiment, the first determining unit includes:

a fourth determining subunit, configured to determine that the second interface is in an open state;

a second receiving subunit, configured to receive a second bearer message sent by the second MAG, where the second bearer message includes identifier information of the second interface;

And a fifth determining subunit, configured to determine, according to the second bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

With reference to the third embodiment of the first aspect of the embodiments of the present invention, in a ninth implementation manner of the first aspect of the embodiments, the first determining unit includes: a sixth determining subunit, configured to determine The MN turns on the second interface that is not turned on;

a third receiving subunit, configured to receive a third bearer message from the second MAG, where the third bearer message includes an L2 layer attach request of the MN; a seventh determining subunit, configured to determine, according to the third bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN;

Or,

a fourth receiving subunit, configured to: when the MN has more than two interfaces, receive a fourth bearer message from a MAG corresponding to an interface of the MN, where the fourth bearer message includes the MN L2 layer attachment request;

And an eighth determining subunit, configured to determine, according to the fourth bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

With reference to the second embodiment of the first aspect of the embodiment of the present invention, in the tenth implementation manner of the first aspect of the embodiment, the first determining unit includes:

a ninth determining subunit, configured to determine that the second interface that is not enabled by the MN is enabled; and a fifth receiving subunit, configured to receive a fifth bearer message from the first MAG;

a tenth determining subunit, configured to determine, according to the fifth bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN;

The fifth bearer message includes an L2 layer attach request of the MN, and the L2 layer attach request of the MN is used by the MN to request access to the first MAG by using the second interface.

A second aspect of the present invention provides a network system, where the system includes: a mobile node MN, a software custom network SDN controller, and at least one mobile access gateway MAG;

The SDN controller is configured to determine that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN, where the first interface corresponds to the first path of the first data stream, Determining, by the second interface, the second path of the first data stream, and determining whether the MAG included in the second path is the same device as the MAG included in the first path;

The SDN controller is further configured to: determine, according to the determination result, a network element device that needs to receive a flow entry adjustment message sent by the SDN controller in the network element device of the second path;

The SDN controller is further configured to send the flow entry adjustment message to the determined network element device that needs to receive a flow entry adjustment message, where the flow entry adjustment message is used to indicate that the first data is to be sent The flow moves from the first path to the second path.

With reference to the second aspect of the embodiments of the present invention, in a first implementation manner of the second aspect of the embodiment, the flow entry adjustment message is further used to indicate that the network element device adjusts according to the flow entry The content of the message adjusts the flow entry in the network element device. With the first embodiment of the second aspect of the embodiment of the present invention, in the second implementation of the second aspect of the embodiment, the at least one MAG includes the first MAG;

The SDN controller is specifically configured to: when the MAG included in the first path is the same device as the MAG included in the second path, where the same device is the first MAG, Determining that the first MAG is a network element device that needs to receive a flow entry adjustment message sent by the SDN controller;

The SDN controller is configured to send a first flow entry adjustment message to the first MAG, where the first flow entry adjustment message is used to instruct the first MAG to adjust the content of the message according to the first flow entry. Modifying the flow entry in the first MAG to the first flow entry, where the content of the first flow entry adjustment message includes: a first match: the destination address prefix is a communication address prefix of the first data flow; Table operation: Set the next hop of the first data stream to the second interface.

With reference to the first embodiment of the second aspect of the embodiments of the present invention, in a third implementation manner of the second aspect of the embodiments, the system further includes: a local mobility anchor point LMA, the at least one MAG The first MAG and the second MAG are included;

The SDN controller is specifically configured to: when the determining result is included in the first path

The MAG is not in the same device as the MAG included in the second path, where the first path includes the first MAG, and when the second path includes the second MAG, determining the LMA and the The second MAG is a network element device that needs to receive the flow entry adjustment message;

The SDN controller is configured to send a second flow entry adjustment message to the second MAG, and send a third flow entry adjustment message to the LMA, where the second flow entry adjustment message is used to indicate Adding, by the second MAG, the second flow entry according to the content of the second flow entry adjustment message;

The SDN controller is further configured to send a third flow entry adjustment message to the LMA, where the third flow entry adjustment message is used to indicate that the LMA adjusts the content of the message according to the third flow entry. The flow entry in the LMA is modified to a third flow entry;

The content of the second flow entry adjustment message includes: a second matching item: the source address prefix is a communication address prefix of the first data stream; and the flow table operation: forwarding the first data stream from the LMA-second MAG tunnel interface; And the content of the second flow entry adjustment message further includes: a third matching item: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: setting the next hop of the first data stream to the second Interface

The content of the third flow entry adjustment message includes: a fourth match: the destination address prefix is the first Communication address prefix of the data stream; flow table operation: Forwarding the first data stream from the LMA-second MAG tunnel interface.

With reference to the third embodiment of the second aspect of the embodiments of the present invention, in a fourth implementation manner of the second aspect of the embodiments, the SDN controller is further configured to determine that the first Determining that the second MAG and the LMA in the second path do not establish a tunnel before moving the data stream from the first interface of the MN to the second interface of the MN;

The SDN controller is further configured to send a first tunnel setup message to the LMA, where the first tunnel setup message is used to indicate that the LMA establishes a tunnel between the LMA and the second MAG. a tunnel interface on the LMA side, the first tunnel establishment message includes: a tunnel configuration message that establishes a tunnel between the LMA and the second MAG;

The SDN controller is further configured to send a second tunnel setup message to the second MAG, where the second tunnel setup message is used to indicate that the second MAG establishes between the LMA and the second MAG. The tunnel interface of the second MAG side of the tunnel, the second tunnel establishment message includes: a tunnel configuration message that establishes a tunnel between the LMA and the second MAG.

With reference to the third embodiment of the second aspect of the embodiment of the present invention, or the fourth implementation manner of the second aspect, in the fifth implementation manner of the second aspect of the embodiment of the present invention, the SDN controller, And after determining, by sending the flow entry adjustment message to the determined network element device, determining that the LMA and the second MAG adjust the flow entry, and prefixing the communication address of the first data flow. Encapsulated in the router advertisement RA message, the RA message is sent to the MN through the second MAG.

In combination with the third embodiment of the second aspect of the embodiment of the present invention, or the fourth embodiment of the second aspect, or the fifth embodiment of the second aspect, the sixth aspect of the second aspect of the embodiment of the present invention In an embodiment, the SDN controller is further configured to acquire load information of the first MAG corresponding to the first interface, and determine, according to the load information, that the load of the first MAG is greater than or equal to a preset load And obtaining the load information of the MAG corresponding to the other interface of the MN, and selecting, according to the acquired load information of the MAG corresponding to the other interface, the location of the MN, the MAG corresponding to the other interface from the MAG. In the second MAG, the second MAG corresponds to the second interface.

With reference to the second embodiment of the second aspect of the embodiment of the present invention, in a seventh implementation manner of the second aspect of the embodiment of the present invention, - the SDN controller is further configured to determine that the second interface is in an open state;

The SDN controller is further configured to receive a first bearer message sent by the first MAG, where the first bearer message includes identifier information of the second interface, and determining, according to the first bearer message, that the The first data stream moves from the first interface of the MN to the second interface of the MN.

With reference to the third embodiment of the second aspect of the embodiment of the present invention, in the eighth implementation manner of the second aspect of the embodiment of the present invention,

The SDN controller is further configured to determine that the second interface is in an open state;

The SDN controller is further configured to receive the second bearer message sent by the second MAG, where the second bearer message includes the identifier information of the second interface, and determine, according to the second bearer message, that the The first data stream is moved from the first interface of the MN to the second interface of the MN.

In conjunction with the third embodiment of the second aspect of the embodiment of the present invention, in a ninth embodiment of the second aspect of the embodiment of the present invention,

The SDN controller is further configured to: determine that the second interface that is not enabled by the MN is enabled; and the SDN controller is further configured to receive a third bearer message from the second MAG, where the third bearer is The message includes an L2 layer attach request of the MN, and determining, according to the third bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN; or when the MN When there are more than two interfaces, the SDN controller is further configured to: receive a fourth bearer message from a MAG corresponding to an interface of the MN, where the fourth bearer message includes an L2 layer attach request of the MN And determining, by the SDN controller, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN according to the fourth bearer message.

With reference to the second embodiment of the second aspect of the embodiment of the present invention, in the tenth embodiment of the second aspect of the embodiment of the present invention,

The SDN controller is further configured to: determine that the second interface that is not enabled by the MN is enabled; the SDN controller is further configured to receive a fifth bearer message from the first MAG, and according to the The five bearer message determines that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN;

A third aspect of the embodiments of the present invention provides another software-defined network SDN controller, including: a processor, configured to determine that a first data stream needs to be moved from a first interface of a mobile node MN to a a second interface of the MN, the first interface corresponds to a first path of the first data stream, the second interface corresponds to a second path of the first data stream, and the second path is determined Whether the included mobile access gateway MAG and the MAG included in the first path are the same device; determining, according to the determination result, the network element that needs to receive the flow entry adjustment message in the network element device of the second path a device, configured to send, by the network element device that needs to receive the flow entry adjustment message to the processor, the flow entry adjustment message, where the flow entry adjustment message is used to indicate that the first data is to be sent The flow moves from the first path to the second path.

With reference to the third aspect of the embodiments of the present invention, in a first implementation manner of the third aspect, the flow entry adjustment message is further used to indicate that the network element device adjusts a message according to the flow entry. The content adjusts the flow entry in the network element device.

A fourth aspect of the embodiments of the present invention provides a method for moving a data stream, where the method includes:

The SDN controller determines that the first data stream needs to be moved from the first interface of the mobile node MN to the second interface of the MN, the first interface corresponding to the first path of the first data stream, the second interface Corresponding to the second path of the first data stream, and determining whether the mobile access gateway MAG included in the second path is the same device as the MAG included in the first path;

Determining, by the SDN controller, the network element device that needs to receive the flow entry adjustment message sent by the SDN controller in the network element device of the second path according to the determination result;

The SDN controller sends the flow entry adjustment message to the determined network element device that needs to receive a flow entry adjustment message, where the flow entry adjustment message is used to indicate that the first data flow is from the The first path moves to the second path transmission.

With reference to the fourth aspect of the embodiments of the present invention, in a first implementation manner of the fourth aspect of the embodiments, the flow entry adjustment message is further used to indicate that the network element device adjusts according to the flow entry The content of the message adjusts the flow entry in the network element device.

With reference to the first embodiment of the fourth aspect of the embodiments of the present invention, in a second implementation manner of the fourth aspect of the embodiment, the SDN controller is in the network element of the second path according to the determination result. The determining, by the device, the network element device that needs to receive the flow entry adjustment message sent by the SDN controller includes:

If the result of the determination is that the MAG included in the first path is the same device as the MAG included in the second path, the same device is the first MAG, and the SDN controller determines that the first MAG is Receiving, by the SDN controller, a network element device that sends a flow entry adjustment message; - the SDN controller sends the flow entry adjustment message to the determined network element device that needs to receive the flow entry adjustment message, specifically:

The SDN controller sends a first flow entry adjustment message to the first MAG, where the first flow entry adjustment message is used to indicate that the first MAG adjusts the content of the message according to the first flow entry The flow entry in the MAG is modified to be the first flow entry.

With reference to the first embodiment of the fourth aspect of the embodiments of the present invention, in a third implementation manner of the fourth aspect of the embodiments of the present disclosure, the SDN controller is in the network element of the second path according to the determination result. The determining, by the device, the network element device that needs to receive the flow entry adjustment message sent by the SDN controller includes:

If the result of the determination is that the MAG included in the first path is not the same device as the MAG included in the second path, the first path includes a first MAG, and the second path includes a first path. a second MAG, wherein the SDN controller determines that the local mobility anchor point LMA and the second MAG are network element devices that need to receive the flow entry adjustment message;

And the sending, by the SDN controller, the flow entry adjustment message to the network element device that is required to receive the flow entry adjustment message includes:

The SDN controller sends a second flow entry adjustment message to the second MAG, where the second flow entry adjustment message is used to indicate that the second MAG adds the content of the second flow entry adjustment message. Second flow entry;

The SDN controller sends a third flow entry adjustment message to the LMA, where the third flow entry adjustment message is used to indicate that the LMA adjusts the content of the message according to the third flow entry to be in the LMA. The flow entry is modified to the third flow entry;

The content of the third flow entry adjustment message includes: a fourth matching item: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: connecting the first data stream from the LMA-second MAG tunnel - - Port forwarding.

With reference to the third embodiment of the fourth aspect of the embodiments of the present invention, in a fourth implementation manner of the fourth aspect of the embodiments of the present invention, the SDN controller determines that the first data stream needs to be from the MN Before the first interface is moved to the second interface of the MN, the method further includes:

The SDN controller determines that the second MAG does not establish a tunnel with the LMA; the SDN controller sends a first tunnel establishment message to the LMA, where the first tunnel establishment message is used to indicate the LMA establishment a tunnel interface of the LMA side of the tunnel between the LMA and the second MAG, where the first tunnel establishment message includes: a tunnel configuration message that establishes a tunnel between the LMA and the second MAG;

The SDN controller sends a second tunnel setup message to the second MAG, where the second tunnel setup message is used to indicate that the second MAG establishes a tunnel between the LMA and the second MAG. The tunnel interface of the second MAG, the second tunnel establishment message includes: a tunnel configuration message that establishes a tunnel between the LMA and the second MAG.

With reference to the third embodiment of the fourth aspect of the embodiment of the present invention, or the fourth implementation manner of the fourth aspect, in a fifth implementation manner of the fourth aspect of the embodiment of the present invention, the SDN controller After the determined network element device sends the flow entry adjustment message, the method further includes:

Determining, by the SDN controller, the LMA and the second MAG to adjust a flow entry; the SDN controller encapsulates a communication address prefix of the first data flow in a router advertisement RA message, and the RA A message is sent to the MN through the second MAG.

With reference to the third embodiment of the fourth aspect of the embodiment of the present invention, or the fourth embodiment of the fourth aspect, or the fifth embodiment of the fourth aspect, the sixth aspect of the fourth aspect of the embodiment of the present invention In an embodiment, the determining, by the SDN controller, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN includes:

The SDN controller acquires load information of the first MAG corresponding to the first interface, and the SDN controller determines, according to the load information, that the load of the first MAG is greater than or equal to a preset load threshold;

The SDN controller acquires load information of the MAG corresponding to the other interfaces of the MN, and according to the acquired load information of the MAG corresponding to the other interfaces, and the location of the MN is from the MAG corresponding to the other interfaces. The MN selects the second MAG, and the second MAG corresponds to the second interface. In conjunction with the second embodiment of the fourth aspect of the embodiments of the present invention, in a seventh implementation manner of the fourth aspect of the embodiments of the present invention, the SDN controller determines that the first data stream needs to be from the The moving the first interface of the MN to the second interface of the MN specifically includes:

The SDN controller determines that the second interface is in an open state;

Receiving, by the SDN controller, the first bearer message sent by the first MAG, where the first bearer message includes the identifier information of the second interface;

The SDN controller determines, based on the first bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

With reference to the third embodiment of the fourth aspect of the embodiments of the present invention, in an eighth implementation manner of the fourth aspect of the embodiments of the present invention, the SDN controller determines that the first data stream needs to be from the MN The moving the first interface to the second interface of the MN specifically includes:

The SDN controller determines that the second interface is in an open state;

The SDN controller receives the second bearer message sent by the second MAG, where the second bearer message includes the identifier information of the second interface;

The SDN controller determines, based on the second bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

With reference to the third embodiment of the fourth aspect of the embodiments of the present invention, in a ninth implementation manner of the fourth aspect of the embodiments of the present invention, the SDN controller determines that the first data stream needs to be from the MN The moving the first interface to the second interface of the MN specifically includes:

Determining, by the SDN controller, that the MN opens the second interface that is not enabled; the SDN controller receives a third bearer message from the second MAG, where the third bearer message includes the L2 of the MN a layer attach request, and determining, according to the third bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN; or

When the MN has more than two interfaces, the SDN controller receives a fourth bearer message from the MAG corresponding to an interface of the MN, where the fourth bearer message includes the L2 layer attach request of the MN. And determining, by the SDN controller, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN according to the fourth bearer message.

With reference to the second embodiment of the fourth aspect of the embodiments of the present invention, in a tenth implementation manner of the fourth aspect of the embodiments of the present invention, the SDN controller determines that the first data stream needs to be the first one from the MN. The second interface of the interface moving to the MN specifically includes: - the SDN controller determines that the MN opens the second interface that is not turned on;

Receiving, by the SDN controller, a fifth bearer message from the first MAG, and determining, according to the fifth bearer message, that the first data stream is moved from the first interface of the MN to the second interface of the MN; The fifth bearer message includes an L2 layer attach request of the MN, and the L2 layer attach request of the MN is used to request access to the first MAG by using the second interface.

As can be seen from the above technical solutions, the embodiments of the present invention have the following advantages:

In the embodiment of the present invention, the SDN controller includes: a first determining unit, configured to determine that the first data stream needs to be moved from the first interface of the mobile node MN to the second interface of the MN, where the first interface corresponds to the first interface a path, the second interface corresponding to the second path, and determining whether the mobile access gateway MAG included in the second path is the same device as the MAG included in the first path; Determining, in the network element device of the second path, the network element device that needs to receive the flow entry adjustment message according to the determination result of the first determining unit; the first sending unit, configured to determine, by the second determining unit The network element device that needs to receive the flow entry adjustment message sends the flow entry adjustment message to move the first data flow from the first path to the second path, where the flow entry The adjustment message is used to instruct the network element device to adjust the flow entry in the network element device according to the content of the flow entry adjustment message, so that the network element device does not need to negotiate, and Compared with the technology, in the process of data stream movement, the network element devices LMA and MAG can operate according to the SDN controller instructions, so that the network element devices LMA and MAG can be applied to any Internet Protocol (IP, Internet Protocol), and then in the network. The cost is saved during construction.

DRAWINGS

1 is a schematic diagram of an embodiment of an SDN controller according to an embodiment of the present invention;

2 is a schematic diagram of another embodiment of an SDN controller according to an embodiment of the present invention;

3 is a schematic diagram of data flow when there is only one MAG in the embodiment of the present invention;

4 is a schematic diagram of another embodiment of an SDN controller according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of data flow movement when there are multiple MAGs in an embodiment of the present invention; FIG.

6 is a schematic diagram of another embodiment of an SDN controller according to an embodiment of the present invention;

7 is a schematic diagram of an embodiment of a network system according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of signaling interaction between each network element and a network in a network system according to an embodiment of the present invention; FIG. 9 is a schematic diagram of signaling interaction between each network element and a network in a network system according to an embodiment of the present invention; Schematic diagram of signaling interaction between each network element and network in a network system in an embodiment of the invention - -

11 is a schematic diagram of signaling interaction between each network element and a network in a network system according to an embodiment of the present invention; FIG. 12 is a schematic diagram of an embodiment of an SDN controller according to an embodiment of the present invention;

13 is a schematic diagram of an embodiment of a method for moving a data stream according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of another embodiment of a method for moving a data stream according to an embodiment of the present invention; FIG.

FIG. 15 is a schematic diagram of another embodiment of a method for moving a data stream according to an embodiment of the present invention; FIG.

16 is a schematic diagram of another embodiment of a method for moving a data stream according to an embodiment of the present invention;

FIG. 17 is a schematic diagram of another embodiment of a method for moving a data stream according to an embodiment of the present invention.

detailed description

The embodiment of the invention provides a data stream moving method, a network system and an SDN controller, which do not need to negotiate between network element devices, and compared with the prior art, in the data stream moving process, the network element devices LMA and MAG It can be operated according to the SDN controller instructions, so that the network element devices LMA and MAG can be applied to any IP protocol, thereby saving costs in network construction.

It should be noted that, in the embodiment of the present invention, different communication address prefixes are used as an example for different data streams, that is, initially, the LMA allocates different communication address prefixes for different data streams.

Referring to FIG. 1, FIG. 1 is an embodiment of a software defined network (SDN) controller according to an embodiment of the present invention. The SDN controller includes: a first determining unit 101, a second determining unit 102, and a first Transmitting unit 103;

The first determining unit 101 is configured to determine that the first data stream needs to be moved from the first interface of the mobile node MN to the second interface of the MN, where the first interface corresponds to the first path of the first data stream, and the second interface corresponds to the first interface a second path of the data stream, and determining whether the mobile access gateway MAG included in the second path is the same device as the MAG included in the first path; the first path and the second path in the embodiment are both A flow path from the MN to the LMA.

The second determining unit 102 is configured to determine, according to the determination result of the first determining unit 101, the network element device that needs to receive the flow entry adjustment message in the network element device of the second path.

The first sending unit 103 is configured to send the flow entry adjustment message to the network element device determined by the second determining unit 102, where the flow entry adjustment message is used to indicate that the first data flow is moved from the first path to the second Path transfer.

In this embodiment, the SDN controller determines, by using the first determining unit, the included in the second path. - -

Whether the MAG and the MAG included in the first path are the same device, and the second determining unit determines, according to the judgment result of the first determining unit, the network element that needs to receive the flow entry adjustment message in the network element device of the second path. The device, the first sending unit sends the flow entry adjustment message to the determined network element device, so as to move the first data stream to the second path for transmission, so that data flow between the network element devices is not required. Negotiation, and compared with the prior art, the network element device MAG can operate according to the SDN controller command, so that the network element device MAG can be applied to any IP protocol, thereby saving cost in network construction.

For a better understanding of the above embodiments, the interaction of the various units and components included in the SDN controller to the data interaction mode in the SDN controller will be described below with reference to FIG. 2, FIG. 2 The structure of the SDN controller when there is only one MAG device in the network and the MAG device is the first MAG.

First, the structure of the SDN controller when the second interface of the MN is in an open state is determined. The SDN controller includes: a first determining unit 201, a second determining unit 202, and a first sending unit. 203;

The first determining unit 201 includes: a second determining subunit 2011, a first receiving subunit 2012, and a third determining subunit 2013, specifically:

Before determining that the first data stream needs to be moved from the first interface of the mobile node MN to the second interface of the MN, the second determining subunit 2011 determines that the second interface is in an enabled state, and the first receiving subunit 2012 receives a first bearer message sent by the first MAG, where the first bearer message includes the identifier information of the second interface, where the identifier information is, for example, a name, a number, and the like of the second interface, and the third determining subunit 2013 receives the information according to the first receiving unit 2012. The first bearer message to arrive determines that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

The following is a practical application scenario. For example, as shown in FIG. 3, initially, the MN transmits the data stream X to the first MAG through the interface 1, and then sends it to the LMA via the first MAG. When the SDN controller determines that the data stream X needs to be transmitted by using the interface 2, the first MAG may send a first bearer message to the SDN controller, where the first bearer message is used to notify the identifier information of the SDN controller interface 2, and the SDN controller according to the A bearer message determines that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN. In the actual application, the MN does not need to register with the second interface to the network, so the MN can directly send the first data stream to the first MAG through the second interface. - In the initial state, the first MAG includes a flow entry of the first data flow, and the first MAG may be based on the first data flow from the interface of the MN to the first MAG. The flow entry of the data flow forwards the first data flow to the LMA, so when the first MAG sends the first bearer message to the SDN controller, the first MAG may forward the first data stream received from the second interface to The LMA, of course, may also send the first data stream to the LMA after receiving the first flow entry adjustment message.

In this embodiment, since there is only one MAG device in the network, the first determining unit 201 determines that the MAG included in the second path is the same device as the MAG included in the first path, and the same device For the first MAG, the second determining unit 202 determines that the first MAG is a network element device that needs to receive a flow entry adjustment message, and the first sending unit 203 sends the first flow entry adjustment message to the first MAG.

The first flow entry adjustment message is used to indicate that the first MAG modifies the flow entry in the first MAG to the first flow entry according to the content of the first flow entry adjustment message, where the content of the first flow entry adjustment message includes: A matching entry: the destination address prefix is the communication address prefix of the first data stream; the flow table operation corresponding to the first matching item: setting the next hop of the first data stream in the flow entry to the second interface.

In this embodiment, when there is only one MAG, the first determining unit determines whether the MAG included in the second path is the same device as the MAG included in the first path, and the second determining unit determines the The first MAG is a network element device that needs to send a flow entry adjustment message, and then the first sending unit sends a first flow entry adjustment message to the first MAG, so that negotiation of data flow between the network element devices is not required, and Compared with the prior art, the network element device MAG can operate according to the SDN controller command, so that the network element device MAG can be applied to any IP protocol, thereby saving cost in network construction.

The following describes the structure of the SDN controller when there is only one MAG device in the network, the MAG is the first MAG, and the second interface is not open before the first data flow moves, and the SDN controller includes: A determining unit 201, a second determining unit 202, and a first transmitting unit 203.

The first determining unit 201 includes: a ninth determining subunit 2014, a fifth receiving subunit 2015, and a tenth determining subunit 2016, specifically:

The ninth determining sub-unit 2014 determines that the MN opens the second interface that is not enabled, the MN sends an L2 layer attach request to the first MAG, and the MN accesses the second interface to the first MAG by using the L2 layer attach request, the first MAG. After receiving the L2 layer attach request, sending the fifth bearer cancellation to the SDN controller The fifth receiving subunit 2015 receives a fifth bearer message from the first MAG, where the fifth bearer message includes an L2 layer attach request of the MN, and then the tenth determining subunit 2016 is according to the fifth receiving subunit 2015. The received fifth bearer message determines that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

In this embodiment, since there is only one MAG device in the network, the first determining unit 201 determines that the MAG included in the second path is the same device as the MAG included in the first path, and the same device is The first determining unit 202 determines that the first MAG is a network element device that needs to send a flow entry adjustment message, and the first sending unit 203 sends the first flow entry adjustment message to the first MAG.

It should be noted that, since there is only one MAG in this embodiment, that is, the first MAG, the initial state, the MN transmits the first data stream to the LMA through the first MAG through the first interface, where the first MAG and the LMA are The tunnel has been established. When the first data stream is switched from the first interface of the MN to the second interface, the tunnel does not change, and the MN has learned the network address prefix corresponding to the first data stream in the initial state, so there is no need to The tunnel is re-established and the SDN controller does not need to reconfigure the communication address prefix for the MN.

In this embodiment, when there is only one MAG, the first determining unit determines whether the MAG included in the second path is the same device as the MAG included in the first path, and the second determining unit determines the first according to the determination result. A MAG is a network element device that needs to send a flow entry adjustment message, and then the first sending unit sends a first flow entry adjustment message to the first MAG, so that negotiation of data flow between the network element devices is not required, and Compared with the technology, the network element device MAG can operate according to the SDN controller command, so that the network element device MAG can be applied to any IP protocol, thereby saving costs in network construction.

Referring to FIG. 4, FIG. 4 is another embodiment of an SDN controller according to an embodiment of the present invention. FIG. 4 shows a structure of an SDN controller when there are multiple MAG devices in the network, where the multiple MAG devices include First MAG, second MAG.

This embodiment mainly introduces the SDN control when the data flow is triggered due to the load overload of the first MAG. - The structure of the controller, the SDN controller includes: a first determining unit 401, a second determining unit 402, and a first sending unit 403;

The first determining unit 401 includes: an obtaining subunit 4011, a first determining subunit 4012, and a selecting subunit 4013, specifically:

The obtaining sub-unit 4011 is configured to obtain load information of the first MAG corresponding to the first interface, where the load information may be the number of interfaces of the MN that receives the first MAG, and the more the number of interfaces that the MAG accesses the MN, the load is The bigger.

The first determining sub-unit 4012 is configured to determine a load of the first MAG according to the load information acquired by the obtaining sub-unit 4011. When the load of the first MAG is greater than or equal to a preset load threshold, the triggering obtaining sub-unit 4011 obtains The load information of the MAG corresponding to other interfaces of the MN.

The selecting sub-unit 4013 is configured to select, according to the acquiring sub-unit 4011, the load information of the MAG corresponding to the other interface of the MN and the location of the MN, select another MAG for the MN from the MAG corresponding to the other interface, and the other MAG may be the load less than the preset. In this embodiment, the other MAG is the second MAG, and the second MAG corresponds to the second interface.

At this time, the second interface may be in the open state or the unopened state. Here, the second interface is mainly turned on. The first determining unit 401 further includes: a fourth determining subunit 4014, a second receiving subunit 4015, and a fifth determining subunit 4016, specifically:

a fourth determining unit 4014, configured to determine that the second interface is in an open state;

The second receiving sub-unit 4015 is configured to receive a second bearer message sent by the second MAG, where the second bearer message includes the identifier information of the second interface.

The fifth determining subunit 4016 determines that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN according to the second bearer message received by the second receiving subunit 4015.

The following is an example. For example, as shown in FIG. 5, initially, the MN outputs the data stream X and the data stream Y to the first MAG through the interface 1, and then the first MAG outputs the data stream X and the data stream Y to the LMA, LMA. The communication address prefix assigned to data stream X is prefl, and the communication address prefix assigned to data stream Y is pref2. A flow entry for forwarding the data flow X and the data flow Y is stored in the first MAG, and the flow entry corresponding to the data flow X has a communication address prefix of prefl, and the flow entry corresponding to the flow entry Y has a communication address. The prefix is pref2.

At a certain moment, the SDN controller acquires load information of the first MAG, when determining the first MAG - When the load information is greater than or equal to the preset load threshold, it is determined that the data stream Y needs to be interfaced. The SDN controller obtains the load information of the MAG corresponding to the other interfaces of the MN, and obtains the MAG with the lightest load or the load less than the load threshold as the second MAG according to the location of the MN, and the second MAG corresponds to the interface 2, so that the SDN control The device determines that the data stream Y needs to be transferred from interface 1 to interface 2. Since the interface 2 is in the open state, the MN does not need to register to the network through the interface 2, and the second MAG directly sends the first bearer message to the SDN controller, where the first bearer message includes the identifier information of the second interface, such that the SDN control The device determines that the data stream Y needs to be transferred to the second interface.

Since there are multiple MAG devices in the network in this embodiment, after determining that the first data stream needs to be transferred from the first interface of the MN to the second interface of the MN, the first determining unit 401 further needs to determine the information included in the second path. Whether the MAG and the MAG included in the first path are the same device, and the determination result in the embodiment is no, that is, the first path includes the first MAG, the second path includes the second MAG, and the second determining unit 402 determines the local The mobile anchor point LMA and the second MAG are network element devices that need to receive a flow entry adjustment message.

The first sending unit 403 sends a flow entry adjustment message to the network element device that needs to receive the flow entry adjustment message. In this embodiment, the first sending unit 403 specifically includes: a first sending subunit 4031 and a second sending subunit 4032 , among them:

The first sending sub-unit 4031 is configured to send a second flow entry adjustment message to the second MAG, where the second flow entry adjustment message is used to indicate that the second MAG adds the second flow table according to the content of the second flow entry adjustment message. item. The content of the second flow entry adjustment message includes: a second match: the source address prefix is a communication address prefix of the first data stream; the flow table operation: forwarding the first data stream from the LMA-second MAG tunnel interface; The content of the second-flow entry adjustment message further includes: a third matching pre-term: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: setting a next hop of the first data stream as the second interface.

The second sending sub-unit 4032 is configured to send a third flow entry adjustment message to the LMA, where the third flow entry adjustment message is used to instruct the LMA to modify the flow entry in the LMA according to the content of the third flow entry adjustment message to The third flow entry, the third flow entry adjustment message includes: a fourth match: the destination address prefix is a communication address prefix of the first data flow; and the flow table operation: the first data flow is from the LMA-second MAG Tunnel interface forwarding.

In addition, the SDN controller may further include a third determining unit 404, a packaging unit 405, and a fourth sending - - Send unit 406, where:

The third determining unit 404 is configured to: after the first sending sub-unit 4031 sends the second flow entry adjustment message to the second MAG, and the second sending sub-unit 4032 sends the third flow entry adjustment message to the LMA, determine the LMA and the first The second MAG adjusts the flow entry.

The encapsulating unit 405 is configured to encapsulate the communication address prefix of the first data stream in the router advertisement RA message.

The fourth sending unit 406 is configured to send the RA message to the MN through the second MAG.

In this embodiment, after the first data stream is transferred from the first path to the second path, the used communication address prefix remains unchanged.

In this embodiment, when there are multiple MAGs, the selecting subunit may select the second MAG for the MN by using the load state information of the MAG and the location of the MN, and then the second determining unit determines that the LMA and the second MAG in the second path are The network element device that needs to send the flow entry adjustment message, and sends a second flow entry adjustment message to the second MAG by using the first sending subunit, and the second sending subunit sends a third flow entry adjustment message to the LMA. The first data stream is sent from the second interface of the MN to the LMA via the second MAG, so that the negotiation of the data flow movement between the network element devices is not required, and compared with the prior art, the network element device MAG can be based on the SDN controller. The instruction operates, so that the network element device MAG can be applied to any IP protocol, thereby saving costs in network construction.

The above describes the structure of the SDN controller when there are multiple MAG devices in the network, and the load of the first MAG triggers the movement of the data stream. The following describes how there are multiple MAG devices in the network. For the structure of the SDN controller when the data stream moves, please refer to FIG. 6. The SDN controller in FIG. 6 includes: a first determining unit 601, a second determining unit 602, a second sending unit 603, a third sending unit 604, and The first transmitting unit 605.

The first determining unit 601 includes a sixth determining subunit 6011, a third receiving subunit 6012, and a seventh determining subunit 6013, or the first determining unit 601 includes a sixth determining subunit 6011 and a fourth receiving subunit. 6014 and an eighth determining subunit 6015.

The first transmitting unit 605 includes a first transmitting subunit 6051 and a second transmitting subunit 6052. The sixth determining sub-unit 6011 determines that the MN opens the second interface that is not enabled. Since the second interface of the MN is a newly opened interface and does not access the network, the MN needs to send the L2 layer attach request of the MN to the second MAG. The second interface is connected to the second MAG by using the L2 layer attach request, and the second MAG sends the third bearer to the SDN controller after receiving the L2 layer attach request sent by the MN. - - Message.

The third receiving sub-unit 6012 receives the third bearer message sent by the second MAG, where the third bearer message includes the L2 layer attach request of the MN, and the seventh determining sub-unit 6013 receives the third bearer message according to the third receiving sub-unit 6012. Determining that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

The above is an example in which the MN has two interfaces. When the MN has more than two interfaces, the sixth determining subunit 6011 determines that the MN opens the second interface that is not enabled, and the fourth receiving subunit 6014 can be from the MN. The fourth bearer message is received in the MAG corresponding to any one of the interfaces, the fourth bearer message includes the L2 layer attach request of the MN, and the eighth determining subunit 6015 receives the fourth bearer message according to the fourth receiving subunit 4019. Determining that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

In this embodiment, there are multiple MAG devices in the network. Therefore, after the first determining unit 601 determines that the first data stream needs to be transferred from the first interface of the MN to the second interface of the MN, it is also required to determine the second path included. Whether the MAG and the MAG included in the first path are the same device, and the determination result in the embodiment is no, that is, the first path includes the first MAG, the second path includes the second MAG, and the second determining unit 602 determines the local The mobile anchor point LMA and the second MAG are network element devices that need to receive a flow entry adjustment message.

Since the second interface of the MN is a newly opened interface, and no tunnel is established between the LMA and the second MAG, the second determining unit 602 determines that the local mobility anchor point LMA and the second MAG are networks that need to receive the flow entry adjustment message. After the meta-device, a tunnel between the LMA and the second MAG needs to be established, specifically:

The second tunneling unit 603 sends a first tunnel setup message to the LMA, where the first tunnel setup message is used to indicate that the LMA establishes a tunnel interface on the LMA side of the tunnel between the LMA and the second MAG, where the first tunnel setup message includes: Establishing a tunnel configuration message of the tunnel between the LMA and the second MAG; sending, by the third sending unit 604, a second tunnel setup message to the second MAG, where the second tunnel setup message is used to indicate that the second MAG establishes the LMA and the second MAG. The tunnel interface of the second MAG side of the tunnel, the second tunnel setup message includes: a tunnel configuration message that establishes a tunnel between the LMA and the second MAG.

After the tunnel is established between the LMA and the second MAG, the first sending sub-unit 6051 in the first sending unit 605 sends a second flow entry adjustment message to the second MAG, where the second flow entry is adjusted. The message is used to instruct the second MAG to add the second flow entry according to the content of the second flow entry adjustment message. The content of the second flow entry adjustment message includes: a second match: the source address prefix is a communication address prefix of the first data stream; the flow table operation: forwarding the first data stream from the LMA-second MAG tunnel interface; The content of the second-flow entry adjustment message further includes: a third matching pre-term: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: setting a next hop of the first data stream as the second interface.

The third flow entry adjustment message is sent to the LMA by the second sending sub-unit 6052, and the third flow entry adjustment message is used to instruct the LMA to modify the flow entry in the LMA according to the content of the third flow entry adjustment message. The third flow entry, the third flow entry adjustment message includes: a fourth match: the destination address prefix is a communication address prefix of the first data flow; and the flow table operation: the first data flow from the LMA-second MAG tunnel Interface forwarding.

In addition, the SDN controller in this embodiment may further include a third determining unit 606, a packaging unit 607, and a fourth sending unit 608, where:

The third determining unit 606 is configured to: after the first sending sub-unit 6051 sends the second flow entry adjustment message to the second MAG, and the second sending sub-unit 6052 sends the third flow entry adjustment message to the LMA, determine the LMA and the first The second MAG adjusts the flow entry.

The encapsulating unit 607 is configured to encapsulate the communication address prefix of the first data stream in the router advertisement RA message.

The fourth sending unit 608 is configured to send the RA message to the MN through the second MAG.

In this embodiment, when there are multiple MAGs, after the second determining unit determines that the LMA and the second MAG in the second path are the network element devices that need to send the flow entry adjustment message, the second sending unit sends the LMA to the LMA. a first tunnel establishment message, the third sending unit sends a second tunnel establishment message to the second MAG, so as to establish a tunnel between the LMA and the second MAG, and then send the second flow table to the second MAG by using the first sending subunit. Transmitting the message, and sending the second flow entry adjustment message to the second MAG by using the second sending subunit, so that the first data stream is sent from the second interface to the LMA via the second MAG, so that no need is performed between the network element devices. Compared with the prior art, the network element device MAG can operate according to the SDN controller command, so that the network element device MAG can be applied to any IP protocol, thereby saving cost in network construction.

Referring to FIG. 7, FIG. 7 is a schematic diagram of an embodiment of a network system according to an embodiment of the present invention. - - including: SDN controller 11, MN 12, at least one MAG 13;

The SDN controller 11 is used to perform the following processes:

Determining that the first data stream needs to be moved from the first interface of the MN 12 to the second interface of the MN 12, the first interface corresponds to the first path of the first data stream, and the second interface corresponds to the second path of the first data stream And determining whether the MAG included in the second path is the same device as the MAG included in the first path;

Determining, in the network element device of the second path, the network element device that needs to receive the flow entry adjustment message according to the judgment result;

And sending, by the network element device that needs to receive the flow entry adjustment message, the flow entry adjustment message, where the flow entry adjustment message is used to indicate that the first data flow is moved from the first path to the second path.

In addition, the flow entry adjustment message is further used to instruct the network element device to adjust the flow entry in the network element device according to the content of the flow entry adjustment message.

In this embodiment, the SDN controller may determine whether the MAG included in the second path is the same device as the MAG included in the first path, and the second path is determined according to the judgment result. Determining, by the network element device, the network element device that needs to receive the flow entry adjustment message, and then sending the flow entry adjustment message to the determined network element device, so as to implement moving the first data flow from the first path to the second path Therefore, the network element device does not need to negotiate between the network element devices, and the signaling interaction between the network element devices is reduced during the data stream moving process, so that the network element device can be applied to any IP protocol, and thus Save costs in network construction.

The following describes an embodiment of the signaling interaction process between the network element devices in the network system of the present invention. Referring to FIG. 8, in this embodiment, the network system includes: an SDN controller 11, an MN 12, and a first MAG 131. The second interface of the MN 12 is in an open state.

It should be noted that the first MAG 131 belongs to at least one MAG 13 in the foregoing embodiment.

801. The first MAG 131 sends a first bearer message to the SDN controller 11, where the first bearer message includes the identifier information of the second interface.

802. The SDN controller 11 determines, according to the received first bearer message, that the first data stream needs to be moved from the first interface of the MN 12 to the second interface of the MN 12, where the first interface corresponds to the first data stream. a path, where the second interface corresponds to the second path of the first data stream;

803. The SDN controller 11 determines whether the MAG included in the second path is the same device as the MAG included in the first path. - -

804. When the SDN controller 11 determines that the MAG included in the first path is the same device as the MAG included in the second path, and the same MAG is the first MAG 131, determining that the first MAG 131 is a required flow table. The NE device of the item adjustment message;

805. The SDN controller 11 sends a first flow entry adjustment message to the first MAG 131.

806. The first MAG 131 modifies the flow entry of the first flow entry to the first flow entry according to the received first flow entry adjustment message, where the content of the first flow entry adjustment message includes: the first match: the destination address prefix is The communication address prefix of the first data stream; the flow table operation corresponding to the first matching item: setting the next hop of the first data stream in the flow entry to the second interface.

In this embodiment, when there is only one MAG, the SDN controller 11 determines whether the MAG included in the second path is the same device as the MAG included in the first path, and determines that the first MAG 131 is determined according to the determination result. The network element device that needs to receive the flow entry adjustment message, the SDN controller 11 sends a first flow entry adjustment message to the first MAG 131, and the first MAG 131 adjusts the flow entry stored by the first flow entry according to the received first flow entry. The network element device MAG can be operated according to the SDN controller command, so that the network element device MAG can be applied to the network element device MAG. In any IP protocol, the cost is saved in the network construction.

The following describes another embodiment of the signaling interaction process between the network element devices in the network system of the present invention. Referring to FIG. 9, the network system includes: an SDN controller 11, an MN 12, a first MAG 131, and at the first Before the data stream moves, the second interface of the MN 12 is not turned on.

901. The MN 12 starts the second interface, and sends an L2 layer attach request to the first MAG 131. The 902, the first MAG 131 carries the L2 layer attach request in the fifth bearer message, and the fifth bearer message is sent. Sending to the SDN controller 11, the MN12 sends the L2 layer attach request to the first MAG, the second interface is connected to the first MAG 131 by the L2 layer attach request;

903. The SDN controller 11 determines, according to the fifth bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

904. The SDN controller 11 determines whether the MAG included in the second path is the same device as the MAG included in the first path.

905. The SDN controller 11 determines that the MAG included in the first path is the same device as the MAG included in the second path, and the same device is the first MAG 131. - -

The MAG131 is a network element device that needs to send a flow entry adjustment message.

906. The SDN controller 11 sends a first flow entry adjustment message to the first MAG 131.

907. The first MAG 131 modifies the flow entry of the first flow entry to the first flow entry according to the received first flow entry adjustment message, where the content of the first flow entry adjustment message includes: the first match: the destination address prefix The communication address prefix of the first data stream; the flow table operation corresponding to the first matching item: setting the next hop of the first data stream in the flow entry to the second interface.

In this embodiment, when there is only one MAG in the network system, the SDN controller 11 determines whether the MAG included in the second path is the same device as the MAG included in the first path, and determines the first according to the determination result. A MAG is a network element device that needs to receive a flow entry adjustment message, and then sends a first flow entry adjustment message to the first MAG, where the first MAG 131 adjusts the flow table according to the received first flow entry adjustment message. The item is modified to be the first flow entry, so that the negotiation of the data flow between the network element devices is not required, and the network element device MAG can be compared according to the prior art.

The SDN controller commands the operation, so that the network element device MAG can be applied to any IP protocol, thereby saving costs in network construction.

The following describes another embodiment of the signaling interaction process between the network element devices in the network system in this embodiment. Referring to FIG. 10, the network system includes: SDN controller 11, MN 12, and second MAG.

132 and third MAG 133, LMA 14.

It should be noted that the second MAG 132 and the third MAG 133 belong to at least one MAG 13 in the foregoing embodiment. This embodiment mainly describes the movement of the trigger data stream when the first MAG load is overloaded.

1001. The SDN controller 11 acquires load information of the first MAG corresponding to the first interface.

The SDN controller 11 then determines that the load of the first MAG is greater than or equal to the preset load threshold according to the obtained load information, and the SDN controller acquires the load information of the MAG corresponding to the other interfaces of the MN, according to the acquired MN. The load information of the MAG corresponding to the other interfaces and the location of the MN selects the second MAG for the MN from the MAG corresponding to the other interface, the second MAG corresponds to the second interface, and the second MAG can be the load with less than the preset load in all the MAGs. a wide value MAG or a least loaded MAG;

1003. The second MAG 132 sends the second bearer message to the SDN controller, where the second bearer message includes the identifier information of the second interface.

1004. The SDN controller 11 determines the first data stream according to the received second bearer message. - - Moving from the first interface of the MN 12 to the second interface of the MN 12.

1005. The SDN controller 11 determines whether the MAG included in the second path is the same device as the MAG included in the first path.

1006. If the result of the determination is that the MAG included in the first path is not the same device as the MAG included in the second path, the SDN controller 11 determines that the LMA 14 and the second MAG 132 in the second path need to receive the flow entry. Adjusting the NE device of the message;

1007, the SDN controller 11 sends a second flow entry adjustment message to the second MAG 132, where the content of the second flow entry adjustment message includes: a second match: the source address prefix is a communication address prefix of the first data stream; The flow table operation corresponding to the second matching item: forwarding the first data flow in the flow entry from the LMA-second MAG tunnel interface; and the content of the second flow entry adjustment message further includes: a third match: The destination address prefix is a communication address prefix of the first data stream; the flow table operation corresponding to the third matching item is: setting a next hop of the first data stream in the flow entry to the second interface;

1008. The second MAG 132 adds the second flow entry according to the received second flow entry adjustment message.

1009, the SDN controller 11 sends a third flow entry adjustment message to the LMA 14, the content of the third flow entry adjustment message includes: a fourth match: the destination address prefix is a communication address prefix of the first data stream; The flow table operation corresponding to the four matches: forwarding the first data flow in the flow entry from the LMA-second MAG tunnel interface;

1010. The LMA 14 modifies the flow entry stored by the LMA to the third flow entry according to the received third flow entry adjustment message.

In this embodiment, when there are multiple MAGs, the SDN controller 11 can select the second MAG 132 for the MN through the load information of the MAG and the location of the MN, and receive the second bearer message from the second MAG, and the SDN controller 11 The second bearer message determines that the first data stream moves from the first interface of the MN 12 to the second interface of the MN 12, and then the SDN controller 11 determines that the LMA 14 and the second MAG 132 in the second path need to receive the flow table. The network element device of the item adjustment message sends a second flow entry adjustment message to the second MAG 132, and sends a third flow entry adjustment message to the LMA 14, so that the first data flow is sent from the second interface of the MN to the second MAG. Sending to the LMA, the second MAG 132 adds the second flow entry according to the received second flow entry adjustment message, and the LMA 14 modifies the flow entry stored by itself according to the received third flow entry adjustment message. For the third flow entry, the negotiation of the data flow between the network element devices is not required, and the network element device MAG can be compared with the prior art. - - Operate according to the SDN controller instructions, so that the network element device MAG can be applied to any IP protocol, thereby saving costs in network construction.

The following describes another embodiment of the signaling interaction process between the network element devices in the network system of the present invention. Referring to FIG. 11, the network system includes: SDN controller 11, MN 12, second MAG 132, LMA 14, and initial The second interface of the MN 12 is in an unopened state. This embodiment is mainly described by taking the movement of the second interface to enable the trigger data flow by the MN.

It should be noted that the second MAG 132 belongs to at least one MAG 13 in the foregoing embodiment. 1101, MN 12 opens the second interface, and sends an L2 layer attach request to the second MAG 132 through the second interface;

The first MAG 132 carries the L2 layer attach request in the third bearer message, and sends the third bearer message to the SDN controller 11;

1103. The SDN controller 11 determines, according to the received third bearer message, that the first data stream is moved from the first interface of the MN 12 to the second interface of the MN 12.

In addition, when the MN 12 has more than two interfaces, the SDN controller may also receive the fourth bearer message by using the MAG corresponding to any one of the interfaces, where the fourth bearer message includes the L2 layer attach request; It is determined that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

1104. The SDN controller 11 determines whether the MAG included in the second path is the same device as the MAG included in the path.

1105. When the judgment result is that the MAG included in the first path is not the same device as the MAG included in the second path, the first path includes the first MAG 131, and the second path includes the second MAG 132, the SDN controller 11 determines the LMA. And the second MAG 132 in the second path is a network element device that needs to receive a flow entry adjustment message;

1106. The SDN controller 11 sends a first tunnel establishment message to the LMA 14, where the first tunnel establishment message includes: establishing a tunnel configuration message between the LMA 14 and the second MAG 132.

1107. The LMA 14 establishes a tunnel interface on the LMA 14 side of the tunnel between the LMA and the second MAG according to the received first tunnel setup message.

1108. The SDN controller 11 sends a second tunnel setup message to the second MAG 132, where the second tunnel setup message includes: establishing a tunnel configuration message between the LMA 14 and the second MAG 132.

1109. The second MAG 132 establishes the LMA according to the received second tunnel establishment message. - a tunnel interface on the second MAG 132 side of the tunnel with the second MAG.

The SDN controller 11 sends a second flow entry adjustment message to the second MAG 132, where the content of the second flow entry adjustment message includes: a second matching item: the source address prefix is a communication address prefix of the first data stream; The flow table operation corresponding to the second matching item: forwarding the first data stream in the flow entry from the LMA-second MAG tunnel interface; and the content of the second flow entry adjustment message further includes: a third matching item: The address prefix is a communication address prefix of the first data stream; the flow table operation corresponding to the third matching item is: setting a next hop of the first data stream in the flow entry to the second interface;

The first MAG 132 adds the second flow entry according to the received second flow entry adjustment message.

The SDN controller 11 sends a third flow entry adjustment message to the LMA 14, where the content of the third flow entry adjustment message includes: a fourth match: the destination address prefix is a communication address prefix of the first data stream; The flow table operation corresponding to the four matches: forwarding the first data flow in the flow entry from the LMA-second MAG tunnel interface;

1113. The LMA 14 modifies the flow entry stored by the LMA to the third flow entry according to the received third flow entry adjustment message.

1114. When the SDN controller 11 determines that the LMA 14 and the second MAG 132 adjust the flow entry, the SDN controller 11 encapsulates the communication address prefix of the first data stream in the RA message, and sends the RA message to the second message. MAG 132;

1115. The second MAG 132 sends the RA message to the MN 12.

It should be noted that, in the embodiment of the present invention, when there are multiple MAG devices, after the first data stream is moved, the MAG in which the first data stream is moved further includes a flow entry related to the first data flow. At this time, the SDN controller 11 may send the flow entry deletion message to the MAG in which the first data flow is moved. The flow entry deletion message is used to indicate that the MAG deletes the flow entry related to the first data flow, or the MAG. When the flow entry related to the first data flow is not used within the specified time, the flow entry related to the first data flow is deleted.

In this embodiment, when there are multiple MAGs, the SDN controller 11 determines that the LMA 14 and the second MAG 132 in the second path are the network element devices that need to send the flow entry adjustment message, and the SDN controller 11 sends the LMA 14 to the LMA 14. The first tunnel setup message is sent to the second MAG 132 to establish a tunnel between the LMA and the second MAG, and then the second flow entry adjustment message is sent to the second MAG to the LMA. Send a third flow entry adjustment message, the second MAG 132 And adding the second flow entry according to the received second flow entry adjustment message, and the LMA 14 modifies the flow entry stored by the LMA 14 to the third flow table according to the received third flow entry adjustment message. The first data stream is sent from the second interface to the LMA 14 via the second MAG 132, so that negotiation of data flow between the network element devices is not required, and the network element device MAG can be compared according to the prior art. The controller commands to operate, so that the network element device MAG can be applied to any IP protocol, thereby saving costs in network construction.

The SDN controller in the embodiment of the present invention is further described. Referring to FIG. 12, an embodiment of the SDN controller in the embodiment of the present invention includes: a processor 1201 and a transmitter 1202;

The processor 1201 is configured to determine that the first data stream needs to be moved from the first interface of the MN to the

a second interface of the MN, where the first interface corresponds to the first path of the first data stream, the second interface corresponds to the second path of the first data stream, and the MAG included in the second path is determined to be included in the first path Whether the MAG is the same device;

The processor 1201 is further configured to: determine, according to the determining result, a network element device that needs to receive a flow entry adjustment message in the network element device of the second path;

The sender 1202 is configured to send the flow entry adjustment message to the determined network element device, where the flow entry adjustment message is used to indicate that the first data flow is moved from the first path to the second path.

The processor 1201 is further configured to: if the judgment result is that the MAG included in the first path is the same device as the MAG included in the second path, and the same device is the first MAG, determining the The first MAG is a network element device that needs to receive a flow entry adjustment message sent by the SDN controller;

The transmitter 1202 is further configured to send a first flow entry adjustment message to the first MAG, where the first flow entry adjustment message is used to indicate that the first MAG adjusts the content of the message according to the first flow entry. Modifying the flow entry in the first MAG to the first flow entry;

The processor 1201 is further configured to: if the determining result is that the MAG included in the first path is not the same device as the MAG included in the second path, where the first path includes the first - -

a MAG, where the second path includes a second MAG, and the local mobility anchor point LMA and the second MAG are network element devices that need to receive the flow entry adjustment message;

The transmitter 1202 is further configured to send, by the second MAG, a second flow entry adjustment message, where the second flow entry adjustment message is used to indicate that the second MAG adjusts the message according to the second flow entry. Adding a second flow entry to the content;

The transmitter 1202 is further configured to send a third flow entry adjustment message to the LMA, where the third flow entry adjustment message is used to indicate that the LMA adjusts the content of the message according to the third flow entry The flow entry in the LMA is modified to the third flow entry.

The processor 1201 is further configured to: determine that the second MAG does not establish a tunnel with the LMA; the transmitter 1202 is further configured to send a first tunnel setup message to the LMA, where the first tunnel setup message is sent. a tunnel interface on the LMA side that is used to instruct the LMA to establish a tunnel between the LMA and the second MAG, where the first tunnel establishment message includes: establishing between the LMA and the second MAG Tunnel configuration message for the tunnel;

The transmitter 1202 is further configured to send a second tunnel setup message to the second MAG, where the second tunnel setup message is used to indicate that the second MAG establishes between the LMA and the second MAG. The tunnel interface of the second MAG side of the tunnel, the second tunnel establishment message includes: a tunnel configuration message that establishes a tunnel between the LMA and the second MAG.

The processor 1201 is further configured to determine that the LMA and the second MAG adjust a flow entry; the transmitter 1202 is further configured to encapsulate a communication address prefix of the first data flow in a router advertisement RA In the message, the RA message is sent to the MN through the second MAG.

The processor 1201 is further configured to acquire load information of the first MAG corresponding to the first interface. The processor 1201 is further configured to determine, according to the load information, that a load of the first MAG is greater than or equal to a preset load threshold;

The processor 1201 is further configured to acquire the load information of the MAG corresponding to the other interfaces of the MN, and obtain the MAG corresponding to the other interfaces according to the acquired load information of the MAG corresponding to the other interfaces and the location of the MN. Selecting the second MAG for the MN, where the second MAG corresponds to the second interface.

The processor 1201 is further configured to determine that the second interface is in an enabled state;

The SDN controller further includes a receiver;

The receiver is configured to receive a first bearer message sent by the first MAG, where the first bearer message includes identifier information of the second interface;

The processor 1201 is further configured to determine, according to the first bearer message, that the first data stream needs to be moved from a first interface of the MN to a second interface of the MN.

The receiver is further configured to receive a second bearer message sent by the second MAG, where the second bearer message includes identifier information of the second interface;

The processor 1201 is further configured to determine, according to the second bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

The processor 1201 is further configured to: determine that the second interface that is not enabled by the MN is enabled; the receiver is further configured to receive a third bearer message from the second MAG, where the third bearer message is The L2 layer attachment request of the MN is included in the processor, and the processor 1201 is further configured to: according to the third bearer message, determine that the first data flow needs to be moved from the first interface of the MN to the second end of the MN. Interface; or

When the MN has more than two interfaces, the receiver is further configured to receive a fourth bearer message from a MAG corresponding to an interface of the MN, where the fourth bearer message includes the L2 of the MN. The layer attachment request, the processor 1201 is further configured to determine, according to the fourth bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN.

The processor 1201 is further configured to: determine that the MN opens the second interface that is not enabled; the receiver is configured to receive a fifth bearer message from the first MAG, where the processor 1201 further Determining, according to the fifth bearer message, determining that the first data stream is moved from the first interface of the MN to the second interface of the MN; - The fifth bearer message includes an L2 layer attach request of the MN, and the L2 layer attach request of the MN is used to request access to the first MAG by using the second interface.

In this embodiment, the SDN controller can determine, by the processor 1201, whether the MAG included in the second path and the MAG included in the first path where the first interface is located are the same device. And determining, according to the judgment result, the network element device that needs to receive the flow entry adjustment message in the network element device of the second path, and then sending the flow entry adjustment message to the determined network element device by using the transmitter 1202, so as to implement The first data stream is moved from the first path to the second path, so that no negotiation between the network element devices is required, and compared with the prior art, the information between the network element devices is reduced during the data flow moving process. The interaction is such that the network element device can be applied to any IP protocol, thereby saving costs in network construction.

The following describes the method for the data stream movement performed by the SDN controller. Referring to FIG. 13, an embodiment of the method for moving a data stream in the embodiment of the present invention includes:

1301: The SDN controller determines that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN, and determines whether the mobile access gateway MAG included in the second path and the MAG included in the first path are For the same device;

In this embodiment, the first interface corresponds to the first path of the first data stream, and the second interface corresponds to the second path of the first data stream, where the first path and the second path refer to the transmission of the data stream from the MN to the LMA. path.

The SDN controller determines, according to the judgment result, the network element device that needs to receive the flow entry adjustment message in the network element device of the second path;

In this embodiment, the SDN controller may determine whether the MAG included in the second path is the same device as the MAG included in the first path where the first interface is located, and then the network element device in the second path according to the determination result. The network element device that needs to send the flow entry adjustment message is determined. In an actual application, the MAG managed by the SDN controller may have only one or multiple MAGs, and one MAG may correspond to one network.

1303. The SDN controller sends the flow entry adjustment message to the determined network element device, where the flow entry adjustment message is used to indicate that the first data flow is moved from the first path to the second path.

In this embodiment, during the data flow, the SDN controller may determine whether the MAG included in the second path and the MAG included in the first path where the first interface is located are the same device, and according to the judgment result. Determining that the flow entry adjustment message needs to be received in the network element device of the second path And the network element device sends the flow entry adjustment message to the determined network element device, so as to implement the first data flow from the first path to the second path, so that no negotiation between the network element devices is required. Moreover, compared with the prior art, in the data flow moving process, the signaling interaction between the network element devices is reduced, so that the network element device can be applied to any IP protocol, thereby saving cost in network construction.

The following describes a method for moving a data stream in the embodiment of the present invention by using a specific example. Referring to FIG. 14, another embodiment of the method for moving a data stream in the embodiment of the present invention, when there is only one MAG device, the MAG is the first When the MAG, and the second interface is in the enabled state, the method includes:

1401: The SDN controller receives the first bearer message sent by the first MAG.

In this embodiment, the SDN controller may receive the first bearer message sent by the first MAG, where the first bearer message includes the identifier information of the second interface, where the identifier information is, for example, the name, number, and the like of the second interface. In an actual application scenario, such as shown in FIG. 3, initially, the MN transmits the data stream X to the first MAG through the interface 1, and then sends it to the LMA via the first MAG, when the SDN controller determines that the interface 2 needs to be used to transmit data. When the stream X is sent, the first MAG may send a first bearer message to the SDN controller, where the first bearer message is used to notify the identifier information of the SDN controller interface 2, and the SDN controller determines, according to the first bearer message, that the first data stream needs to be The first interface of the MN is moved to the second interface of the MN. In the actual application, since the second interface is in the open state, the MN does not need to register with the second interface to the network, so the MN can directly send the first data flow to the first MAG through the second interface.

It should be noted that, in the initial state, the first MAG includes a flow entry of the first data flow, and the first MAG may be based on the first data flow, regardless of which interface of the MN is sent to the first MAG. The flow entry forwards the first data flow to the LMA. Therefore, when the first MAG sends the first bearer message to the SDN controller, the first MAG may forward the first data stream received from the second interface to the LMA. Of course, the first MAG may send the first data stream to the LMA after receiving the first flow entry adjustment message.

1402: The SDN controller determines, according to the first bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN;

1403. The SDN controller determines whether the MAG included in the second path is the same device as the MAG included in the first path where the first interface is located.

In this embodiment, the SDN controller may determine whether the MAG included in the second path is the same device as the MAG included in the first path where the first interface is located, because this embodiment is only - - On the premise of a MAG device, the judgment result must be that the first path is the same as the MAG in the second path, and the same MAG is the first MAG, and then step 1404 is performed.

1404. The SDN controller determines that the first MAG is a network element device that needs to receive a flow entry adjustment message.

1405. The SDN controller sends a first flow entry adjustment message to the first MAG.

In this embodiment, when the result of the determination is that the first path is the same as the MAG in the second path, and the same MAG is the first MAG, the SDN controller determines that the first MAG needs to receive the flow entry adjustment message. The network element device, the first flow entry adjustment message is used to indicate that the first MAG modifies the flow entry in the first MAG to the first flow entry, and the content of the first flow entry adjustment message includes: a first match: The address prefix is the communication address prefix of the first data stream; the flow table operation corresponding to the first matching item is: setting the next hop of the first data stream in the flow entry to the second interface.

In this embodiment, when there is only one MAG, the SDN controller determines that the MAG included in the second path is the same device as the MAG included in the first path where the first interface is located, and the SDN controller determines As a result, it is determined that the first MAG is a network element device that needs to receive a flow entry adjustment message, and then sends a first flow entry adjustment message to the first MAG, so that negotiation of data flow between the network element devices is not required, and Compared with the technology, the network element device MAG can operate according to the SDN controller command, so that the network element device MAG can be applied to any IP protocol, thereby saving costs in network construction.

Referring to FIG. 15, another method for moving a data stream in the embodiment of the present invention when there is only one MAG device, the MAG is the first MAG, and the second interface is in an unopened state before the first data stream moves. For example, including:

1501: When the MN opens the second interface that is not enabled, the SDN controller receives the fifth bearer message from the first MAG.

In this embodiment, the MN needs to open the second interface that is not enabled before the data stream is transferred, and the MN sends the L2 to the first MAG after the data stream is forwarded. a layer attach request, to request the first MAG to access the second interface of the MN to the first MAG, the first MAG receives the L2 layer attach request sent by the MN, encapsulates the L2 layer attach request in the fifth bearer message, and then Five bearer messages are sent to the SDN controller.

1502: The SDN controller determines, according to the fifth bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN; - -

1503. The SDN controller determines that the MAG included in the second path is the same device as the MAG included in the first path where the first interface is located.

In this embodiment, the SDN controller may determine whether the MAG included in the second path is the same device as the MAG included in the first path where the first interface is located, because the embodiment is only one MAG device. The judgment result must be that the MAG included in the first path is the same as the MAG included in the second path, and the same MAG is the first MAG, and then step 1504 is performed.

1504. The SDN controller determines that the first MAG is a network element device that needs to receive a flow entry adjustment message.

1505. The SDN controller sends a first flow entry adjustment message to the first MAG.

In this embodiment, when there is only one MAG, the SDN controller determines that the MAG included in the second path is the same device as the MAG included in the first path where the first interface is located, and the SDN controller is configured according to the SDN controller. The determining result determines that the first MAG is a network element device that needs to receive a flow entry adjustment message, and then sends a first flow entry adjustment message to the first MAG, so that negotiation of data flow between the network element devices is not required, and Compared with the prior art, the network element device MAG can operate according to the SDN controller command, so that the network element device MAG can be applied to any IP protocol, thereby saving cost in network construction.

Referring to FIG. 16, in this embodiment, the network has multiple MAG devices, and the multiple MAG devices include a first MAG and a second MAG, and the second interface is in an open state, correspondingly, the data flow in this embodiment. The triggering condition of the transfer is that the first MAG load is overloaded. The method for moving the data flow in this embodiment includes:

The SDN controller obtains the load information of the first MAG corresponding to the first interface. In actual applications, the load information may be the quantity information of the interface that the MN accesses the first MAG, and the number of interfaces of the MN that the MAG accesses is more. More, the load will be bigger. - -

1602. The SDN controller determines, according to the load information, that the load of the first MAG is greater than or equal to a preset load threshold;

1603. The SDN controller obtains load information of the MAG corresponding to the other interfaces of the MN.

1604, the SDN controller selects a second MAG for the MN from the MAG corresponding to the other interface according to the acquired load information of the MAG corresponding to the other interface and the location of the MN;

In this embodiment, the first MAG is corresponding to the first interface, and the second MAG is corresponding to the second interface, and the selected second MAG may be the MAG in which the load of all the MAGs is less than the preset load threshold, or may be in all the MAGs. The lightest load MAG.

1605. The SDN controller receives the second bearer message sent by the second MAG.

In this embodiment, the second MAG can directly send a second bearer message to the SDN controller, because the second interface is in the open state, and the tunnel is established between the LMA and the MAG in the second path.

1606. The SDN controller determines, according to the second bearer message, that the first data stream is moved from the first interface of the MN to the second interface of the MN.

In this embodiment, the second bearer message includes the identifier information of the second interface, and then the SDN controller may determine, according to the identifier information of the second interface in the second bearer message, that the first data stream needs to be from the first interface of the MN. Move to the second interface of the MN.

The following is an example. For example, as shown in FIG. 5, initially, the MN outputs the data stream X and the data stream Y to the first MAG through the interface 1, and then the first MAG outputs the data stream X and the data stream Y to the LMA, LMA. The communication address prefix assigned to data stream X is pref 1, and the communication address prefix assigned to stream Y is pref2. A flow entry for forwarding the data flow X and the data flow Y is stored in the first MAG, and the flow entry corresponding to the data flow X has a communication address prefix of prefl, and the flow entry corresponding to the flow entry Y has a communication address. The prefix is pref2.

At a certain time, the SDN controller acquires the load information of the first MAG. When it is determined that the load information of the first MAG is greater than or equal to the preset load threshold, it is determined that the data stream Y needs to be interface-transferred. The SDN controller obtains the load information of the MAG corresponding to the other interfaces of the MN, and obtains the MAG with the lightest load or the load less than the load threshold as the second MAG according to the location of the MN, and the second MAG corresponds to the interface 2, so that the SDN control The device determines that the data stream Y needs to be transferred from interface 1 to interface 2. Since the interface 2 is in the open state, the MN does not need to register to the network through the interface 2, and the second MAG sends the first bearer message directly to the SDN controller. - The information includes the identification information of the second interface, so that the SDN controller determines that the data stream Y needs to be transferred to the second interface.

1607. The SDN controller determines that the MAG included in the second path is not the same device as the MAG included in the first path where the first interface is located.

In an actual application, since a condition of having multiple MAGs is defined, according to the protocol, for an MN, each interface of the MN corresponds to one MAG device. For example, the MN 1 has three interfaces, an interface A, an interface B, and an interface C. In this case, the interface A corresponds to the MAG A, the interface B corresponds to the MAG B, and the interface C corresponds to the MAG C. Specifically, in this embodiment, the determination result must be that the first path and the second path are not the same MAG, the first path. The first MAG is included, and the second path includes the second MAG.

1608. The SDN controller determines that the LMA and the second MAG in the second path are network element devices that need to receive the flow entry adjustment message.

In a practical application, since the first data stream moves to the second path, the second MAG and the LMA in the second path do not forward the flow entry of the first data stream, so the LMA and the second path are determined. The second MAG is a network element device that needs to receive a flow entry adjustment message.

1609. The SDN controller sends a second flow entry adjustment message to the second MAG.

In this embodiment, the second flow entry adjustment message is used to indicate that the second MAG adds a second flow entry, and the content of the second flow entry adjustment message includes: a second match: the source address prefix is the first data. The flow address prefix of the flow; the flow table operation corresponding to the second match: forwarding the first data flow in the flow entry from the LMA-second MAG tunnel interface; and the content of the second flow entry adjustment message further includes The third matching item: the destination address prefix is the communication address prefix of the first data stream; the flow table operation corresponding to the third matching item: setting the next hop of the first data stream in the flow entry to the second interface.

1610. The SDN controller sends a third flow entry adjustment message to the LMA.

In this embodiment, the third flow entry adjustment message is used to indicate that the LMA changes the flow entry in the LMA to a third flow entry, and the content of the third flow entry adjustment message includes: a fourth match: The destination address prefix is the communication address prefix of the first data stream. The flow table operation corresponding to the fourth matching item is: forwarding the first data stream in the flow entry from the LMA-second MAG tunnel interface.

It should be noted that, in this embodiment, the communication address prefix corresponding to each data stream is different. As shown in FIG. 5, the communication address prefix of the data stream X is prefl, and the communication address prefix of the data stream Y is pref2, and When a data stream is transferred to another path for transmission, its communication address prefix remains unchanged. After the second flow entry adjustment message is sent to the second MAG and the third flow entry adjustment message is sent to the LMA, the SDN controller may further determine whether the LMA and the second MAG adjust the flow entry, and if so, Then, the communication address prefix of the first data stream is encapsulated in the router advertisement RA message, and then the RA message is sent to the MN through the second MAG.

In this embodiment, when there are multiple MAGs, the SDN controller may select the second MAG for the MN by using the load state information of the first MAG and the location of the MN, and determine the first according to the second bearer message sent by the second MAG. a data stream is moved from the first interface of the MN to the second interface of the MN, and then the SDN controller determines that the LMA and the second MAG in the second path are network element devices that need to receive the flow entry adjustment message, and The second MAG sends a second flow entry adjustment message, and sends a third flow entry adjustment message to the LMA, so that the first data flow is sent from the second interface of the MN to the LMA via the second MAG, so that no need is needed between the network element devices. The data stream movement negotiation is performed, and compared with the prior art, the network element device MAG can operate according to the SDN controller instruction, so that the network element device MAG can be applied to any IP protocol, thereby saving cost in network construction.

Referring to FIG. 17, in this embodiment, there are multiple MAG devices in the network, and the multiple MAG devices include a first MAG and a second MAG. In the initial state, the second interface is in an unopened state, correspondingly, this embodiment The triggering condition of the data stream transfer is to enable the second interface that is not enabled. The method for moving the data stream in this embodiment includes:

1701: When the MN opens the second interface that is not enabled, the SDN controller receives a third bearer message from the second MAG.

In this embodiment, the first interface corresponds to the first path of the first data stream, and the second interface corresponds to the second path of the first data stream, where the first data stream is initially transmitted through the first path.

Since the second interface of the MN is initially in an unopened state, after the MN turns on the second interface that is not enabled, the data stream is triggered to be moved. After being turned on, the MN sends an L2 layer attach request to the second MAG to request the first The second MAG accesses the second interface of the MN to the second MAG, and the second MAG receives the L2 layer attach request sent by the MN, encapsulates the L2 layer attach request in the third bearer message, and then sends the third bearer message to the SDN control. Device.

1702, the SDN controller determines, according to the third bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN;

1703. The SDN controller determines that the MAG included in the second path is the same device as the MAG included in the first path where the first interface is located. In this embodiment, the SDN controller can determine whether the MAG included in the second path and the MAG included in the first path where the first interface is located are the same device, because the embodiment has multiple MAGs. On the premise of the device, the judgment result must be that the MAG included in the first path and the MAG included in the second path are not the same device, the first path includes the first MAG, and the second path includes the second MAG, and then the steps are performed. 1704.

1704. The SDN controller determines that the LMA and the second MAG are network element devices that need to receive the flow entry adjustment message.

Since the second interface of the MN is a newly opened interface, a tunnel is not established between the second MAG and the LMA in the second path, and the tunnel is first established through steps 1705 and 1706.

1705. The SDN controller sends a first tunnel establishment message to the LMA.

The first tunnel establishment message is used to indicate that the LMA establishes a tunnel interface on the LMA side of the tunnel between the LMA and the second MAG, and the first tunnel establishment message includes: a tunnel configuration message that establishes a tunnel between the LMA and the second MAG.

1706. The SDN controller sends a second tunnel establishment message to the second MAG.

The second tunnel establishment message is used to indicate that the second MAG establishes a tunnel interface on the second MAG side of the tunnel between the LMA and the second MAG, and the second tunnel establishment message includes: establishing a tunnel configuration of the tunnel between the LMA and the second MAG Message.

1707. The SDN controller sends a second flow entry adjustment message to the second MAG, where the second flow entry adjustment message is used to indicate that the second MAG adds the second flow entry according to the content of the second flow entry adjustment message. The content of the flow entry adjustment message includes: a second match: the source address prefix is a communication address prefix of the first data stream; a flow table operation: forwarding the first data stream from the LMA-second MAG tunnel interface; and the The content of the second-flow entry adjustment message further includes: a third matching item: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: setting a next hop of the first data stream as the second interface.

1708. The SDN controller sends a third flow entry adjustment message to the LMA, where the third flow entry adjustment message is used to instruct the LMA to modify the flow entry in the LMA to the third flow table according to the content of the third flow entry adjustment message. Item

It should be noted that, in this embodiment, the communication address prefix corresponding to each data stream is different, such as - - As shown in Figure 5, the communication address prefix of data stream X is prefl, the communication address prefix of data stream Y is pref2, and when a certain data stream is transferred to another path for transmission, its communication address prefix remains unchanged.

In addition, after the second flow entry adjustment message is sent to the second MAG and the third flow entry adjustment message is sent to the LMA, the SDN controller may further determine whether the LMA and the second MAG adjust the flow entry, and if yes, The communication address prefix of the first data stream is encapsulated in the router advertisement RA message, and then the RA message is sent to the MN through the second MAG.

It should be noted that, in the embodiment of the present invention, when there are multiple MAG devices, after the first data stream is moved, the MAG in which the first data stream is moved further includes a flow entry related to the first data flow. At this time, the SDN controller may send the flow entry deletion message to the MAG where the first data flow is moved. The flow entry deletion message is used to indicate that the MAG deletes the flow entry related to the first data flow, or the MAG is in the MAG. If the flow entry related to the first data flow is not used within the specified time, the flow entry related to the first data flow is deleted.

In this embodiment, when there are multiple MAGs, after the SDN controller determines that the LMA and the second MAG in the second path are the network element devices that need to receive the flow entry adjustment message, the SDN controller sends the first tunnel to the LMA. Establishing a message, and sending a second tunnel establishment message to the second MAG, so as to establish a tunnel between the LMA and the second MAG, and then sending a second flow entry adjustment message to the second MAG, and sending the message to the second MAG The second flow entry adjustment message is sent to the LMA from the second interface by using the second MAG, so that the negotiation of the data flow between the network element devices is not required, and the network element device is compared with the prior art. The MAG can operate according to the SDN controller command, so that the network element device MAG can be applied to any IP protocol, thereby saving costs in network construction.

It should be noted that the device embodiments described above are merely illustrative, and the components may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Further, in the drawings of the apparatus embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection therebetween, and specifically, one or more communication buses or signal lines can be realized. Those of ordinary skill in the art can understand and implement without any creative effort.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general hardware, and of course can also be included by dedicated hardware. - - ASIC, dedicated CPU, dedicated memory, dedicated components, etc. In general, functions performed by computer programs can be easily implemented with the corresponding hardware. Moreover, the specific hardware structure used to implement the same function can be various, such as analog circuits, digital circuits, or dedicated circuits. Circuits, etc. However, for the purposes of the present invention, software program implementation is a better implementation in more cases. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer. , U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., including a number of instructions to make a computer device (may be a personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.

The method for the data flow movement, the network system, and the SDN controller provided by the embodiment of the present invention are described in detail. For those skilled in the art, according to the idea of the embodiment of the present invention, the specific implementation manner and the application range There is a change in the above, and therefore, the content of the present specification should not be construed as limiting the invention.

Claims

Rights request

A software custom network SDN controller, characterized in that: the SDN controller comprises:

a first determining unit, configured to determine that the first data stream needs to be moved from the first interface of the mobile node MN to the second interface of the MN, where the first interface corresponds to the first path of the first data stream, where Determining, by the second interface, the second path of the first data stream, and determining whether the mobile access gateway MAG included in the second path is the same device as the MAG included in the first path;

a second determining unit, configured to determine, according to the determining result of the first determining unit, a network element device that needs to receive a flow entry adjustment message in the network element device of the second path;

The SDN controller according to claim 1, wherein the flow entry adjustment message is further configured to instruct the network element device to adjust the content of the message according to the content of the flow entry adjustment message. Flow entry.

The SDN controller according to claim 2, wherein the second determining unit is configured to: in the determining result, the MAG included in the first path and the MAG included in the second path When the same device is the same device, the first MAG is determined to be a network element device that needs to receive a flow entry adjustment message;

The SDN controller according to claim 2, wherein the second determining unit is configured to: include, in the MAG included in the first path, the second path, in the determining result The MAG is not the same device, the first path includes the first MAG, and when the second path includes the second MAG, determining that the local mobility anchor point LMA and the second MAG need to receive the flow table The NE device of the item adjustment message;

The first sending unit includes: a first sending subunit, configured to send a second flow entry adjustment message to the second MAG, where the second flow entry adjustment message is used to indicate that the second MAG adjusts the message according to the second flow entry Adding a second flow entry to the content;

a second sending subunit, configured to send a third flow entry adjustment message to the LMA, where the third flow entry adjustment message is used to indicate that the LMA adjusts the content of the message according to the third flow entry The flow entry in the LMA is modified to be a third flow entry.

The SDN controller according to claim 4, wherein the first determining unit is further configured to: when determining that the first data stream needs to be moved from the first interface of the mobile node MN to the MN Before the second interface, determining that the second MAG in the second path does not establish a tunnel with the LMA;

The SDN controller further includes:

The SDN controller according to claim 4 or 5, wherein the SDN controller further comprises:

a third determining unit, configured to determine that the LMA and the second MAG adjust the flow entry; An encapsulating unit, configured to encapsulate a communication address prefix of the first data stream in a router advertisement RA message;

And a fourth sending unit, configured to send the RA message to the MN by using the second MAG.

The SDN controller according to any one of claims 4 to 6, wherein the first determining unit comprises:

The first determining unit further includes:

The SDN controller according to claim 3, wherein the first determining unit comprises:

The SDN controller according to claim 4, wherein the first determining unit comprises:

The SDN controller according to claim 4, wherein the first determining unit comprises: a sixth determining subunit, configured to determine that the second interface that is not enabled by the MN is enabled; and a third receiving subunit, configured to receive a third bearer message from the second MAG, where the third bearer message is Including an L2 layer attach request of the MN;

a seventh determining subunit, configured to determine, according to the third bearer message, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN; or

A network system, the system comprising: a mobile node MN, a software custom network SDN controller, and at least one mobile access gateway MAG;

The SDN controller is configured to determine that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN, where the first interface corresponds to the first path of the first data stream, The second interface corresponds to the second path of the first data stream, and determines that the second path is included

Whether the MAG and the MAG included in the first path are the same device;

The system according to claim 12, wherein the flow entry adjustment message is further And the device is configured to instruct the network element device to adjust a flow entry in the network element device according to the content of the flow entry adjustment message.

The system according to claim 13, wherein the at least one MAG includes a first MAG;

The SDN controller is configured to send a first flow entry adjustment message to the first MAG, where the first flow entry adjustment message is used to instruct the first MAG to adjust the content of the message according to the first flow entry. Modifying the flow entry in the first MAG to the first flow entry, where the content of the first flow entry adjustment message includes: a first match: the destination address prefix is a communication address prefix of the first data flow; Action: Set the next hop of the first data stream to the second interface.

The system according to claim 13, wherein the system further comprises: a local mobile anchor point LMA, wherein the at least one MAG includes a first MAG and a second MAG;

The SDN controller is specifically configured to: when the determining result is that the MAG included in the first path is not the same device as the MAG included in the second path, where the first path includes the first a MAG, where the second path includes the second MAG, determining that the LMA and the second MAG are network element devices that need to receive the flow entry adjustment message;

The SDN controller is specifically configured to send a second flow entry adjustment message to the second MAG, where the second flow entry adjustment message is used to indicate that the second MAG is configured according to the second flow entry. Adjusting the content of the message to add a second flow entry;

The content of the second flow entry adjustment message includes: a second matching item: the source address prefix is a communication address prefix of the first data stream; and the flow table operation: forwarding the first data stream from the LMA-second MAG tunnel interface; And the content of the second flow entry adjustment message further includes: a third matching item: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: setting the next hop of the first data stream to the second interface; The content of the third flow entry adjustment message includes: a fourth matching item: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: forwarding the first data stream from the LMA-second MAG tunnel interface.

16. The system of claim 15 wherein:

The SDN controller is further configured to determine the second MAG in the second path before determining that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN The LMA does not establish a tunnel;

17. A system according to claim 15 or claim 16 wherein:

The SDN controller is further configured to: after the sending the flow entry adjustment message to the determined network element device, determine that the LMA and the second MAG adjust the flow entry, and the first The communication address prefix of the data stream is encapsulated in a router advertisement RA message, and the RA message is sent to the MN through the second MAG.

18. A system according to any one of claims 15 to 17, wherein

The SDN controller is further configured to acquire load information of the first MAG corresponding to the first interface, and determine, according to the load information, that the load of the first MAG is greater than or equal to a preset load threshold, and obtain the The load information of the MAG corresponding to the other interface of the MN, and selecting the second MAG for the MN from the MAG corresponding to the other interface according to the acquired load information of the MAG corresponding to the other interface and the location of the MN. The second MAG corresponds to the second interface.

19. The system of claim 14 wherein:

The SDN controller is further configured to receive a first bearer message sent by the first MAG, where the first bearer message includes identifier information of the second interface, and is determined according to the first bearer message. The first data stream is to be moved from the first interface of the MN to the second interface of the MN.

20. The system of claim 15 wherein:

The SDN controller is further configured to receive a second bearer message sent by the second MAG, where the second bearer message includes identifier information of the second interface, and determining, according to the second bearer message, that the The first data stream moves from the first interface of the MN to the second interface of the MN.

21. The system of claim 15 wherein:

22. The system of claim 14 wherein:

23. A software custom network SDN controller, characterized in that:

a processor, configured to determine that a first data stream needs to be moved from a first interface of the mobile node MN to a second interface of the MN, where the first interface corresponds to a first path of the first data stream, where The second interface corresponds to the second path of the first data stream, and determines whether the mobile access gateway MAG included in the second path and the MAG included in the first path are the same device, according to the determining Determining, in the network element device of the second path, a network element device that needs to receive a flow entry adjustment message;

a transmitter, configured to send to the processor, the network element device that needs to receive the flow entry adjustment message And sending the flow entry adjustment message, where the flow entry adjustment message is used to indicate that the first data flow is moved from the first path to the second path.

The SDN controller according to claim 23, wherein the flow entry adjustment message is further configured to instruct the network element device to adjust the content of the message according to the content of the flow entry adjustment message. Flow entry.

25. A method of moving a data stream, the method comprising:

The method according to claim 25, wherein the flow entry adjustment message is further used to instruct the network element device to adjust a flow entry in the network element device according to the content of the flow entry adjustment message.

The method according to claim 26, wherein the SDN controller determines, in the network element device of the second path, that it needs to receive a flow entry adjustment message sent by the SDN controller according to the determination result. The NE device specifically includes:

If the result of the determination is that the MAG included in the first path is the same device as the MAG included in the second path, the same device is the first MAG, and the SDN controller determines that the first MAG is And the network element device that needs to receive the flow entry adjustment message sent by the SDN controller; the SDN controller sends the flow entry adjustment message to the determined network element device that needs to receive the flow entry adjustment message, specifically :

The content of the first flow entry adjustment message includes: a first matching item: the destination address prefix is a communication address prefix of the first data stream; and the flow table operation: setting a next hop of the first data stream as the second interface.

29. The method of claim 28, wherein the method is prior to the SDN controller determining that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN Also includes:

The SDN controller determines that the second MAG does not establish a tunnel with the LMA; the SDN controller sends a first tunnel establishment message to the LMA, where the first tunnel establishment message is used to indicate the LMA establishment a tunnel interface on the LMA side of the tunnel between the LMA and the second MAG, where the first tunnel establishment message includes: establishing the LMA and the Tunnel configuration message of the tunnel between the second MAGs;

The method according to claim 28 or 29, wherein, after the SDN controller sends the flow entry adjustment message to the determined network element device, the method further includes:

31. The method according to any one of claims 28 to 30, wherein the SDN controller determines that the first data stream needs to be moved from a first interface of the MN to a first end of the MN The second interface specifically includes:

The SDN controller acquires load information of the MAG corresponding to the other interfaces of the MN, and according to the acquired load information of the MAG corresponding to the other interfaces, and the location of the MN is from the MAG corresponding to the other interfaces. The MN selects the second MAG, and the second MAG corresponds to the second interface.

The method according to claim 27, wherein the determining, by the SDN controller, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN comprises: the SDN The controller determines that the second interface is in an open state;

The method according to claim 28, wherein the determining, by the SDN controller, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN comprises: the SDN The controller determines that the second interface is in an open state; The SDN controller receives the second bearer message sent by the second MAG, where the second bearer message includes the identifier information of the second interface;

The method according to claim 28, wherein the determining, by the SDN controller, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN comprises: the SDN The controller determines that the MN opens the second interface that is not turned on;

The SDN controller receives a third bearer message from the second MAG, where the third bearer message includes an L2 layer attach request of the MN, and determines, according to the third bearer message, that the first data stream needs to be The first interface of the MN moves to the second interface of the MN; or

The method according to claim 27, wherein the determining, by the SDN controller, that the first data stream needs to be moved from the first interface of the MN to the second interface of the MN comprises:

Determining, by the SDN controller, that the MN opens the second interface that is not turned on;