WO2012155867A1

WO2012155867A1 - Packet sending method and access controller

Info

Publication number: WO2012155867A1
Application number: PCT/CN2012/076837
Authority: WO
Inventors: 吴兵
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-07-22
Filing date: 2012-06-13
Publication date: 2012-11-22
Also published as: CN102238091A; CN102238091B

Abstract

A packet sending method comprises: establishing the correspondence between address information of an access point and an interface for the access point to access an access controller; when the access controller accesses the access point, if the access controller finds that an outbound interface accessing the access point is a preset virtual interface, searching for an interface for the access point to access the access controller according to a next hop IP address and the correspondence, an IP address of the virtual interface and an IP address of the access point belonging to the same network segment; and packaging a data packet, and sending the data packet to the access point though the interface for the access point to access the access controller. An access controller comprises an establishing module, a searching module, and a sending module.

Description

Message sending method and access controller

Technical field

The present invention relates to the field of communications, and in particular, to a method for sending a message and an access controller. Background technique

In the access network, the star network topology is widely used. This networking mode is to access multiple access points simultaneously by one access controller, as shown in Figure 1. Access the different interfaces on the controller. As shown in Figure 1, interface 1, interface 2 to interface n must be configured with IP addresses of different network segments. Each access point needs to occupy one network segment. IP1 to IPn belong to different interfaces. network segment. Since a minimum network segment must also have 4 IP addresses, n access points need to occupy 4*n IP addresses. As the number of access points increases, the consumption of IP addresses is severe, and the number of routes to the access controller increases, which increases the complexity of network planning and management.

When the number of IP addresses is insufficient, the current method of multi-fetching is to use the unnumbered IP technology, ie IP UNNUMBERED. Accessing the controller-side interface 1. Interface 2 to interface n does not configure an IP address. Instead, configure the IP UNNUMBERED attribute. Configure a static route for each access point and directly specify the corresponding interface as the outbound interface of the static route. Unnumbered IP technology has a very limited condition. This technology is only applied to point-to-point interfaces and cannot be used during Ethernet access. In addition, a large number of static routes that directly specify outgoing interfaces are configured on the access controller. The management and maintenance costs are high.

There is also a technology for saving IP addresses on Ethernet, VLAN (Virtual Local Area)

Network, Virtual Local Area Network) is the SUPERVLAN. On the access controller, the physical interface is divided into logical interfaces that belong to different VLANs. These logical interfaces are called VLAN sub-interfaces. One or more VLAN sub-interfaces can be aggregated to form a new logical interface, that is, the SUPERVLAN interface. Each access point and the SUPERVLAN interface are planned with an IP address and are all divided into the same network segment. This technology is suitable for accessing multiple access points on the same interface. It needs to plan the VLAN of the network, including access controllers, access points, and Layer 2 networks between the two. This greatly increases the network. Planning and management complexity. Summary of the invention

The technical problem to be solved by the present invention is to provide a method for sending a message and an access controller to save IP address resources in the access network.

In order to solve the above technical problem, the present invention provides a packet sending method, including: establishing a correspondence between address information of an access point and an interface of the access point accessing the access controller; When accessing the access point, if the access controller finds that the outbound interface that accesses the access point is a preset virtual interface, the access point is searched according to the next hop IP address and the corresponding relationship. An interface of the access controller, where the IP address of the virtual interface belongs to the same network segment as the IP address of the access point;

Encapsulating the data packet, sending the data packet to the access point by using an interface of the access point to access the access controller.

Preferably, the foregoing method further has the following features: the correspondence between the address information of the access point and the interface of the access point to access the access controller includes:

The access controller enables an address resolution protocol proxy to learn media access control (MAC) address information of the access point;

Establishing an IP address of the access point, a MAC address of the access point, and a correspondence between the access point and an interface of the access point accessing the access controller.

Preferably, the foregoing method has the following features:: sending, by the access point, the interface of the access controller to the access point, to send the data packet to the access point, including:

Decapsulating a destination MAC address and a source MAC address of the Ethernet frame header according to the correspondence relationship;

And transmitting, by the access point, an interface of the access controller to the access point.

The access controller negotiates an IP address of the access point through an IP control protocol of a point-to-point protocol; Establishing a correspondence between an IP address of the access point and an interface of the access point to access the access controller.

Point-to-point protocol frame header information of the encapsulated message;

The access controller enables an asynchronous transfer mode address resolution protocol proxy to learn an asynchronous transfer mode address of the access point;

Establishing an IP address of the access point, an asynchronous transmission address of the access point, and a correspondence between an access point of the access point and an interface of the access controller.

Obtaining, according to the corresponding relationship, the virtual channel identifier of the virtual connection, the virtual path identifier, and the interface information of the virtual link, and converting the IP packet sent to the access point into an asynchronous transmission mode cell;

And transmitting, by the access point to an interface of the access controller, the asynchronous transmission mode cell to the access point.

To solve the above problem, the present invention further provides an access controller, including:

Establishing a module, which is configured to: establish a correspondence between address information of the access point and an interface of the access point to access the access controller;

a locating module, configured to: when the access controller accesses the access point, if the outbound interface that accesses the access point is a preset virtual interface, according to the next hop IP address and The corresponding relationship is used to search for an interface of the access point to access the access controller, where the IP address of the virtual interface belongs to the same network segment as the IP address of the access point;

a sending module, configured to: encapsulate a data packet, and access the access control by using the access point The interface of the device sends the data packet to the access point.

Preferably, the access controller further has the following features: The establishing module includes: a learning unit, configured to: enable an address resolution protocol proxy to learn a MAC address of the access point;

An establishing unit, configured to: establish an IP address of the access point, a MAC address of the access point, and a correspondence between an access point of the access point and an access controller;

The sending module includes:

The encapsulating unit is configured to: encapsulate the destination MAC address and the source MAC address of the Ethernet frame header of the packet according to the corresponding relationship;

And a sending unit, configured to: send, by the access point, an interface of the access controller to the access point.

Preferably, the access controller further has the following features: The establishing module includes: a learning unit, configured to: learn an IP address of the access point by using an IP control protocol of a point-to-point protocol;

The establishing unit is configured to: establish a correspondence between an IP address of the access point and an interface of the access point to access the access controller.

The sending module includes:

The encapsulation unit is configured to: encapsulate the point-to-point protocol frame header information of the message;

Preferably, the access controller further has the following features: The establishing module includes: a learning unit, configured to: enable an asynchronous transfer mode address resolution protocol proxy to learn an asynchronous transfer address of the access point;

An establishing unit, configured to: establish an IP address of the access point, an asynchronous transmission address of the access point, and a correspondence between an access point of the access point and an interface of the access controller;

The sending module includes:

The encapsulation unit is configured to: obtain a virtual channel identifier of the virtual connection according to the corresponding relationship, and virtual link The path identifier and the interface information of the virtual link are used to convert the IP packet sent to the access point into an asynchronous transmission mode cell;

And a sending unit, configured to: send the asynchronous transmission mode cell to the access point by using an interface of the access point to access the access controller.

In summary, the embodiment of the invention provides a method for sending a message and an access controller, which can save an IP address resource in the access network. BRIEF abstract

Figure 1 is a schematic diagram of a conventional access method;

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

FIG. 3 is a flowchart of a method for sending a message according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an access mode according to an embodiment of the present invention. Preferred embodiment of the invention

In order to make the objects, the technical solutions and the advantages of the present invention more clearly, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments of the present application may be arbitrarily combined with each other.

For a better understanding of the invention, the invention will be further described in conjunction with the drawings and specific embodiments.

FIG. 2 is a schematic diagram of an access controller according to an embodiment of the present invention. As shown in FIG. 2, the access controller of this embodiment includes:

Establishing a module, configured to establish a correspondence between address information of the access point and an interface of the access point to access the access controller;

a locating module, configured to: when the access controller accesses the access point, if the outbound interface that accesses the access point is a preset virtual interface, according to the next hop IP address and the Corresponding to find an interface of the access point to access the access controller, where the IP address of the virtual interface belongs to the same network segment as the IP address of the access point; And a sending module, configured to encapsulate the data packet, and send the data packet to the access point by using an interface of the access point to access the access controller.

In a preferred embodiment, the establishing module includes:

a learning unit, configured to enable an address resolution protocol proxy to learn a MAC address of the access point, and an establishing unit, configured to establish an IP address of the access point, a MAC address of the access point, and access by the access point Corresponding relationship of the interface of the access controller;

The sending module includes:

An encapsulating unit, configured to encapsulate a destination MAC address and a source MAC address of an Ethernet frame header of the packet according to the corresponding relationship;

And a sending unit, configured to send the packet to the access point by using an interface of the access point to access the access controller.

In a preferred embodiment, the establishing module includes:

a learning unit, configured to negotiate an IP address of the access point by using an IP control protocol of a point-to-point protocol;

And a establishing unit, configured to establish a correspondence between an IP address of the access point and an interface of the access point to access the access controller.

The sending module includes:

a packing unit, configured to encapsulate a point-to-point protocol frame header information of the message;

In a preferred embodiment, the establishing module includes:

a learning unit, configured to enable an asynchronous transfer mode address resolution protocol agent to learn an asynchronous transfer address of the access point;

An establishing unit, configured to establish an IP address of the access point, an asynchronous transmission address of the access point, and a correspondence between an access point of the access point and an interface of the access controller;

The sending module includes:

a coding unit, configured to obtain a virtual channel identifier and a virtual path identifier of the virtual connection according to the corresponding relationship Identifying the interface information of the virtual connection and converting the IP packet sent to the access point into an asynchronous transmission mode cell;

And a sending unit, configured to send, by using an interface of the access point to the access controller, the asynchronous transmission mode cell to the access point.

FIG. 3 is a flowchart of a method for sending a text according to an embodiment of the present invention. As shown in FIG. 3, the method in this embodiment includes:

S10. Establish a correspondence between address information of the access point and an interface of the access point to access the access controller.

S20, when the access controller accesses the access point, if the access controller finds that the outbound interface that accesses the access point is a preset virtual interface, according to the next hop IP address and location The corresponding relationship is used to find an interface of the access point to access the access controller, where the IP address of the virtual interface belongs to the same network segment as the IP address of the access point;

S30. Encapsulate a data packet, and send the data packet to the access point by using an interface of the access point to access the access controller.

The packet sending method in this embodiment is applicable to various access modes, for example, an Ethernet access mode, a PPP (Point-to-Point Protocol) access mode, and an IPoA (IP over ATM, It is applicable to bear the IP in the asynchronous transmission mode network. The access mode can greatly reduce the number of routes on the access controller and reduce the complexity of network planning and management.

The embodiments of the present invention are applicable to various access networks, and can be widely applied in a 3G access network. The WCDMA (Wideband Code Division Multiple Access) access network is taken as an example. If the access point in Figure 4 is a base station (Node B), the access controller is an RNC (Radio Network Controller). The specific implementation is as follows:

First, each Node B is configured with an IP (Internet Protocol) address, which can be planned on the same network segment. The RNC virtualizes an interface. The IP address configured for the virtual interface belongs to the same network segment as the IP address of the Node B. The actual interface of each Node B connected to the RNC does not need to be configured with an IP address.

The message transmission of the present invention will be described in detail below in three access modes.

Embodiment 1 Ethernet access mode: The access interface on the RNC side needs to enable the ARP (Address Resolution Protocol) proxy, which is used to proxy the MAC (Media Access Control) address of the RNC virtual interface IP address.

When Node B actively learns the RNC's MAC address, Node B sends an ARP request to the RNC. After receiving the ARP request, the access interface on the RNC side finds that the ARP proxy is enabled, and the proxy service IP responds, and sends the MAC response of the interface to the Node B. The MAC address of the Node B and the corresponding access RNC are also recorded. Correspondence of the interface. After receiving the ARP reply, Node B also learned the RNC's MAC.

When the RNC actively learns the MAC address of Node B, the RNC sends an ARP request to Node B. When an ARP request is sent from an ARP proxy-enabled interface, the source MAC address should be filled in as the MAC address of the interface. After receiving the ARP request, Node B will reply its own MAC address to the RNC and record the MAC address of the RNC. After receiving the ARP reply, the RNC learns the MAC address of the Node B and the corresponding interface to the RNC.

After the MAC address and the corresponding access RNC interface are learned, the mapping between the IP address of the Node B and the MAC address of the Node B and the access interface on the RNC side can be established, or the IP address of the Node B and the Node can be manually configured. After the correspondence between the MAC address of B and the access interface on the RNC side, the packet can be sent and received.

For the downlink packet, the RNC searches for the routing table to obtain the outbound interface. If the outbound interface is the default virtual interface, the RNC searches the ARP table according to the next hop IP address to obtain the MAC address of the Node B and the corresponding interface. After the inbound interface is encapsulated with the Ethernet frame header information such as the destination MAC address and source MAC address, it can be successfully sent out from the corresponding access interface. After Node B receives the message, there is no special situation and it can be processed normally.

For the uplink packet, when sending the packet, the Node B first searches the routing table to obtain the actual outgoing interface, and then searches the ARP table to obtain the MAC address of the RNC. After the packet encapsulates the Ethernet frame header information such as the destination MAC address and the source MAC address, It can be successfully sent out from the outbound interface. This sending process is the same as when the invention is not used. After the RNC receives the message, there is no special point, and it can be processed normally.

Embodiment 2: PPP access mode:

When the RNC negotiates with the Node B in the Point-to-Point Protocol (PPP) IPCP (IP Control Protocol), regardless of whether the IP address of the NodeB is manually configured or automatically on the RNC side. On the RNC side, the RNC can record the IP of the Node B through IPCP negotiation. This establishes the correspondence between the IP address of the Node B and the corresponding access RNC interface. Whether it is automatically learning the correspondence or manually configuring the correspondence, as long as the correspondence is available, the message can be sent and received.

For the downlink packet, when the RNC sends the packet, it first searches the routing table to obtain the outgoing interface, and the outgoing interface is the default virtual interface. Then, the corresponding relationship between the IP address of the Node B and the corresponding RNC interface is obtained, and the corresponding access interface is obtained. After the PPP frame header information of the packet is encapsulated, the corresponding access interface can be successfully sent out. After Node B receives the message, there is no special point and it can be processed normally.

For the uplink packet, when sending the packet, the Node B first searches the routing table to obtain the actual outgoing interface. After the packet encapsulates the PPP header information, the packet can be successfully sent out from the outgoing interface. This sending process does not use the present invention. The process is the same. After the RNC receives the message, there is no special point, and it can be processed normally.

Embodiment 3: IPoA access mode:

The access interface on the RNC side needs to enable the ATM ARP proxy to proxy the RNC virtual interface.

The ATM address of the IP address.

The learning process of the entire ATM address is the same as that of the Ethernet access. This can automatically learn the correspondence between the IP address of the Node B and the ATM address of the interface that the Node B accesses the RNC. With this correspondence, the text can be sent and received.

For the downlink packet, when the RNC sends the packet, it first searches the routing table to obtain the outgoing interface, and the outgoing interface is the default virtual interface. Then, the mapping between the IP address of the Node B and the ATM address of the interface that the Node B accesses the RNC is obtained, and the VPI (virtual channel identifier), the VCI (virtual path identifier), and the access of the virtual link of the corresponding virtual connection are obtained. Interfaces, IP packets can be converted to ATM cells and successfully sent out from the corresponding access interface. After Node B receives the cell, there is no special, normal processing can be.

For the uplink packet, when sending the packet, the Node B first searches the routing table to obtain the actual outgoing interface. After the IP packet is translated into the ATM cell, the packet can be successfully sent out from the outbound interface. The flow is the same when the invention is not used. After the RNC receives the cell, there is no special point. Normally, the ATM cell is converted into an IP file for processing.

Compared with the prior art, this embodiment saves the IP address resource in the access network, and does not increase the complexity in configuration. However, this embodiment is applicable to multiple access modes such as Ethernet, PPP, and IPoA, and is greatly reduced. The number of routes on the access controller facilitates the maintenance and management of the access controller. At the same time, the technical solution provided by the embodiment of the present invention is only for the access controller, and is completely transparent to the access point, and the access user does not need to make any adjustment.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

The above is only a preferred embodiment of the present invention, and of course, the present invention may be embodied in various other embodiments without departing from the spirit and scope of the invention. Corresponding changes and modifications are intended to be included within the scope of the appended claims.

Industrial Applicability The embodiment of the present invention provides a packet sending method and an access controller, which can save an IP address resource in an access network.

Claims

Claim

1. A method for sending texts, comprising:

Establishing a correspondence between the address information of the access point and the interface of the access point accessing the access controller; when the access controller accesses the access point, if the access controller finds the access The outbound interface of the access point is a preset virtual interface, and the interface of the access point accessing the access controller is searched according to the next hop IP address and the corresponding relationship, where the IP address of the virtual interface is The IP addresses of the access points belong to the same network segment.

The method of claim 1, wherein the establishing the correspondence between the address information of the access point and the interface of the access point accessing the access controller comprises:

The method of claim 2, wherein the encapsulating data packet, by using the access point to access the interface of the access controller, to send the data packet to the access point, includes:

Decapsulating a destination MAC address and a source MAC address of the Ethernet frame header of the message according to the correspondence relationship;

The access controller negotiates an IP address of the access point through an IP control protocol of a point-to-point protocol;

Establishing a correspondence between an IP address of the access point and an interface of the access point to access the access controller.

The method of claim 4, wherein the encapsulating data packet, by using the access point to access the interface of the access controller, to send the data packet to the access point, includes:

Point-to-point protocol frame header information of the encapsulated message;

The method of claim 6, wherein the encapsulating data packet, by using the access point to access the interface of the access controller, to send the data packet to the access point, includes:

8. An access controller, comprising:

And a sending module, configured to: encapsulate the data packet, and send the data packet to the access point by using an interface of the access point to access the access controller.

9. The access controller of claim 8, wherein The establishing module includes:

a learning unit, configured to: enable an address resolution protocol proxy to learn a MAC address of the access point;

The sending module includes:

10. The access controller of claim 8, wherein

The establishing module includes:

The learning unit is configured to: learn the IP address of the access point by using an IP control protocol of the point-to-point protocol;

Establishing a unit, configured to: establish a correspondence between an IP address of the access point and an interface of the access point to access the access controller;

The sending module includes:

11. The access controller of claim 8, wherein

The establishing module includes:

The learning unit is configured to: enable the asynchronous transfer mode address resolution protocol agent to learn the asynchronous transfer address of the access point;

The sending module includes: The encapsulating unit is configured to: obtain the virtual channel identifier of the virtual connection, the virtual path identifier, and the interface information of the virtual link according to the corresponding relationship, and convert the IP packet sent to the access point into an asynchronous transmission mode cell;