CN107786444B - Message transmission method and controller - Google Patents

Message transmission method and controller Download PDF

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CN107786444B
CN107786444B CN201610790706.1A CN201610790706A CN107786444B CN 107786444 B CN107786444 B CN 107786444B CN 201610790706 A CN201610790706 A CN 201610790706A CN 107786444 B CN107786444 B CN 107786444B
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segment routing
message
lisp
rloc
eid
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CN107786444A (en
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黄灿灿
朱永庆
伍佑明
谭景华
李阳春
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/164—Adaptation or special uses of UDP protocol

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention provides a message transmission method and a controller, and relates to the field of networks. The message transmission method comprises the following steps: the controller acquires an identity identifier and position separation protocol (LISP) message from a source router, wherein the LISP message comprises a routing position RLOC and a terminal identifier EID; determining a segment routing label according to the mapping relation between the RLOC, the EID and the segment routing label; generating a segment routing message according to the segment routing label and the LISP message; the segment routing message is returned to the source router so that the source router sends the segment routing message to the destination router. By the method, the RLOC and the EID in the LISP message can be replaced by the corresponding segment routing label, and the length of the segment routing label is far smaller than the lengths of the RLOC and the EID, so that the overhead of a forwarding plane can be reduced, and the load of a network can be reduced.

Description

Message transmission method and controller
Technical Field
The present invention relates to the field of networks, and in particular, to a message transmission method and a controller.
Background
The existing Internet is addressed based on a traditional IP (Internet Protocol) address, which is both an identity identifier and an address identifier, so that the IP address is semantically overloaded. LISP (Locator/IDSeparation Protocol) is a new name address system. It divides the IP address into RLOC (Routing Locator) and EID (Endpoint identifier). An operator can maintain a mapping table of RLOC and EID on a network edge router, map the EID into corresponding RLOC, add an RLOC address of an identification position in front of a user message to form an inner layer IP and an outer layer IP, and the edge router can forward the outer layer RLOC IP address in a core network. The method for mapping the ID IP address and the position ID IP address has obvious advantages in mobile IP, and as the user communication adopts the user ID IP address without concerning which IP address is used in network transmission, the continuous user session can be ensured, thereby solving the problem of disconnection caused by base station switching and user roaming.
LISP uses IP-in-IP (mobile IP data encapsulation and tunnel) to transmit, and includes 20 bytes of RLOC flag bits, 8 bytes of UDP (User Datagram Protocol) flag bits, 8 bytes of LISP header and 20 bytes of EID flag bits, so that the problem of too large overhead exists in the LISP forwarding plane.
Disclosure of Invention
One purpose of the present invention is to reduce the overhead of RLOC and EID in the LISP forwarding plane and reduce the network burden caused by the label.
According to an aspect of the present invention, a message transmission method is provided, including: the method comprises the steps that a controller obtains a LISP message from a source router, wherein the LISP message comprises RLOC and EID; determining a segment routing label according to the mapping relation between the RLOC, the EID and the segment routing label; generating a segment routing message according to the segment routing label and the LISP message; the segment routing message is returned to the source router so that the source router sends the segment routing message to the destination router.
Further, still include: the controller receives a segment routing message from a destination router, wherein the segment routing message comprises a segment routing label; determining the RLOC and the EID according to the mapping relation between the segment routing label and the RLOC and the EID; generating a LISP message according to the RLOC, the EID and the segment routing message; the LISP message is returned to the destination router.
Further, the segment routing labels comprise a first layer segment routing label and a second layer segment routing label; determining the segment routing label according to the mapping relationship between the RLOC and the EID and the segment routing label comprises the following steps: determining a first layer of segment routing labels according to the mapping relation between the RLOC and the segment routing labels; and determining a second layer routing label according to the mapping relation between the EID and the segment routing label.
Further, generating the segment routing message according to the segment routing label and the LISP message comprises: replacing the RLOC in the LISP message with a first tier routing label; the EID in the LISP message is replaced with the second layer segment routing label.
Further, still include: generating the segment routing message according to the segment routing label and the LISP message further comprises: and deleting the UDP identification bit and the LISP message header in the LISP message.
Further, the segment routing labels comprise a first layer segment routing label and a second layer segment routing label; determining the RLOC and the EID according to the mapping relation between the segment routing label and the RLOC and the EID comprises the following steps: determining RLOC according to the mapping relation between the first layer segment routing label and the RLOC; and determining the EID according to the mapping relation between the routing label of the second layer segment and the EID.
Further, generating the LISP message according to the RLOC, the EID, and the service data information includes: replacing the first layer segment routing label in the segment routing message with an RLOC; and replacing the second layer routing label in the segment routing message with the EID.
Further, generating the LISP message according to the RLOC, the EID, and the segment routing message further comprises: and adding UDP identification bits and LISP message headers in the segment routing messages.
By the method, the RLOC and the EID in the LISP message can be replaced by the corresponding segment routing label, and the length of the segment routing label is far smaller than the lengths of the RLOC and the EID, so that the overhead of a forwarding plane can be reduced, and the load of a network can be reduced.
According to another aspect of the present invention, there is provided a controller comprising: the LISP message acquisition module is used for acquiring a LISP message from a source router, wherein the LISP message comprises RLOC and EID; the segment routing label determining module is used for determining a segment routing label according to the mapping relation between the RLOC, the EID and the segment routing label; the segment routing message generating module is used for generating a segment routing message according to the segment routing label and the LISP message; and the segment routing message feedback module is used for returning the segment routing message to the source router so that the source router sends the segment routing message to the destination router.
Further, still include: a segment routing message obtaining module, configured to obtain a segment routing message from a destination router, where the segment routing message includes a segment routing label; the LISP identification acquisition module is used for determining the RLOC and the EID according to the mapping relation between the segment routing label and the RLOC and the EID; the LISP message generating module is used for generating the LISP message according to the RLOC, the EID and the segment routing message; and the LISP message feedback module is used for returning the LISP message to the destination router.
Further, the segment routing labels comprise a first layer segment routing label and a second layer segment routing label; the segment routing label determining module is specifically configured to: determining a first layer of segment routing labels according to the mapping relation between the RLOC and the segment routing labels; and determining a second layer routing label according to the mapping relation between the EID and the segment routing label.
Further, the segment routing message generating module is specifically configured to: replacing the RLOC in the LISP message with a first tier routing label; the EID in the LISP message is replaced with the second layer segment routing label.
Further, the segment routing message generating module is further configured to: and deleting the UDP identification bit and the LISP message header in the LISP message.
Further, the segment routing labels comprise a first layer segment routing label and a second layer segment routing label; the LISP identifier obtaining module is specifically configured to: determining RLOC according to the mapping relation between the first layer segment routing label and the RLOC; and determining the EID according to the mapping relation between the routing label of the second layer segment and the EID.
Further, the LISP message generating module is specifically configured to: replacing the first layer segment routing label in the segment routing message with an RLOC; and replacing the second layer routing label in the segment routing message with the EID.
Further, the LISP message generating module is specifically further configured to: and adding UDP identification bits and LISP message headers in the segment routing messages.
The controller can replace the RLOC and the EID in the LISP message with corresponding segment routing labels, and the length of the segment routing labels is far smaller than the lengths of the RLOC and the EID, so that the overhead of a forwarding plane can be reduced, and the burden of a network is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of an embodiment of a message transmission method of the present invention.
Fig. 2 is a schematic diagram of a segment routing message structure.
Fig. 3 is a flowchart of another embodiment of a message transmission method according to the present invention.
Fig. 4 is a flowchart of an embodiment of generating a segment routing message in the message transmission method according to the present invention.
Fig. 5 is a flowchart of an embodiment of generating a LISP message in the message transmission method of the present invention.
FIG. 6 is a schematic diagram of one embodiment of a controller of the present invention.
Fig. 7 is a schematic diagram of another embodiment of the controller of the present invention.
FIG. 8 is a schematic diagram of one embodiment of an application scenario for a controller of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
A flow diagram of one embodiment of a message transmission method of the present invention is shown in fig. 1.
In step 101, the controller obtains a LISP message from the source router, where the LISP message includes RLOC and EID, and occupies 40 bytes.
In step 102, the segment routing label is determined according to the mapping relationship between the RLOC and EID and the segment routing label.
In step 103, a segment routing message is generated from the segment routing label and the LISP message. A schematic diagram of the structure of the segment routing message is shown in fig. 2, and it can be seen that the two-layer label of the segment routing message has 5 bytes.
In step 104, the segment routing message is returned to the source router so that the source router sends the segment routing message to the destination router.
By the method, the RLOC and the EID in the LISP message can be replaced by the corresponding segment routing label, and the length of the segment routing label is far smaller than the lengths of the RLOC and the EID, so that the overhead of a forwarding plane can be reduced, and the load of a network can be reduced.
A flow chart of another embodiment of the message transmission method of the present invention is shown in fig. 3.
In step 301, the controller receives a segment routing message from a destination router, the segment routing message including a segment routing label.
In step 302, RLOC and EID are determined from the mapping of segment routing labels to RLOC and EID.
In step 303, a LISP message is generated from the RLOC, EID, and segment routing messages.
In step 304, the LISP message is returned to the destination router.
By the method, the segment routing message can be restored to the LISP message at the destination router end for continuous transmission, so that the problem that the obtained message cannot be analyzed by the next node needing to analyze the LISP message is avoided, the compatibility with the existing equipment and nodes is realized, and the practical application is facilitated.
In one embodiment, the segment routing label has a mapping relationship with the RLOC and the EID, respectively, and the first-layer segment routing label can be determined according to the mapping relationship of the RLOC and the segment routing label; and determining a second layer routing label according to the mapping relation between the EID and the segment routing label, so that the RLOC and the EID can be converted into a two-layer label of the segment routing message, and the network overhead is reduced while the information amount is not lost.
Similarly, the controller can reduce the two-layer labels of the segment routing message into the RLOC and the EID according to the same mapping relation, thereby avoiding that the next node which needs to analyze the LISP message can not analyze the acquired message, realizing the compatibility with the existing equipment and nodes, and being beneficial to practical application.
In one embodiment, the UDP identification bits and LISP header may be omitted due to the centralized control function of the controller. In the LISP message, the UDP identification bit and the LISP header occupy 16 bytes, so that the UDP identification bit and the LISP header can be omitted when generating the segment routing message, thereby reducing 16 bytes and further reducing network overhead.
Similarly, the controller can add the UDP identification bit and the LISP header when generating the LISP message from the segment routing message acquired from the destination router, so as to avoid that a node which needs to analyze the LISP message next cannot analyze the acquired message, thereby realizing compatibility with the existing devices and nodes and facilitating practical application.
A flow chart of one embodiment of generating a segment routing message in the message transmission method of the present invention is shown in fig. 4.
In step 401, the RLOC in the LISP message is replaced with the first tier routing label.
In step 402, the EID in the LISP message is replaced with the second layer segment routing label.
In step 403, the UDP identity and the LISP header of the user datagram protocol in the LISP message are deleted.
By the method, the LISP message can be converted into the segment routing message, a UDP identification bit and a LISP message header are omitted, the RLOC and the EID are mapped into the segment routing label, the number of bytes occupied by the label and the like is greatly reduced, the cost of a forwarding plane is reduced, and the network load is reduced.
Fig. 5 is a flowchart of an embodiment of generating a LISP message in the message transmission method according to the present invention.
In step 501, the first layer segment routing label in the segment routing message is replaced with an RLOC.
In step 502, the second layer segment routing label in the segment routing message is replaced with the EID.
In step 503, a user datagram protocol UDP identification bit and a LISP header are added to the segment routing message.
By the method, the segment routing message which is forwarded at the forwarding plane is converted into the LISP message which can be analyzed by the LISP router again, so that the cost of the forwarding plane is reduced, the network burden is reduced, the compatibility with the existing equipment and nodes is realized, and the practical application is facilitated.
A schematic diagram of one embodiment of the controller of the present invention is shown in fig. 6. The LISP message acquiring module 601 can acquire a LISP message from the source router, where the LISP message includes RLOC and EID, and occupies 40 bytes. The segment routing label determining module 602 can determine the segment routing label according to the mapping relationship between the RLOC and the EID and the segment routing label. The segment routing message generation module 603 can generate a segment routing message from the segment routing label and the LISP message. The segment routing message feedback module 604 can return the segment routing message to the source router so that the source router sends the segment routing message to the destination router.
The controller can replace the RLOC and the EID in the LISP message with corresponding segment routing labels, and the length of the segment routing labels is far smaller than the lengths of the RLOC and the EID, so that the overhead of a forwarding plane can be reduced, and the burden of a network is reduced.
A schematic diagram of another embodiment of the controller of the present invention is shown in fig. 7. The segment routing message obtaining module 701 is capable of receiving a segment routing message from a destination router, where the segment routing message includes a segment routing label. The LISP identity obtaining module 702 can determine the RLOC and the EID according to the mapping relationship between the segment routing label and the RLOC and the EID. The LISP message generation module 703 can generate a LISP message from the RLOC, EID, and segment routing messages. LISP message feedback module 704 can return the LISP message to the destination router.
The controller realizes that the segment routing message is restored into the LISP message at the destination router end for continuous transmission, thereby avoiding that the next node needing to analyze the LISP message can not analyze the acquired message, realizing the compatibility with the existing equipment and nodes and being beneficial to practical application.
In one embodiment, the segment routing label has a mapping relationship with the RLOC and the EID, respectively, and the segment routing label determining module 602 can determine the first-layer segment routing label according to the mapping relationship between the RLOC and the segment routing label; determining a second layer routing label according to the mapping relation between the EID and the segment routing label; the segment routing message generation module 603 can convert RLOC and EID into two-layer labels of the segment routing message, thereby reducing network overhead without losing information amount.
Similarly, the LISP identifier obtaining module 702 can determine RLOC according to the mapping relationship between the first tier segment routing tag and RLOC; and determining the EID according to the mapping relation between the routing label of the second layer segment and the EID. The LISP message generating module 703 converts the two-layer label of the segment routing message into RLOC and EID, and generates a LISP message, thereby avoiding that a node that needs to analyze the LISP message next cannot analyze the acquired message, thereby realizing compatibility with the existing devices and nodes, and facilitating practical application.
In one embodiment, segment routing message generation module 603 may omit the UDP identification bits and LISP header due to the centralized control function of the controller. In the LISP message, the UDP identification bit and the LISP header occupy 16 bytes, so that the UDP identification bit and the LISP header can be omitted when generating the segment routing message, thereby reducing 16 bytes and further reducing network overhead.
Similarly, the LISP message generating module 703 can add the UDP identification bit and the LISP header when generating the LISP message from the segment routing message, so as to avoid that a node that needs to analyze the LISP message next cannot analyze the acquired message, thereby implementing compatibility with the existing device and node, and facilitating practical application.
A schematic diagram of one embodiment of an application scenario of the controller of the present invention is shown in fig. 8.
In 801, a source user sends a message, which may be generated via a LISP router. The LISP message includes RLOC and EID. The LISP message arrives at the source router at the edge of the forwarding plane.
In 802, the source router sends a LISP message to an SDN (Software Defined Network) controller. And the SDN controller simplifies the labels according to the corresponding relation between the segment routing labels and the RLOC and the EID, maps the RLOC and the EID into two layers of labels of the segment routing message, simplifies and deletes the UDP identifier and the LISP message header, and generates the segment routing message.
In 803, the SDN controller feeds back the segment routing message to the source router.
At 804, the source router forwards the segment routing message on the forwarding plane to a destination router at an edge location of the forwarding plane.
In 805, the destination router sends a segment routing message to the SDN controller. And the SDN controller restores the two-layer labels of the segment routing message into RLOC and EID according to the same mapping relation, and adds UDP (user Datagram protocol) identification and LISP (locator identity) header to generate the LISP message.
At 806, the SDN controller returns a LISP message to the destination router.
In 807, the destination router sends the LISP message to the destination LISP router, which parses it and sends it to the destination user.
The controller can convert the RLOC and EID of the LISP message into two layers of labels of the segment routing message at a sending end, so that the occupied bytes of the labels are reduced, and UDP (user Datagram protocol) identification and LISP header are omitted, thereby reducing the network overhead of a forwarding plane; at the receiving end, the controller can restore the two-layer label of the segment routing message to RLOC and EID again, and restore UDP identifier and LISP header, thereby realizing the compatibility with the existing equipment and network and facilitating the practical application.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims (10)

1. A method for message transmission, comprising:
the method comprises the steps that a controller obtains an identity identifier and a location separation protocol (LISP) message from a source router, wherein the LISP message comprises a routing location RLOC and a terminal identifier EID;
determining the segment routing label according to the mapping relationship between the RLOC, the EID and the segment routing label, including: determining a first layer of segment routing labels according to the mapping relation between the RLOC and the segment routing labels; determining a second layer routing label according to the mapping relation between the EID and the segment routing label; wherein the segment routing labels comprise a first layer segment routing label and a second layer segment routing label;
generating a segment routing message according to the segment routing label and the LISP message, including: replacing the RLOC in the LISP message with the first tier routing label; replacing the EID in the LISP message with the second layer segment routing label; deleting a User Datagram Protocol (UDP) identification bit and a LISP message header in the LISP message;
returning the segment routing message to the source router for the source router to send the segment routing message to a destination router.
2. The method of claim 1, further comprising:
the controller receives a segment routing message from the destination router, wherein the segment routing message comprises a segment routing label;
determining the RLOC and the EID according to the mapping relation of the segment routing label and the RLOC and the EID;
generating the LISP message from the RLOC, the EID, and the segment routing message;
and returning the LISP message to the destination router.
3. The method of claim 2,
the segment routing labels comprise a first layer segment routing label and a second layer segment routing label;
the determining the RLOC and the EID according to the mapping relation between the segment routing label and the RLOC and the EID comprises:
determining the RLOC according to the mapping relation between the first layer segment routing label and the RLOC;
and determining the EID according to the mapping relation between the second layer routing label and the EID.
4. The method of claim 3,
generating an identity separation protocol, LISP, message from the RLOC, the EID, and the segment routing message comprises:
replacing the first layer segment routing label in the segment routing message with the RLOC;
replacing the second layer segment routing label in the segment routing message with the EID.
5. The method of claim 4, wherein generating the LISP message from the RLOC, the EID, and the segment routing message further comprises:
and adding UDP identification bits and LISP message headers in the segment routing messages.
6. A controller, comprising:
an identity separation protocol (LISP) message acquisition module, configured to acquire a LISP message from a source router, where the LISP message includes a routing location RLOC and a terminal identity (EID);
a segment routing label determining module, configured to determine a segment routing label according to the mapping relationship between the RLOC, the EID, and the segment routing label, where the segment routing label determining module includes: determining a first layer of segment routing labels according to the mapping relation between the RLOC and the segment routing labels; determining a second layer routing label according to the mapping relation between the EID and the segment routing label; wherein the segment routing labels comprise a first layer segment routing label and a second layer segment routing label;
a segment routing message generating module, configured to generate a segment routing message according to the segment routing label and the LISP message, including: replacing the RLOC in the LISP message with the first tier routing label; replacing the EID in the LISP message with the second layer segment routing label; deleting a User Datagram Protocol (UDP) identification bit and a LISP message header in the LISP message;
and the segment routing message feedback module is used for returning the segment routing message to the source router so that the source router can send the segment routing message to the destination router.
7. The controller of claim 6, further comprising:
a segment routing message obtaining module, configured to obtain a segment routing message from the destination router, where the segment routing message includes a segment routing label;
a LISP identifier obtaining module, configured to determine, according to a mapping relationship between the segment routing label and a routing location RLOC and a terminal identifier EID, the RLOC and the EID;
a LISP message generating module, configured to generate a LISP message according to the RLOC, the EID, and the segment routing message;
and the LISP message feedback module is used for returning the LISP message to the destination router.
8. The controller of claim 7,
the segment routing labels comprise a first layer segment routing label and a second layer segment routing label;
the LISP identity acquisition module is specifically configured to:
determining the RLOC according to the mapping relation between the first layer segment routing label and the RLOC;
and determining the EID according to the mapping relation between the second layer routing label and the EID.
9. The controller of claim 8,
the LISP message generation module is specifically configured to:
replacing the first layer segment routing label in the segment routing message with the RLOC;
replacing the second layer segment routing label in the segment routing message with the EID.
10. The controller according to claim 9, wherein the LISP message generating module is further specifically configured to:
and adding UDP identification bits and LISP message headers in the segment routing messages.
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