Method and point for selecting multi-protocol label switching traffic engineering bypass tunnel

A multi-protocol label and traffic engineering technology, applied in the field of selecting multi-protocol label switching traffic engineering bypass tunnels and nodes, can solve the problem that the main tunnel cannot be created or a more reliable Bypass tunnel can be selected, the main tunnel cannot be created or a specified path bypass tunnel can be selected , the main tunnel cannot be created or the Bypass tunnel with lower latency is preferred

Active Publication Date: 2013-06-19
XINHUASAN INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0034] The main tunnel cannot be created or the Bypass tunnel with lower latency is preferred;
[0035] The main tunnel cannot create or prefer a more reliable Bypass tunnel;
[0036] The main tunnel cannot create or prefer the Bypass tunnel with the specified path;

Method used

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  • Method and point for selecting multi-protocol label switching traffic engineering bypass tunnel
  • Method and point for selecting multi-protocol label switching traffic engineering bypass tunnel
  • Method and point for selecting multi-protocol label switching traffic engineering bypass tunnel

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0141] Figure 8 The flow chart of the method for selecting the Bypass tunnel when the head node of the main tunnel has requirements for the delay, reliability and CT of the Bypass tunnel provided by Embodiment 2 of the present invention, as shown in Figure 8 As shown, the specific steps are as follows:

[0142] Step 801: The head node of the TE main tunnel determines the strategy for selecting the Bypass tunnel. The strategy indicates that there are requirements for the delay, reliability and CT of the Bypass tunnel. Then add the FACILITY_BACKUP_CONTROL object to the Path message and fill the object according to the delay requirement. Fill in the TOS field and Delay field of the object according to the reliability requirements, fill in the CT field of the object according to the CT requirements, and fill in the Interval, Number, and Multiple field values ​​​​of the object at the same time, and send the Path message.

[0143] Step 802: The PLR ​​receives the Path message, re...

application example 1

[0203] Such as Figure 13As shown in the figure, the main TE tunnel is Tunnel1, and the path is H->A->B->C. One FRR backup tunnel is Tunnel2, and the path is A->E->C; the other FRR backup tunnel is Tunnel3, and the path is A->D->C. The bypass tunnel of the current TE main tunnel Tunnel1 is Tunnel2.

[0204] If you configure the strategy of choosing the bypass tunnel as the main tunnel, the delay of the bypass tunnel should not exceed 150 ms and high reliability. At this time, the head node H of the Tunnel1 tunnel will send a Path message carrying the FACILITY_BACKUP_CONTROL object. The content of the object is as follows Figure 14 shown. Each field is parsed as follows:

[0205] TOS: 0xa, the strategy for creating or optimizing Bypass tunnels is delay and high reliability.

[0206] Delay: 0x96, the delay of the Bypass tunnel should be less than 150ms.

[0207] Number: The PLR ​​needs to detect three times when obtaining each set of data of each FRR backup tunnel.

[02...

application example 2

[0216] Such as Figure 15 As shown, the protected LSP (Protected LSP) is: R1–>R2–>R3–>R4–>R5–>R10, and there are three FRR backup tunnels for the main tunnel. : The Bypass tunnel needs to go through nodes R9 and R11. In this way, the head node R1 puts the FRR domain identifiers and IP addresses of nodes R9 and R11 into the Subobjects field of the FACILITY_BACKUP_CONTROL object of the Path message, and sends the Path message out.

[0217] Subobjects fields such as Figure 16 shown.

[0218] After receiving the Path message, PLR R2 performs the following processing:

[0219] Step 01: R2 reads the IP address of the first subobject node R9 from the Subobject field of the FACILITY_BACKUP_CONTROL object of the Path message, and then searches the local LSPDB for the R9 node, and finds that the R9 node is in the same FRR domain as itself, then the PLR ​​R2 will The IP addresses of all subobject nodes belonging to the FRR domain are stripped from the Subobjects field of the Path mes...

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Abstract

The invention discloses a method and a point for selecting a multi-protocol label switching traffic engineering bypass tunnel. The method includes that a point of local repair (PLR) receives a path message sent by a head point of a traffic engineering (TE) main tunnel; and according to a bypass tunnel selecting strategy carried in the message, the bypass tunnel which meets the strategy is selected from an existing fast reroute (FRR) back-up tunnel, and the strategy indication requires for one of four factors of time delay of the bypass tunnel, reliability of the bypass tunnel, the bandwidth class type (CT) of the bypass tunnel and points required to be passed by the bypass tunnel or any combination of the four factors. The method is capable of selecting the bypass tunnel according to the time delay, the reliability, the bandwidth CT and the points required to be passed by the bypass tunnel or any combination.

Description

technical field [0001] The present invention relates to the technical field of Multi-Protocol Label Switching (MPLS, Multi-Protocol Label Switching), in particular to a method for selecting an MPLS traffic engineering (TE, Traffic Engineering) bypass tunnel and a local repair node (PLR, Point of Local Repair), head node. Background technique [0002] MPLS is a backbone network technology widely used at present. MPLS introduces the concept of connection-oriented label switching on the connectionless Internet Protocol (IP, Internet Protocol) network, combines the three-layer routing technology and the two-layer switching technology, and gives full play to the flexibility of IP routing and the simplicity of two-layer switching sex. [0003] Network congestion is the main problem affecting the performance of the backbone network. The cause of congestion may be insufficient network resources, or local congestion caused by unbalanced network resource load. TE can be used to sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/707H04L12/46H04L45/24
Inventor 赵昌峰
Owner XINHUASAN INFORMATION TECH CO LTD
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