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Method and apparatus for clearing residual LSP banding

A local configuration, local technology, applied in the direction of digital transmission system, electrical components, transmission system, etc.

Active Publication Date: 2009-01-21
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] pass figure 1 The processing process shown can complete the synchronization and update of LSP fragments, but this processing method is likely to lead to the generation of black hole routing

Method used

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  • Method and apparatus for clearing residual LSP banding
  • Method and apparatus for clearing residual LSP banding
  • Method and apparatus for clearing residual LSP banding

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0034] According to the LSP fragment extension technology stipulated in the RFC3786 protocol, it can be known that the 0th LSP fragment (LSP Number=0) released by the initial system and the virtual system will carry an intermediate system alias identifier length type value (IS Alias ​​ID TLV) field. The format of the IS Alias ​​ID TLV field is shown in Table 2, including a 6-byte initial system ID (Normal system-id), a 1-byte pseudo node number (Pseudonode number), and a 1-byte sub-TLV length (Sub- TLVs length) and sub-TLV values ​​(Sub-TLVs) of 0 to 247 bytes.

[0035]

[0036] Table 2

[0037] image 3 A schematic diagram of a link state information base composed of LSP fragments is shown. Depend on image 3 It can be seen that the Source ID i...

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Abstract

The invention discloses a method for cleaning the residual LSP fragmentation and a device thereof. The method comprises: after receiving the LSP fragmentation, a router judges if the Source-ID carried by the LSP fragmentation matches with any of the initial system ID and the additional system ID configured locally; if the matched ID exists, the processing flow which corresponds to receiving the LSP fragmentation sent by the local system is carried out; if the matching fails, when LSP fragmentation received is the first LSP fragmentation, the Normal system-id carried on the first 0 LSP fragmentation is judged if the Normal system-id is equal to the initial system ID configured locally, if two ID are same, the LSP fragmentation received is defined as the residual LSP fragmentation, and the entire network is informed to clean the LSP fragmentation; otherwise, the processing flow which corresponds to receiving the LSP fragmentation sent by other systems is carried out. The invention can promptly clean the residual LSP fragmentation on the network, thereby preventing from generating the black hole router.

Description

technical field [0001] The present invention relates to the routing technology in the communication network, especially relates to clearing the residual link status in the network running Intermediate System-to-Intermediate System intra-domain routing information exchange protocol (IS-IS, Intermediate System-to-Intermediate System intra-domain routing information exchange protocol) A protocol data unit (LSP, Link State Protocol Data Unit) fragmentation method and device. Background technique [0002] IS-IS is an interior gateway protocol based on the Shortest Path First (SPF, Shortest Path First) algorithm. It uses LSPs to diffuse link state information to ensure that the link state information of routers on the entire network is synchronized. Since the link state information may be very large, the protocol provides a fragmentation method to fragment the LSP. Each LSP fragment carries an LSP identifier (LSP-ID), which is used to uniquely identify the LSP fragment. Table 1 ...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L29/06H04L12/721
Inventor 宋新超钱雪彪魏志广张蓓
Owner NEW H3C TECH CO LTD
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