Routing device and its grace ful restart method

A smooth restart and routing technology, applied in the field of network communication, can solve problems such as long topology convergence time, inability to correctly reflect network topology changes, and protocol mutual waiting

Active Publication Date: 2007-11-14
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method has certain problems, such as: 1. Prolonging the ISIS GR time will lead to a long topology convergence time, so it cannot correctly reflect the network topology changes

Method used

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  • Routing device and its grace ful restart method
  • Routing device and its grace ful restart method
  • Routing device and its grace ful restart method

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Embodiment Construction

[0031] As mentioned above, the basic idea of ​​the present invention is to let the ISIS protocol unit on the routing device know the routing protocol type of each LSP in its LSDB through a certain mechanism, so that ISIS can start updating after completing GR and confirming that the imported routing protocol has completed GR Corresponding LSPs. In this way, even if the GR process of ISIS is faster than the GR of its imported routing protocol, it can still effectively avoid route flapping caused by imported routes during the GR process.

[0032] The above and other technical features and beneficial effects of the present invention will be more fully explained through the following description of preferred embodiments with reference to the accompanying drawings. First please refer to FIG. 2 , which is a schematic structural diagram of a preferred embodiment of the routing device of the present invention.

[0033] As shown in Figure 2, the routing device 100 provided by the pres...

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Abstract

The route device includes route management unit and ISIS protocol unit. Virtual ID assignment table in use for coincidence relation between pointed route protocol and virtual ID assignment range is configured in ISIS protocol unit. When ISIS protocol unit generates LSP, the coincidence relation is in use for setting up restriction for taken value of virtual ID based on type of protocol of LSP. Moreover, when receiving LSP, the coincidence relation is standard of judgment based on virtual ID to determine protocol type of LSP. The invention also discloses smoothing restarting method, which expands current well-known smoothing restarting methods. The invention requires that after accomplishing GR and after determining that the introduced other route protocols also accomplish GR, the said ISIS protocol unit just starts to update LSP corresponding to other route protocols. The invention solves issue of topology concussion of network route caused by introduced routes in GR procedure effectively.

Description

technical field [0001] The invention belongs to the technical field of network communication, relates to a routing technology in a communication network, in particular to a routing device and a smooth restart method applied thereto. Background technique [0002] ISIS (Intermediate System to Intermediate System, Intermediate System Interconnection) is an IGP (Internal Gateway Protocol, Internal Gateway Protocol) routing protocol based on the SPF (Shortest Path First, shortest path first) algorithm, which uses LSP (LabelSwitching Path, label switching Path) carries related routing and topology information, and performs route calculation according to an LSDB (Link State Database, Link State Database) composed of LSPs. ISIS requires all routers in the same routing domain to maintain exactly the same LSDB to ensure that the calculated routes are loop-free. [0003] GR (Graceful Restart) is applied to devices that separate the control plane and data plane to ensure uninterrupted ...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L29/06H04L45/02
Inventor 李亚军杨帆
Owner NEW H3C TECH CO LTD
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