Routing device and its graceful restart method

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

Active Publication Date: 2009-10-21
NEW H3C TECH CO LTD
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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 for a long period of time; 2. Let ISIS wait for other protocols to complete GR After the LSP is updated, there may be a mutual waiting phenomenon of the protocol, that is, a deadlock

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  • Routing device and its graceful restart method
  • Routing device and its graceful restart method
  • Routing device and its graceful restart method

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Embodiment Construction

[0032] 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.

[0033] 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. See first figure 2 , which is a schematic structural diagram of a best embodiment of the routing device of the present invention.

[0034] Such as figure 2 As shown, the routing device 100 provided by the present in...

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Abstract

The invention relates to network communication technology and discloses a routing device. The routing device includes a routing management unit and an ISIS protocol unit, wherein the ISIS protocol unit is configured with a virtual ID allocation table for specifying the corresponding relationship between routing protocols and virtual ID allocation ranges. This correspondence is not only used as a value constraint for the virtual ID to be set according to the type of the routing protocol to which the ISIS protocol unit generates the LSP, but also used as a criterion for determining the type of the routing protocol to which the LSP belongs according to the virtual ID when receiving the LSP. In addition, the present invention also discloses a smooth restart method, which extends the existing known smooth restart method, requiring the ISIS protocol unit to start updating after completing GR and confirming that other routing protocols introduced by it also complete GR The LSPs on it that correspond to these other routing protocols. The invention can effectively solve the network routing topology oscillation problem caused by imported routes in the GR process.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L29/06H04L45/02
Inventor 李亚军杨帆
Owner NEW H3C TECH CO LTD
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