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OSPF (Open Shortest Path First) protocol-based graceful restart (GR) method and router

A graceful restart, router technology, applied in the field of communication, can solve the problems of inability to identify, VLINK and SHAMLINKINK neighbors disconnected, user traffic loss, etc., to achieve the effect of uninterrupted traffic

Active Publication Date: 2012-07-04
XINHUASAN INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When a router performs active-standby switchover and performs OSPF Graceful Restart (GR), the LSDB on the router will be cleared, causing the router to fail to recognize the VLINK and SHAMLINK Neighbors cut off
Similar SHAMLINK of OSPF will lead to the disconnection of neighbors during the GR process for the same reason
If the VLINK neighbor is disconnected, the backbone area connected through the VLINK will no longer be continuous, or the Area Border Router (ABR) with VLINK no longer has the ABR function and cannot calculate the three types of LSA. If the SHAMLINK neighbor is disconnected It will result in failure to restore type 1 LSA, so that the backdoor link is no longer the preferred backbone network for OSPF routing.
The above two situations will lead to the change of OSPF route, resulting in the loss of user traffic.

Method used

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  • OSPF (Open Shortest Path First) protocol-based graceful restart (GR) method and router
  • OSPF (Open Shortest Path First) protocol-based graceful restart (GR) method and router
  • OSPF (Open Shortest Path First) protocol-based graceful restart (GR) method and router

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention clearer, the solutions of the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0017] The present invention proposes a smooth restart method based on the OSPF protocol. When the OSPF protocol is normal, the neighbor information is recorded in real time, and the neighbor information is recorded in a storage space, which can be a disk or a memory. The specific implementation is determined according to the specific situation. .

[0018] see figure 1 , figure 1 It is a schematic diagram of a smooth restart process in an embodiment of the present invention. The specific steps are:

[0019] Step 101 , after the router restarts, according to the recorded neighbor information, send a packet entering the GR process to the neighbor corresponding to the neighbor information in the record to maintain the neighbor relations...

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Abstract

The invention discloses an OSPF (Open the Shortest Path First) protocol-based graceful restart (GR) method and a router. The method comprises the following steps of: recording neighbor information in real time, restarting the router, then, carrying out a GR process according to the recorded neighbor information, informing neighbors corresponding to the recorded neighbor information to maintain a neighbor relationship, and informing the neighbors corresponding to the recorded neighbor information to finish the GR process and enter a normal OSPF process after the LSDB (Link State Database) synchronization is finished. Based on the same method, the invention further provides the router, so that the uninterrupted flow in the GR process is guaranteed.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an OSPF protocol-based smooth restart method and a router. Background technique [0002] Open Shortest Path First (Open Shortest Path First, OSPF) is a link-state-based dynamic routing protocol proposed by IETF in 1988. It is a protocol for discovering routes and calculating routes on computer networks. In current network applications, there are often dozens or even hundreds of routers in an OSPF area, that is, dozens or even hundreds of routers maintain a link state database at the same time. When a link changes, all links The shortest path first algorithm will be run to recalculate the route. [0003] When a router performs active-standby switchover and performs OSPF Graceful Restart (GR), the LSDB on the router will be cleared, causing the router to fail to recognize the VLINK and SHAMLINK Neighbors broke. The similar OSPF SHAMLINK also causes the neighbor to be disco...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L45/28H04L45/02H04L45/60
Inventor 林长望罗国兵冯晓栋王海
Owner XINHUASAN INFORMATION TECH CO LTD
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