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Open shortest path first (OSPF) protocol graceful restarting method and device

A smooth restart and smooth start technology, applied in the field of communication, can solve problems such as data flow interruption, and achieve the effect of reducing interruption and GR failure

Active Publication Date: 2012-01-18
XINHUASAN INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, if an LSA update occurs during the GR process, the GR will be declared as a failure, which will cause interruption of the data flow not related to the updated LSA.

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  • Open shortest path first (OSPF) protocol graceful restarting method and device
  • Open shortest path first (OSPF) protocol graceful restarting method and device
  • Open shortest path first (OSPF) protocol graceful restarting method and device

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Embodiment Construction

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and examples.

[0028] see Figure 4 , Figure 4 It is a flow chart of the OSPF protocol smooth restart method according to the embodiment of the present invention, including the following steps:

[0029] Step 401. During the GR process, when the smooth start assisting device GR Helper detects an LSA update, it determines whether the LSA update can cause a network topology change, and if so, notifies the GRRestarter that the GR failed this time, and if not, stores the updated information. LSA.

[0030] In practical applications, when the GR helper receives an LSA from a neighbor router, it compares the LSA with the corresponding LSA in the local LSDB to determine whether an LSA update has occurred. If an update occurs, the GR fails. In this s...

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Abstract

The invention provides an open shortest path first (OSPF) protocol graceful restarting method and an OSPF protocol graceful restarting device. The method comprises that: in a graceful restarting (GR) process, a GR Helper judges whether link state advertisement (LSA) update can cause a network topology change or not when detecting the LSA update, and stores updated LSA if the LSA update cannot cause the network topology change; and after the GR is finished, the GR Helper floods the stored updated LSA to a graceful Restarter. By the method and the device, GR failures caused by the LSA update can be reduced, and interrupts, caused by the GR failures, of data streams unrelated to the updated LSA further can be reduced.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to an Open Shortest Path First (OSPF) protocol Graceful Restart (GR) method and device. Background technique [0002] The OSPF protocol is a Border Gateway Protocol (IGP) for routing decisions within a single autonomous system. OSPF routers discover neighbors through Hello packets, advertise link status to each other with neighbor routers, establish a link state database (LSDB), generate a shortest path tree, and use the shortest path to construct a routing forwarding table. [0003] When the router restarts the OSPF protocol, it will resend Hello packets to discover neighbors. see figure 1 , figure 1 It is a schematic diagram of OSPF protocol networking, in which router R2 and routers R1, R3, and R4 are neighbors respectively. When R1 restarts the OSPF protocol, it will send a Hello message to discover its neighbors, and R2 has established a neighbor relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L45/02
Inventor 陆亦雄孙蕊
Owner XINHUASAN INFORMATION TECH CO LTD
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