Method, apparatus and system for rapid rerouting

A routing and fast technology, applied in the field of communication, can solve the problems such as the inability to support VPNFRR in the domain, and achieve the effect of simple solution and convenient implementation.

Active Publication Date: 2009-07-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the conflict between the two rules, the curr

Method used

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  • Method, apparatus and system for rapid rerouting
  • Method, apparatus and system for rapid rerouting
  • Method, apparatus and system for rapid rerouting

Examples

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Embodiment Construction

[0021] exist figure 1 In the scenario shown, ASBR is located at the edge of the system and provides routing services for different autonomous domains. PE provides routing services for user equipment to access the network, and CE provides routing services for user equipment. Route reflection exists between ASBR1, PE1, and PE2. RR, when ASBR1 receives the routing information of CE1 sent from PE1 and PE2, ASBR1 prefers the routing information of CE1 sent by one of the links. When the link fails or the PE on the link fails, in order to make ASBR1 It can be switched to another link to realize the VPN FRR function, and the embodiment of the present invention provides a fast rerouting method.

[0022] Combine below figure 2 The fast rerouting method described in the embodiment of the present invention is further introduced.

[0023] Such as figure 2 As shown, the method includes:

[0024] 201. Configure different router identifiers for the first provider edge router and the sec...

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Abstract

The embodiment of the invention discloses a quick rerouting method, a quick rerouting device and a quick rerouting system. In the embodiment of the invention, a first service provider edge router and a second service provider edge router are firstly configured with different router identifiers; and after routing information passes through a routing reflector, the router identifiers of the service provider edge routers are modified, thus leading the router identifiers of the first service provider edge router and the second service provider edge router to be consistent. By adopting the technical proposal provided by the embodiment of the invention, the VPN FRR can be supported in domain when the reflector exists between PE and ASBR in a CE double return PE scene. The technical proposal provided by the embodiment of the invention only needs ASBR to support the technique and does not make any modification to other nodes, thus having simple implementation.

Description

technical field [0001] The present invention relates to the communication field, in particular to a fast rerouting method, device and system. Background technique [0002] In the CE (Customer Edge router, user edge router) dual-homing PE (Provider Edgerouter, service provider edge router) scenario, ASBR (Autonomous SystemBoundary Router, autonomous system boundary router) needs to support VPN (Virtual Private Network, virtual personal Network) FRR (Fast Re-routing, fast rerouting). [0003] Such as figure 1 As shown in the figure, ASBR1 receives the routing information of CE1 sent from PE1 and PE2. The routing information can be a VPNv4 route or a VPNv6 route. ASBR1 prefers the routing information of CE1 sent from PE1. The link between PE1 and ASBR1 is faulty. Or when the PE1 router fails, ASBR1 switches to the link between ASBR1 and PE2 to implement the VPN FRR function. [0004] However, if PE1 and PE2 advertise the routing prefix of the same VPN with different RDs (Rou...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L12/46H04L45/28
Inventor 陈双龙许丹诚樊磊徐海军
Owner HUAWEI TECH CO LTD
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