Routing convergence method, provider edge devices and virtual private network system

Abstract

The invention provides a routing convergence method, provider edge devices and a virtual private network system, which belongs to the field of communication. The routing convergence method is used for a customer edge device dualhoming network, a second customer edge device dualhoming network is accessed into a second provider edge device and a third provider edge device, and the method comprises the following steps: the second provider edge device detects a link fault between the second provider edge device and the second customer edge device; and the second provider edge device is used for forwarding the received destination address as the routing message for the second customer edge device to third provider edge device, and then the third provider edge device is used for forwarding the routing message to the second customer edge device. The embodiment of the invention can realize the rapid convergence of the service flow in the CE dualhoming network when the PE-CE link fails. The technical scheme can be applied to the virtual private network.

Description

technical field [0001] The invention relates to the communication field, in particular to a route convergence method, an operator edge device and a virtual private network system. Background technique [0002] A virtual private network (Virtual Private Network, hereinafter referred to as VPN) is a collection of network nodes that establish private communication on a shared backbone network. The current VPN implementation method is mainly that a network service provider deploys a VPN service based on Multi-Protocol Label Switching (MPLS for short) for one or more user sites. [0003] Such as figure 1 As shown, through the VPN fast rerouting (hereinafter referred to as FRR) technology, when any node on the primary path PE1-P1-PE2 fails, the provider edge device (Provider Edge, hereinafter referred to as PE) 1 will quickly switch the traffic to the backup path PE1 -P2-PE2, to send the routing message to a customer edge device (Customer Edge, CE for short). When PE2 fails, PE...

AI Technical Summary

Problems solved by technology

After PE1 receives the routing update information, it will re-converge and select PE1-P2-PE3-CE2 as the new forwarding path. However, only relying on protocol convergence, the time for PE1 to re-converge to the new path is relatively long (more than 1s).

During the convergence process of PE1, since the path from PE1 to CE2 is still PE1-P1-PE2-CE2, when PE1 receives traffic destined for CE2 from CE1, it will add an outer label to P1, and the traffic is on P1. After label switching, the link to PE2 is faulty, and there is no route to CE2 on PE2. The traffic is discarded on PE2, resulting in the loss of service traffic to CE2, which slows down the end-to-end service convergence.

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