Message forwarding method and device

Abstract

The present invention provides a message forwarding method and device, wherein the method includes: the first service provider edge equipment PE determines the common path of the primary next-hop PE and the standby next-hop PE to the user edge equipment CE After a fault occurs on the path, determine the PE that detects the fault later among the active next-hop PE and backup next-hop PE; the first PE forwards the PE that detects the fault after the packet to be sent to the CE passes to the CE. The present invention can solve the routing black hole problem in the related technology, avoid service interruption, and achieve the effect of ensuring the successful forwarding of messages.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a message forwarding method and device. Background technique [0002] In the IP-based wireless access network (Internet Protocol Radio Access Network, referred to as IPRAN) bearer solution currently adopted by the packet transport network for domestic mobile backhaul services, the network topology usually adopts a ring network at the access layer, and the aggregation The layer adopts a word-shaped network, and the simplified network diagram is as follows figure 1 shown. Among them, A1-A3 are access layer devices, and PE1-PE4 are aggregation layer devices. In terms of service deployment, the base station backhaul service usually adopts a PseudoWire (PseudoWire, referred to as PW) + Layer 3 Virtual Private Network (Layer 3Virtual Private Network, referred to as L3VPN) bridging solution. The access layer mainly deploys PW Fast Re-Route (Fast Re-Route, referred to as FRR), the c...

AI Technical Summary

Problems solved by technology

In the opposite direction, the route from PE1 to PE3 cannot form LDP FRR. Although the route from PE2 to PE3 can form LDP FRR on PE2, because IP routes are forwarded hop by hop, the next hop of the main route from PE2 to PE3 is PE1, and The route from PE1 to PE3 cannot form LDP FRR, so the end-to-end FRR protection cannot be formed from PE2 to PE3

In this way, the bidirectional forwarding detection (Bidirectional Forwarding Detection, referred to as PEER BFD) for detecting the connectivity of the L3VPN FRR primary and backup routes from PE3 to PE1 and PE2, in the direction of PE3→PE1 / PE2, has the outer layer LDP FRR for LSP protection, and PE1 / PE2 In the direction of PE2→PE3, there is no LDP FRR on the outer layer, so it cannot be protected

Since the PEER BFD session is bidirectional, packet loss in either direction will cause PEER BFD to be interrupted

Therefore, when the PE3-PE1 link fails, the active and standby PEER BFDs will be interrupted, and the forwarding layer of the L3VPN FRR active and standby routes from PE3 to PE1 and PE2 will be disabled, resulting in routing black holes, resulting in service interruption

[0012] For the routing black hole problem in related technologies, no effective solution has been proposed so far

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