A message forwarding method and device in a dual-homing network based on mpls L3VPN

Abstract

The invention provides a message forwarding method and message forwarding equipment for multi-protocol label switching (MPLS) layer 3 virtual private network (L3VPN)-based for dual-homing networking. The method comprises the following steps of: when a link bearing a public network channel between local provider edge (PE) equipment and opposite-end PE equipment is detected to fail, calculating an optimal route to the opposite-end PE equipment and an optimal route from another piece of PE equipment in a mutual multi-homing relationship with the local PE equipment to the opposite-end PE equipment; and if the optimal route from the another PE equipment to the opposite-end PE equipment is superior to the optimal route from the local PE equipment to the opposite-end PE equipment, informing local customer edge (CE) equipment that the link bearing the public network channel between the local PE equipment and the opposite-end PE equipment fails, so that the local CE equipment forwards a message from the another PE equipment. The message can be forwarded along an optimal path.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a message forwarding method in a dual-homing network based on multi-protocol label switching (Multi-protocol Label Switching, MPLS) three-layer virtual private network (Layer 3 Virtual Private Network, L3VPN) and equipment. Background technique [0002] The dual-homing network in MPLS L3VPN provides two primary and secondary paths for packet forwarding. Under normal circumstances, packets are forwarded through the primary path. If the primary path fails, packets will be forwarded through the backup path. Ability to avoid business interruption. [0003] see figure 1 , figure 1 It is a schematic diagram of dual-homing network in MPLS L3VPN, including customer edge equipment (Custom Edge, CE): CE1, CE2, service provider edge equipment (Provider Edge, PE): PE1, PE2, PE3, CE1 is dual-homed to PE1 and PE2 , and public network tunnel 1 from PE1 to PE3 ( figure 1 The ...

AI Technical Summary

Problems solved by technology

Obviously, the link PE2-P3-PE3 is actually better than the link PE1-P1-P2-PE3, but CE1 cannot switch the path of the packet, so it cannot forward the packet along the optimal path from CE1 to CE2

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