Link protection method and equipment

Abstract

The invention discloses a link protection method and ink protection equipment for solving the problem that the multicast stream cannot be normally forwarded all the time before reconstruction of a forwarding tree is completed in the prior art. In the method, a main link and a corresponding protection link are configured between first routing equipment and second routing equipment on the downstream of the first routing equipment; when the main link fails, the first routing equipment changes a main output interface of the main link in a multicast forwarding table entry output interface list corresponding to the main link into an associated protection output interface, and forwards the multicast stream according to the updated multicast forwarding table entry; the second routing equipment modifies unicast reverse path forwarding (uRPF) interfaces of all multicast stream on a main input interface of the main link into associated protection input interfaces; and the reconstruction of a path tree succeeds, the first routing equipment forwards the multicast stream according to the multicast forwarding table entry updated in the path tree reconstruction process after receiving the multicast stream, and cancels the protection output interface in the multicast forwarding table entry according to the pruning process initiated by the second routing equipment.

Description

A link protection method and device thereof technical field The invention relates to IP multicast technology in the field of communication technology, in particular to a link protection method and equipment thereof. Background technique In the multicast model, the destination address field of the IP packet is the multicast group address, and the multicast source transmits information to the host group identified by the destination address. Therefore, in order to transmit the multicast packet to receiving sites in various directions, the multicast router on the forwarding path often needs to forward the multicast packet received from one incoming interface to multiple outgoing interfaces. In order to ensure the transmission of multicast packets in the network, it is necessary to rely on a unicast routing table or a routing table provided separately for multicast (such as an MBGP routing table, where MBGP stands for Multi-Protocol Border Gateway Protocol) to guide forwardin...

AI Technical Summary

Problems solved by technology

The present invention provides a link protection method and its equipment to solve the problem in the prior art that multicast streams cannot be forwarded normally before the reconstruction of the forwarding tree is completed

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