Method and apparatus for announcing link state information and determining multicast forwarding path

Abstract

The invention relates to a method for notifying link status information and determining multicast forward path and a device method. The method comprises the following steps: carrying link status information of a forwarding adjacency-traffic engineering (FA TE) tunnel and a first link type identifier in a link status advertisement (LSA) message, and flooding broadcasting the LSA message; locally storing the received LSA message in a link status database, establishing an unicast routing table and a reverse path forwarding (RPF) routing table according to the information in the database, and initially searching a matching route in the RPF routing table when receiving a multicast message according to the address information carried in the multicast message; searching in the unicast routing table when the matching route is not found in the RPF routing table. The embodiment of the invention can flexibly avoid the TE tunnel interface in the event that a multi-protocol label switching-trafficengineering (MPLS TE) and a multicast protocol are allocated at the same time, and can adapt to the dynamic variation of the network topology and flexibly determine the multicast forwarding path.

Description

technical field [0001] The invention relates to the technical field of electronic communication, in particular to a method and device for announcing link state information and determining a multicast forwarding path. Background technique [0002] Currently commonly used PIM (Unicast Routing Protocol Independent Multicast Protocol) is a multicast routing protocol that has nothing to do with unicast routing protocols. PIM can use the existing unicast routing table to implement RPF (Reverse Path Forwarding) check without relying on a specific unicast routing protocol; it can also use the unicast routing table dedicated to multicast RPF check to perform RPF check. The specific process includes: the PIM router connected to the multicast receiver explicitly sends a PIM join message to the upstream PIM router along the shortest path to the multicast source; after the upstream PIM router receives the PIM join message, it continues along the path to the multicast source The shortest...

AI Technical Summary

Problems solved by technology

But this method is not flexible enough to adapt to the dynamic changes of the network topology

[0009] Therefore, there is currently no technical solution that can combine the link state information of the FA TE tunnel with the link state information of the existing P2P link when announcing the link state information of the FA TE tunnel when MPLS TE and the multicast protocol are deployed simultaneously. differentiated, and there is no technical solution that can not only avoid the TE tunnel interface, but also flexibly determine the multicast forwarding path

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