PIM SOURCE DISCOVERY BY LAST HOP ROUTER

摘要

Techniques are described for enhancements to Protocol Independent Multicast (PIM) to enable a last hop router (LHR) to perform source discovery and directly build or join a source tree. According to the techniques of this disclosure, the LHR builds a communication channel with a rendezvous point (RP) router and requests source information for at least one multicast group for which the LHR has interested receivers. The RP responds to the request by looking into a register database maintained by the RP and sending source information indicating at least one source that is actively providing traffic for the at least one multicast group. Based on the response, the LHR initiates a (S,G) PIM Join message toward the at least one source for the at least one multicast group to directly build or join at least one source tree.

主权项

1. A method comprising:
establishing, by a last hop router (LHR) in a network, a communication channel with a rendezvous point (RP) router in the network; sending, by the LHR to the RP router via the communication channel, a request for source information for at least one multicast group for which the LHR has interested receivers; receiving, by the LHR from the RP router via the communication channel, the source information indicating at least one source that is actively providing traffic for the at least one multicast group; initiating, by the LHR, establishment of at least one source tree toward the at least one source for the at least one multicast group; and upon establishment of the at least one source tree, receiving, by the LHR, the traffic for the at least one multicast group over the at least one source tree.