Systems and methods for implementing a bidirectional multicast protocol with two types of join messages are disclosed. The two types of join messages, upstream joins and downstream joins, are used to control the Reverse Path Forwarding (RPF) interface is added to the outgoing interface list for a particular...http://www.google.com/patents/US7808993?utm_source=gb-gplus-sharePatent US7808993 - Bidirectional multicast protocol with upstream and downstream join messages
