Loop avoidance technique for the multicast control plane

摘要

The present disclosure provides for a loop avoidance technique that implements an upstream neighbor check to detect any forwarding inconsistencies. When a message is received from a neighbor routing element, an upstream neighbor check is performed to determine whether the neighbor routing element is an upstream neighbor toward a content provider of a datastream identified in the message. If the check determines that the neighbor routing element is not an upstream neighbor, then a forwarding inconsistency is not detected. If the check determines that the neighbor routing element is an upstream neighbor, then a forwarding inconsistency is detected.

主权项

1. A method, comprising:
receiving a message from a neighbor routing element at a routing element, wherein
the message identifies a datastream, andthe datastream is provided by a content provider; performing an upstream neighbor check, in response to receiving the message, wherein
the upstream neighbor check determines whether the neighbor routing element is one of a plurality of upstream neighbors toward the content provider; if the neighbor routing element is one of the plurality of upstream neighbors, determining that a forwarding inconsistency is detected, and holding the message in response to the determining that a forwarding inconsistency is detected; and if the neighbor routing element is not one of the plurality of upstream neighbors, determining that no forwarding inconsistency is detected, and forwarding the message in response to the determining that no forwarding inconsistency is detected.