METHOD AND SYSTEM FOR LAYERED DISTRIBUTION OF IP MULTICAST DATA

摘要

The present invention is applied to the technical field of IP network communications. Provided are a method and system for layered distribution of IP multicast data. The method comprises: coding a raw multicast data flow into a plurality of subflows first, then designating a shunt sub-information source for each of the subflows, allocating subgroup addresses and establishing subgroup states and so on to form a shunt structure, and then an information sink sending a Join message to each of the shunt sub-information sources and joining each of the shunt sub-information sources to become the leaf nodes of each subtree, each node determining a middle node of each subtree according to the port which receives the Join message to form a multicast distribution tree, and if congestion occurs in the overlaps among the multicast distribution trees, using network coding to eliminate the congestion at the congestion node, and constructing a coding subtree below a coding node according to a method for constructing a shunt subtree. The present invention can provide higher bandwidth and better stability than traditional multicast tree structures and can provide differentiated services for heterogeneous information sinks.