The present invention extends the PNNI protocols to support hierarchical multicast routing and signaling for ATM networks. The invention utilizes an extension to a core-based tree algorithm. Instead of a single core node, core nodes are maintained in each peer-group and at each level of the...http://www.google.com/patents/US5831975?utm_source=gb-gplus-sharePatent US5831975 - System and method for hierarchical multicast routing in ATM networks
