31.2.2 Extensions to other classes in ns

In the earlier chapter describing nodes in nsChapterchap:nodes, we described the internal structure of the node in ns. To briefly recap that description, the node entry for a multicast node is the switch
_. It looks at the highest bit to decide if the destination is a multicast or unicast packet. Multicast packets are forwarded to a multicast classifier which maintains a list of replicators; there is one replicator per source, group tuple. Replicators copy the incoming packet and forward to all outgoing interfaces.