Abstract
CBT is a network-layer multicast routing protocol [BFC93] which uses a single bidirectional shared tree for a group. This is in contrast to several other protocols, such as Distance Vector Multicast Routing Protocol (DVMRP) and Protocol Independent Multicast (PIM)1, which rely on either source-based shortest path trees or a combination of shortest path tree and unidirectional shared tree. Theoretically DVMRP and PIM may create as many delivery trees as the number of senders. However, there is a single delivery tree in CBT regardless of the number of senders.
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