Title: Core Based Trees (CBT) Multicast Routing Architecture
Author(s): A. Ballardie.
Status: EXPERIMENTAL
Date: Sep 1997
Length: 38040
CBT is a multicast routing architecture that builds a single delivery tree per group which is shared by all of the group's senders and receivers. Most multicast algorithms build one multicast tree per sender (subnetwork), the tree being rooted at the sender's subnetwork. The primary advantage of the shared tree approach is that it typically offers more favourable scaling characteristics than all other multicast algorithms.
The CBT protocol [1] is a network layer multicast routing protocol that builds and maintains a shared delivery tree for a multicast group. The sending and receiving of multicast data by hosts on a subnetwork conforms to the traditional IP multicast service model
[2].
CBT is progressing through the IDMR working group of the IETF. The CBT protocol is described in an accompanying document [1]. For this, and all IDMR-related documents, see http://www.cs.ucl.ac.uk/ietf/idmr
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