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<reference anchor='RFC2201'>

<front>
<title abbrev='Core Based Trees'>Core Based Trees (CBT) Multicast Routing Architecture</title>
<author initials='T.' surname='Ballardie' fullname='Tony Ballardie'>
<organization>Research Consultant</organization>
<address>
<email>ABallardie@acm.org</email></address></author>
<date month='September' year='1997' />
<area>Routing</area>
<keyword>multicast</keyword>
<keyword>routing</keyword>
<abstract>
<t>
   CBT is a multicast routing architecture that builds a single delivery
   tree per group which is shared by all of the group&apos;s senders and
   receivers.  Most multicast algorithms build one multicast tree per
   sender (subnetwork), the tree being rooted at the sender&apos;s
   subnetwork.  The primary advantage of the shared tree approach is
   that it typically offers more favourable scaling characteristics than
   all other multicast algorithms.
</t>
<t>
   The CBT protocol  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
   .
</t>
<t>
   CBT is progressing through the IDMR working group of the IETF.  The
   CBT protocol is described in an accompanying document . For this,
   and all IDMR-related documents, see http://www.cs.ucl.ac.uk/ietf/idmr
</t></abstract></front>

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