WebSphere Message Broker supports three different types of multicast protocol:
PTL provides backward compatibility with WebSphere Business Integration Message Broker Version 5.0, where it is the only multicast protocol that is supported. For new multicast deployments, use one of the two PGM multicast protocols.
The broker supports two implementations of the PGM multicast protocol, PGM/IP and PGM UDP encapsulated. Which of the two PGM protocol types that you should choose, depends on the complexity of your network topology.
If your network topology consists of two or more subnets with many receiver clients in each subnet, use PGM/IP. PGM/IP takes advantage of PGM router assist support.
For a simpler network topology, use the PGM UDP encapsulated implementation, which does not use PGM router assist.
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