CGMP on switches and routers for hosts to be able to subscribe to a multi-
cast group.
This is a very important task because without a rendezvous point, you will
not be able to send or receive multicast packets across a network. We will
also cover the individual interface configurations on routers. CGMP pro-
cesses will be discussed in a little more detail than in the preceding chapter.
device that will be configured. That fact makes it hard to present a set list of
configuration tasks that would apply to all scenarios. However, there are
definitely two items that must be configured on a router in order for multi-
cast to even begin working. These items include enabling multicast routing
and then enabling Protocol Independent Multicast (PIM) on the interfaces
that will carry multicast traffic.
required configuration, whereas the configuration described in the remain-
ing sections is optional. At the end of the configuration section, a summary
of possible configuration tasks will be listed.
straightforward, but without it, multicast will not work. Let's look at a con-
figuration of a router that does not have multicast enabled: