
Customizing Protocol Independent Multicast
117355-D Rev 00
6-3
This section covers the following topics:
Components of a PIM Network
A PIM network consists of the devices described in this section.
Hosts
A host can be either a source or a receiver. A source sends multicast data to a
multicast group. A source is not required to be a receiver of the group. A source is
also known as a sender.
A receiver wants to receive multicast data from all sources of the multicast group.
Last-Hop Router
The last-hop router is usually the designated router for the receiver side of the
network. It is the last router on the path from the source to the receiver.
Designated Router
The designated router (DR) is responsible for sending register messages to the RP
on behalf of directly connected sources. It is also responsible for sending
join/prune messages to the RP on behalf of directly connected receivers. The DR
maintains information about the status of the active RP for local sources in each
multicast group.
Topic Page
Components of a PIM Network
6-3
Join/Prune, Register, and Assert Messages 6-7
Shared Trees and Shortest-Path Trees 6-8
How a Receiver Joins a Multicast Group 6-10
How a Receiver Leaves a Multicast Group 6-12
How a Source Sends Multicast Packets to a Group 6-12
How the RP Switches to the Shortest-Path Tree 6-15
How the Last-Hop Router Switches to the Shortest-Path Tree 6-17
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