Users Guide

Preventing a Source from Registering with the RP
To prevent the PIM source DR from sending register packets to route processor (RP) for the specified
multicast source and group, use the following command. If the source DR never sends register packets to the
RP, no hosts can ever discover the source and create a shortest path tree (SPT) to it.
• Prevent a source from transmitting to a particular group.
CONFIGURATION mode
ip pim register-filter
In the following example, Source 1 and Source 2 are both transmitting packets for groups 239.0.0.1 and
239.0.0.2. R3 has a PIM register filter that only permits packets destined for group 239.0.0.2. An entry is
created for group 239.0.0.1 in the routing table, but no outgoing interfaces are listed. R2 has no filter, so it is
allowed to forward both groups. As a result, Receiver 1 receives only one transmission, while Receiver 2
receives duplicate transmissions.
Multicast Features 651