Administrator Guide

Preventing a Source from Registering with the RP
To prevent the PIM source DR from sending register packets to 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.
Figure 98. Preventing a Source from Transmitting to a Group
Table 62. Preventing a Source from Transmitting to a Group — Description
Location Description
1/21
• Interface GigabitEthernet 1/21
• ip pim sparse-mode
• ip address 10.11.12.1/24
Multicast Features 579