Preventing a PIM Router from Forming an Adjacency
To prevent a router from participating in PIM (for example, to congure stub multicast routing), use the following command.
• Prevent a router from participating in PIM.
INTERFACE mode
ip pim neighbor-filter
Preventing a Source from Registering with the RP
To prevent the PIM source DR from sending register packets to route processor (RP) for the specied 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
lter 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 lter, so it is allowed to forward both groups. As a result, Receiver 1 receives only one transmission, while
Receiver 2 receives duplicate transmissions.
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Multicast Features
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