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Dell SmartFabric OS10 User Guide Release 10.5.3

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PIM register filters

The PIM register filter prevents the PIM source Designated Router (DR) from sending register packets to a Rendezvous Point (RP) for the specified multicast source and group. When the register packets are blocked, the RP cannot learn (S,G) and therefore cannot pull the traffic from the source and forward it to downstream routers and receivers. Thus, the unauthorized groups and sources are prevented from registering with an RP router.

You can apply register message filters on an FHR (DR) to control outgoing register messages or apply them on an RP to control incoming register messages. When the register filter is applied on the FHR or RP node, it does not affect the Shortest Path Tree (SPT) created using the IGMPv3 joins.

To configure register filter for IPv4 PIM, use the following command: 
ip pim [vrf <vrf-name>] register-filter <acl-name>
To view details of the configured PIM register filters, use the following command: 
show ip pim [vrf <vrf-name>] register-filter <group address> <source address>

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