This feature allows you to filter register messages based on the policy file configured at the First Hop Router (FHR) and Rendezvous Point (RP) in PIM-SM domain. You can use the register policy to filter out specific PIM register messages that have encapsulated specific (S,G) packets. This feature allows you to detect and deny malicious multicast packets from flowing into a multicast shared tree, and causing a potential service blackout. The PIM Register Policy feature is supported in both the PIM IPV4 and PIM IPV6 mode .
If the cache‘s Group is in the SSM range, or is received in the PIM dense circuit, then this filtering is not applicable. The cache miss packet will go thru the normal processing.
The PIM filtering policy is configured at the FHR using the configure pim {ipv4 | ipv6} register-policy [policy | none] command.
The PIM filtering policy is configured at RP using the following command:
configure pim {ipv4 | ipv6} register-policy rp [rp_policy_name | none]