IPv4 PIM Register Message Filter Rule

Protocol Independent Multicast (PIM) register messages received from a downstream multicast designated router (DR) should be filtered for reserved or any other undesirable multicast groups.

The IPv4 PIM register message filter rule interacts with configured extended IP access control lists (ACLs) at software level to either permit or deny register messages for matching (S, G) IP address rules in the RP. When a deny ACL action matches, the RP sends a register stop message to the DR to further limit new register messages.

Networks that do not maintain a multicast domain and require only the IP multicast service are required to stand up a PIM-SM router that will be incorporated into the JIE shared tree structure by establishing a peering session with an RP router. This helps to provide a secured IP core network. All RP devices that are peering with customer PIM-SM routers implement a PIM import policy that blocks multicast registration requests for reserved or any other undesirable multicast groups.

Note: In an RP, where both the PIM register message filter rule and the PIM register message rate limit are configured, filtering functionality takes precedence over rate limiting.
Note: Register message filtering depends on the availability of ACL resources in the network.

In this section:

  1. Configuring the Register Message Filter Rule for PIM
    Complete the following steps to configure the register message filter rule for PIM so that unauthorized multicast sources or groups are blocked.
Parent topic: IPv4 Multicast Protocols