IPv6 PIM Anycast RP

IPv6 PIM Anycast RP is a method of providing load balancing and fast convergence to IPv6 PIM RPs in an IPv6 multicast domain. The RP address of the Anycast RP is a shared address used among multiple IPv6 PIM routers, known as IPv6 PIM RP. The IPv6 PIM RP routers create an Anycast RP set. Each router in the Anycast RP set is configured using two IPv6 addresses: a shared RP address in their loopback address and a separate, unique IPv6 address. The loopback address must be reachable by all IPv6 PIM routers in the multicast domain. The separate, unique IPv6 address is configured to establish static peering with other IPv6 PIM routers and communication with the peers.

When the source is activated in an IPv6 PIM Anycast RP domain, the IPv6 PIM First Hop (FH) will register the source to the closest IPv6 PIM RP. The IPv6 PIM RP follows the same MSDP Anycast RP operation by decapsulating the packet and creating the (s,g) state. If there are external peers in the Anycast RP set, the router will re-encapsulate the packet with the local peering address as the source address of the encapsulation. The router will unicast the packet to all Anycast RP peers. The re-encapsulation of the data register packet to Anycast RP peers ensures source state distribution to all RPs in a multicast domain.