Which multicast component is irrelevant when defining a multicast replicator outside the local network without any multicast sources or receivers?

Overlay BFD (Bidirectional Forwarding Detection) is crucial for monitoring the liveness of tunnel interfaces (TLOCs) in the overlay, which is essential for any traffic, including multicast, to ensure reachability to the replicator.

PIM (Protocol Independent Multicast) interfaces are used to enable PIM routing on a local interface for forwarding multicast traffic within a local network segment. If there are no local multicast sources or receivers and the replicator is solely for overlay replication across the SD-WAN fabric, local PIM interfaces are not directly required for the replicator functionality itself.

OMP (Overlay Management Protocol) is the routing protocol of Cisco SD-WAN and is used to advertise and learn the TLOCs and service routes, including information necessary for multicast routing and replicator discovery across the overlay.

TLOC (Transport Location) represents the tunnel endpoints on WAN Edge routers, and a multicast replicator needs to be reachable via a TLOC in the overlay network to receive and forward multicast traffic.