You can configure a BIG-IP® system non-default route domain to use the
Protocol Independent Multicast (PIM) protocol dense mode (DM), which is available with a Multicast Routing Bundle license in addition to licensed ZebOS® dynamic routing. This configuration provides an effective multicast
solution for Local Area Networks (LANs) that are configured with listeners at most locations.
For example, in a PIM-DM configuration, you can configure the Local Traffic Manager (LTM) to use a wildcard forwarding virtual server to flood IPv4 or IPv6 multicast
traffic throughout the domain. Interested listeners, located downstream from a PIM router, use
the Internet Group Management Protocol (IGMPv3) protocol for IPv4 traffic or Multicast Listener
Discovery (MLDv2) protocol for IPv6 traffic to join the multicast group. When the LTM receives traffic, it sends that traffic to all active PIM routers, which
then forward the packets toward the interested listeners. PIM routers without interested
listeners prune themselves from the multicast group. When a listener leaves the multicast group,
the upstream router sends a PIM prune message to the LTM, which removes that router from the
group's forwarding list, thus enabling the LTM to send group traffic only to active PIM routers,
and use the shortest-path trees.
Additionally, a PIM-DM configuration applies reverse path forwarding functionality, using the
unicast routing information base (RIB), to provide loop-free forwarding of multicast traffic.