When light multicast discovery is in effect, the IP Availability Manager in the Multicast Manager deployment not only performs its traditional discovery of network elements, but it also creates a multicast topology collection set from the discovered network elements.

IP Availability Manager queries every discovered router or switch in the managed environment for multicast support. At startup, the Multicast Manager imports the multicast collection set from the IP Availability Manager.

When light discovery is in effect, as described in “Configuring light discovery (optional)”, the Multicast Manager:
  • Imports the multicast topology collection sets from the source IP Availability Managers.
  • Begins listening for IP Availability Manager physical and data-link events relevant to the imported multicast topology.