Use this procedure to enable IP Multicast over Fabric Connect on each of the VLANs within the GRT that need to support IP multicast traffic. The default is disabled.
Note
You do not have to enable IP Shortcuts to support IP multicast routing in the GRT using SPBM.
You cannot enable IP PIM when IP Multicast over Fabric Connect is enabled on the VLAN.
You must configure the required SPBM and IS-IS infrastructure, which includes the creation of SPBM B-VLANs.
You must create the C-VLANs and add slots/ports.
You must enable IP Multicast over Fabric Connect globally.
If there is no IP interface on the VLAN, then you create one. (The IP interface must be in the same subnet as the IGMP hosts that connect to the VLAN).
With IP Multicast over Fabric Connect within the GRT, routing of IP multicast traffic is allowed within the subset of VLANs in the GRT that have IP Multicast over Fabric Connect enabled. When you enable IP Multicast over Fabric Connect on a VLAN, the VLAN automatically becomes a multicast routing interface.
You must enable IP Multicast over Fabric Connect on each of the VLANs within the GRT that need to support IP multicast traffic. After you enable IP Multicast over Fabric Connect on the VLANs, any IGMP functions required for IP Multicast over Fabric Connect within the GRT are automatically enabled. You do not need to configure anything IGMP related.
If you only want to use IP Multicast over Fabric Connect, you do not need to enable the Layer 3 VSN or redistribute unicast routes into or out of IS-IS. IP Multicast over Fabric Connect routing within the GRT does not depend on unicast routing. This allows for you to more easily migrate from a PIM environment to IP Multicast over Fabric Connect. You can migrate a PIM environment to IP Multicast over Fabric Connect first and then migrate unicast separately or not at all.
The switch only supports IPv4 addresses with IP Multicast over Fabric Connect.
Note
After you enable IP Multicast over Fabric Connect, you cannot enable IGMP, IGMP Snooping, or IGMP proxy on the interface. If you try to enable IGMP Snooping or proxy on any interface where SPBM multicast is enabled, an error message appears.
Note
When you enable IP Multicast over Fabric Connect on a Controller switch in a DvR domain, the configuration is automatically pushed to the Leaf nodes within the domain.