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IGMP snooping will consider that an mrouter is active if an mrouter port is
defined in the VLAN, regardless of whether the mrouter port is up or not. If
an mrouter port is defined, IGMP snooping will not flood multicast source
packets received in the VLAN. This behavior can be used to ensure that
IGMP snooping will selectively forward IPv4 multicast data traffic in a VLAN
even if no dynamically discovered IPv4 multicast router has been discovered.
Multicast data plane traffic from multicast sources in a VLAN is always
forwarded to the mrouter ports in the VLAN. Multicast control plane packets
(those addressed to the reserved 224.0.0.X address) are always flooded in the
VLAN, regardless of whether an mrouter port is defined or not.
Example
console(config)#ip igmp snooping vlan 10 mrouter interface Gi1/0/2
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Layer 2 Switching Commands
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