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The 8000 Series switch provides IP Multicast capability when used as a switch. As a switch, it supports Internet Group Management Protocols IGMPv1 and IGMPv2 to prune group membership per port within a VLAN by reporting multicast group memberships to neighbor multicast routers. This feature is called IGMP snooping.
The IGMP snooping feature allows you to optimize the multicast data flow for a group within a VLAN only to those that are members of the group. The switch listens to group reports from each port and builds a database of multicast group members per port. It suppresses the reports heard by not forwarding them out to other hosts, forcing the members to continuously send their own reports. The switch relays group membership from the hosts to the multicast routers. It forwards queries from multicast routers to all port members of the VLAN. Furthermore, it multicasts data only to the participating group members and to the multicast routers within the VLAN.
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