IGMP snooping on Force10 IOA

Here is how IGMP snooping is implemented on the IOA.

IGMP snooping is enabled by default on the switch.

• FTOS supports version 1, version 2, and version 3 hosts.
• FTOS IGMP snooping is based on the IP multicast address (not on the Layer 2 multicast MAC address). IGMP snooping entries are stored in the Layer 3 flow table instead of in the Layer 2 forwarding information base (FIB).
• FTOS IGMP snooping is based on draft-ietf-magma-snoop-10.
• IGMP snooping is supported on all M I/O Aggregator stack members.
• A maximum of 8k groups and 4k virtual local area networks (VLAN) are supported.
• IGMP snooping is not supported on the default VLAN interface.
• Flooding of unregistered multicast traffic is enabled by default.
• Queries are not accepted from the server sideports and are only accepted from the uplink LAG.
• Reports and Leaves are flooded by default to the uplink LAG irrespective of whether it is an mrouter port or not

Of course if you disable a vlan that has been configured with IGMP snooping, any multicast traffic that hits this vlan will be ignored.