Reference Guide

Internet Group Management Protocol (IGMP) | 121

Internet Group Management Protocol (IGMP)

IGMP Commands

The Dell Force10 operating software (FTOS) supports internet group management protocol (IGMP)

snooping version 2 and 3 on all Dell Force10 systems:

• clear ip igmp groups

• debug ip igmp

• ip igmp snooping flood

• show ip igmp groups

• show ip igmp interface

• show ip igmp snooping mrouter

Important Points to Remember

• FTOS supports version 1, version 2, and version 3 hosts.

• FTOS IGMP snooping implementation is based on IP multicast address (not based on Layer 2

multicast mac-address) and the IGMP snooping entries are in Layer 3 flow table not in Layer 2

forwarding information base (FIB).

• FTOS IGMP snooping implementation is based on draft-ietf-magma-snoop-10.

• IGMP snooping is supported on all M I/O Aggregator stack members.

• IGMP snooping is enabled by default on the switch.

• A maximum of 8k groups and 4k virtual local area networks (VLAN) are supported.

• IGMP snooping is not supported on default VLAN interface.

• Flooding of unregistered multicast traffic is enabled by default.

• Queries are not accepted from the server side ports 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.