Command Line Reference Guide

Internet Group Management Protocol

(IGMP)

The Dell Networking OS supports IGMP snooping version 2 and 3 on all Dell Networking systems.

IGMP Commands

The Dell Networking OS supports the following IGMP commands:

• 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

• Dell Networking OS supports version 1, version 2, and version 3 hosts.

• Dell Networking OS 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).

• Dell Networking OS 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.

clear ip igmp groups

Clear entries from the group cache table.

Syntax

clear ip igmp groups [group-address | interface]

Internet Group Management Protocol (IGMP)

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