Administrator Guide

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.
IGMP Snooping Commands
Dell Networking OS supports IGMP Snooping version 2 and 3 on all Dell Networking systems.
Important Points to Remember for IGMP Snooping
● 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.
● Dell Networking OS supports IGMP snooping on JUMBO-enabled cards.
● IGMP snooping is not enabled by default on the switch.
● A maximum of 1800 groups and 600 VLAN are supported.
● IGMP snooping is not supported on a default VLAN interface.
● IGMP snooping is not supported over VLAN-Stack-enabled VLAN interfaces (you must disable IGMP snooping on a VLAN
interface before configuring VLAN-Stack-related commands).
clear ip igmp groups
Clear entries from the group cache table.
Syntax
clear ip igmp groups [group-address | interface]
Parameters
group-address (OPTIONAL) Enter the IP multicast group address in dotted decimal format.
interface (OPTIONAL) Enter the interface type and slot/port information: For a VLAN
interface enter the keyword vlan followed by a number from 1 to 4094.
Command Modes EXEC Privilege
Supported Modes All Modes
Command
History
Version Description
9.4(0.0) Supported on the FN I/O Aggregator.
8.3.17.0 Supported on the M I/O Aggregator.
Internet Group Management Protocol (IGMP) 153