Command Line Interface Guide

494 IGMP Snooping Commands
ip igmp snooping (VLAN)
Use the ip igmp snooping command in VLAN Configuration mode to enable
IGMP snooping on a particular interface or on all interfaces participating in a
VLAN. To disable IGMP snooping use the no form of this command.
Syntax
ip igmp snooping vlan-id
no ip igmp snooping
Default Configuration
IGMP snooping is disabled on VLAN interfaces by default.
Command Mode
VLAN Configuration mode
User Guidelines
This command has no user guidelines.
Example
The following example enables IGMP snooping on VLAN 2.
console#vlan database
console(config-vlan)#ip igmp snooping 2
ip igmp snooping fast-leave
This command enables or disables IGMP Snooping fast-leave mode on a
selected VLAN. Enabling fast-leave allows the switch to immediately remove
the layer 2 LAN interface from its forwarding table entry upon receiving an
IGMP leave message for that multicast group without first sending out MAC-
based general queries to the interface. The no form of this command disables
IGMP Snooping fast-leave mode on a VLAN.
2CSPC4.X8100-SWUM100.book Page 494 Wednesday, August 29, 2012 6:23 PM