DELL PC6224F User Manual

Page of 1356
IGMP Snooping Commands
341
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(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.
You should enable fast-leave admin mode only on VLANs where only one host 
is connected to each layer 2 LAN port. This setting prevents the inadvertent 
dropping of the other hosts that were connected to the same layer 2 LAN port 
but were still interested in receiving multicast traffic directed to that group. 
Also, fast-leave processing is supported only with IGMP version 2 hosts.