284 IGMP Snooping Commands
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.
Syntax
ip igmp snooping fast-leave
vlan-id
no ip igmp snooping fast-leave
•
vlan id
— Number assigned to the VLAN.
Default Configuration
IGMP snooping fast-leave mode is disabled on VLANs by default.
Command Mode
VLAN Configuration mode
User Guidelines
This command has no user guidelines.
Example
The following example enables IGMP snooping fast-leave mode on VLAN 2.
console(config-vlan)#ip igmp snooping fast-leave 2
ip igmp snooping groupmembership-interval
This command sets the IGMP Group Membership Interval time on a VLAN. The Group
Membership Interval time is the amount of time in seconds that a switch waits for a report from
a particular group on a particular interface before deleting the interface from the entry. This
value must be greater than the IGMPv3 Maximum Response time value. The range is 2 to 3600
seconds. The no form of this command sets the IGMPv3 Group Membership Interval time to
the default value.
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