Configuring the Switch
3-206
Enabling IGMP Immediate Leave
The switch can be configured to immediately delete a member port of a multicast
service if a leave packet is received at that port and the immediate-leave function is
enabled for the parent VLAN. This allows the switch to remove a port from the
multicast forwarding table without first having to send an IGMP group-specific query
to that interface.
Immediate leave can improve bandwidth usage for a network which frequently
experiences many IGMP host add and leave requests. (Just note that immediate
leave does not apply to a port if the switch has learned that a multicast router is
attached to it.)
Command Attributes
• VLAN ID — ID of configured VLAN (1-4094)
• Immediate Leave – Sets the status for immediate leave on the specified VLAN.
(Default: Disabled)
Web – Click IGMP Snooping, IGMP Immediate Leave. Select the VLAN interface to
configure, set the status for immediate leave, and click Apply.
Figure 3-102 IGMP Immediate Leave
CLI – This example enables IGMP immediate leave for VLAN 1 and then displays
the current IGMP snooping status.
Console(config)#interface vlan 1
Console(config-if)#ip igmp snooping immediate-leave 4-254
Console(config-if)#end
Console#show ip igmp snooping 4-255
Service Status: Enabled
Querier Status: Disabled
Leave proxy status: Disabled
Query Count: 2
Query Interval: 125 sec
Query Max Response Time: 10 sec
Router Port Expire Time: 300 sec
Immediate Leave Processing: Enabled on VLAN 1,
IGMP Snooping Version: Version 2
Console#
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