Installation manual

4-316
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Command Usage
• The IGMP snooping leave-proxy feature suppresses all unnecessary IGMP leave
messages so that the non-querier switch forwards an IGMP leave packet only when
the last dynamic member port leaves a multicast group.
• The leave-proxy feature does not function when a switch is set as the querier.
Example
ip igmp snooping immediate-leave
This command immediately deletes a member port of a multicast service if a leave packet
is received at that port and immediate-leave is enabled for the parent VLAN. Use the no
form to restore the default.
Syntax
[no] ip igmp snooping immediate-leave vlan-id
vlan-id - VLAN ID (1 to 4094)
Default Setting
Disabled
Command Mode
Interface Configuration (VLAN)
Command Usage
• If immediate-leave is not used, a multicast router (or querier) will send a
group-specific query message when an IGMPv2 or IGMPv3 group leave message
is received. The router/querier stops forwarding traffic for that group only if no host
replies to the query within the specified timeout period. Note that the timeout period
is determined by ip igmp snooping query-max-response-time (see 4-320).
• If immediate-leave is enabled, the switch assumes that only one host is connected
to the interface. Therefore, immediate leave should only be enabled on an interface
if it is connected to only one IGMP-enabled device, either a service host or a
neighbor running IGMP snooping.
• This command is only effective if IGMP snooping is enabled, and IGMPv2 or
IGMPv3 snooping is used.
Example
The following shows how to enable immediate leave.
Console(config)#ip igmp snooping leave-proxy
Console(config)#
Console(config)#interface vlan 1
Console(config-if)#ip igmp snooping immediate-leave
Console(config-if)#