PLANET SGSD-1022 - Manual (Page 649)

User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
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 4-305).
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, eiter 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)#interface vlan 1
Console(config-if)#ip igmp snooping immediate-leave
Console(config-if)#
show ip igmp snooping
This command shows the IGMP snooping configuration.
Default Setting
None
Command Mode
Privileged Exec
Command Usage
See “Configuring IGMP Snooping and Query Parameters” on page 3-239 for a description of the displayed items.
Example
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