C
HAPTER
38
| Multicast Filtering Commands
IGMP Snooping
– 1202 –
ip igmp
snooping vlan
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 vlan vlan-list immediate-leave
vlan-list - Separate nonconsecutive VLAN identifiers with a comma
and no spaces; use a hyphen to designate a range of IDs.
(Range: 1-4094).
DEFAULT SETTING
Disabled
COMMAND MODE
Global Configuration
COMMAND USAGE
â—† If immediate-leave is not used, a multicast router (or querier) will send
a group-specific query message when an IGMPv2/v3 group leave
message is received. The router/querier stops forwarding traffic for that
group only if no host replies to the query within the time out period.
(The time out for this release is currently defined by Last Member
Query Interval (fixed at one second) * Robustness Variable (fixed at 2)
as defined in RFC 2236.
â—† 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.
â—† 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 vlan 1 immediate-leave
Console(config)#
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