ip igmp snooping last-member-query-count
To configure how often Internet Group Management Protocol (IGMP) snooping will send query messages in
response to receiving an IGMP leave message, use the ip igmp snooping last-member-query-count
command in global configuration mode. To set count to the default value, use the no form of the command.
ip igmp snooping [vlan vlan-id] last-member-query-count count
no ip igmp snooping [vlan vlan-id] last-member-query-count count
Syntax Description
(Optional) Sets the count value on a specific VLAN ID. The range is from 1 to
1001. Do not enter leading zeroes.
vlan vlan-id
The interval at which query messages are sent, in milliseconds. The range is from
1 to 7. The default is 2.
count
Command Default
A query is sent every 2 milliseconds.
Command Modes
Global configuration
Command History
ModificationRelease
This command was introduced.Cisco IOS XE 3.3SE
Usage Guidelines
When a multicast host leaves a group, the host sends an IGMP leave message. To check if this host is the last
to leave the group, IGMP query messages are sent when the leave message is seen until the
last-member-query-interval timeout period expires. If no response to the last-member queries are received
before the timeout period expires, the group record is deleted.
Use the ip igmp snooping last-member-query-interval command to configure the timeout period.
When both IGMP snooping immediate-leave processing and the query count are configured, immediate-leave
processing takes precedence.
Do not set the count to 1 because the loss of a single packet (the query packet from the device to the host
or the report packet from the host to the device) may result in traffic forwarding being stopped even if
there is still a receiver. Traffic continues to be forwarded after the next general query is sent by the device,
but the interval during which a receiver may not receive the query could be as long as 1 minute (with the
default query interval).
Note
The leave latency in Cisco IOS software may increase by up to one last-member-query-interval (LMQI) value
when the device is processing more than one leave within an LMQI. In this case, the average leave latency is
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
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ip igmp snooping last-member-query-count
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