Cisco Cisco 5760 Wireless LAN Controller Technical References
The leave latency in Cisco IOS software may increase by up to one last-member-query-interval (LMQI) value
when the controller is processing more than one leave within a LMQI. In this case, the average leave latency
is determined by the (count + 0.5) * LMQI. The result is that the default leave latency can range from 2.0 to
3.0 seconds with an average of 2.5 seconds under a higher load of IGMP leave processing. The leave latency
under load for the minimum LMQI value of 100 milliseconds and a count of 1 is from 100 to 200 milliseconds,
with an average of 150 milliseconds. This is done to limit the impact of higher rates of IGMP leave messages.
when the controller is processing more than one leave within a LMQI. In this case, the average leave latency
is determined by the (count + 0.5) * LMQI. The result is that the default leave latency can range from 2.0 to
3.0 seconds with an average of 2.5 seconds under a higher load of IGMP leave processing. The leave latency
under load for the minimum LMQI value of 100 milliseconds and a count of 1 is from 100 to 200 milliseconds,
with an average of 150 milliseconds. This is done to limit the impact of higher rates of IGMP leave messages.
Examples
The following example sets the last member query count to 5:
Controller(config)#
ip igmp snooping last-member-query-count 5
Consolidated Platform Command Reference, Cisco IOS XE Release 3SE (Cisco WLC 5700 Series)
312
OL-29471-01
ip igmp snooping last-member-query-count