System information

Configuring IP Multicast Routing
8-19
Use the ip igmp query-interval command in Interface Configuration mode to change
the IGMP host-query message interval, as shown below:
MOT(config-if)#ip igmp query-interval <n>
where:
n is the time interval from 1 to 3600 seconds that the BSR sends IGMP
host-query messages to connected networks.
Specifying the IGMP Querier Time-out Interval
IGMP Version 2 allows a time interval to be specified for a querier to surrender its
function as the querier for the interface over to the BSR. The BSR then becomes the
querier for the interface.
Use the ip igmp querier-timeout command in Interface Configuration mode to
specify the IGMP querier timeout interval, as shown below:
MOT(config-if)#ip igmp querier-timeout <n>
where:
n is the time interval from 60 to 3600 seconds.
Changing the Maximum Query Response Time
IGMP Version 2 allows the maximum query response time advertised in IGMP
queries to be changed. The maximum query response time allows a router to quickly
detect that there are no more directly connected group members on a subnetwork.
Decreasing the value allows the BSR to prune groups quickly.
The query response interval is the maximum amount of time that can elapse between
when the querier router sends a host-query message and when it receives a response
from a host.
Note: The time interval should be twice the number of seconds as the IGMP
query interval.