Connectivity Guide

The querier advertises the maximum response time in the query. Lowering this value decreases leave latency but increases response
burstiness because all host membership reports are sent before the maximum response time expires. Inversely, increasing this value
decreases burstiness, but increases leave latency.
To congure maximum response time:
OS10# configure terminal
OS10# interface vlan120
OS10(conf-if-vl-120)# ip igmp query-max-resp-time 20
IGMP immediate leave
If the IGMP querier does not receive a response to a group-specic or group-and-source query, it sends another query based on the
congured querier robustness value. This value determines the number of times the querier sends the message. If the querier does not
receive a response, it removes the group from the outgoing interface for the subnet.
IGMP immediate leave reduces leave latency by enabling a router to immediately delete the group membership on an interface after
receiving a leave message. Immediate leave does not send group-specic or group-and-source queries before deleting the entry.
To congure IGMP immediate leave:
OS10# configure terminal
OS10# interface vlan14
OS10(conf-if-vl-14)# ip igmp immediate-leave
Select an IGMP version
OS10 enables IGMP version 3 by default.
If hosts require an IGMP version other than 3, use the following to select a dierent IGMP version:
OS10# configure terminal
OS10# interface vlan12
OS10(conf-if-vl-12)# ip igmp version 3
View IGMP-enabled interfaces and groups
To view IGMP-enabled interfaces and groups, use the following show commands.
To view IGMP-enabled interfaces:
OS10# show ip igmp interface
Vlan103 is up, line protocol is up
Internet address is 2.1.1.2
IGMP is enabled on interface
IGMP version is 3
IGMP query interval is 60 seconds
IGMP querier timeout is 130 seconds
IGMP last member query response interval is 1000 ms
IGMP max response time is 10 seconds
IGMP immediate-leave is disabled on this interface
IGMP joins count: 0
IGMP querying router is 2.1.1.1
Vlan105 is up, line protocol is up
Internet address is 3.1.1.2
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