Users Guide

Table Of Contents
IGMP immediate leave
If the IGMP querier does not receive a response to a group-specific or group-and-source query, it sends another query based
on the configured 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-specific or group-and-source queries before deleting the
entry.
To configure 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 different IGMP version:
OS10# configure terminal
OS10# interface vlan12
OS10(conf-if-vl-12)# ip igmp version 3
IGMP commands
clear ip igmp groups
Clears entries from the group cache table.
Syntax
clear ip igmp [vrf vrf-name] groups
Parameters vrf vrf-nameEnter the keyword vrf, then the name of the VRF.
Default None
Command Mode EXEC
Usage
Information
None
Example
OS10# clear ip igmp groups
Supported
Releases
10.4.3.0 or later
ip igmp immediate-leave
Enables IGMP immediate leave.
Syntax
ip igmp immediate-leave
Parameters None
Default None
Command Mode INTERFACE
Usage
Information
The querier sends some group-specific queries when it receives a leave message before deleting the
group from the membership database. If you need to immediately delete a group from the membership
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