Concept Guide

last-member-query-count 2
version-1-router-present-timeout 400
version-2-router-present-timeout 400
max-members-per-group 300
quick-client-convergence enabled
ssm-range IANA standard range. 232.0.0.0/8
The output of this command includes the following parameters:
Parameter Description
robustness-variable
This variable is increased from its default level of 2 to allow for
expected packet loss on a subnetwork.
query-interval
Interval, in seconds, at which the controller sends host-query
messages to the multicast group address 224.0.0.1 to solicit
group membership information.
query-response-interval
Maximum time, in .1 second intervals, that can elapse between
when the controller sends a host-query message and when it
receives a response. This must be less than the query-
interval.
startup-query-count
Number of queries that the controller sends out on startup,
separated by startup-query-interval. The default setting is the
value of the robustness-variable parameter.
startup-query-interval
Interval, in seconds, at which the controller sends general
queries on startup. The default value of this parameter is 1/4 of
the query-interval.
last-member-query-count
Number of group-specific queries that the controller sends
before assuming that there are no local group members.
last-member-query-interval
Maximum time, in seconds, that can elapse between group-
specific query messages.
version-1-router-present-timeout
Timeout, in seconds, if the controller detects a version 1 IGM
router.
version-2-router-present-timeout
Timeout, in seconds, if the controller detects a version 2 IGM
router.
The following examples displays the information on IGMP groups :
(host) #show ip igmp group
IGMP Group Table
----------------
(Source,Group) Members
-------------- -------
(172.12.2.2, 232.0.0.2) 2
(172.12.2.2, 232.0.0.1) 2
(*, 224.0.0.252) 2
(*, 239.255.255.250) 2
Total Groups: 4
(host) #show ip igmp group maddr 232.0.0.1 source 172.12.2.2
IGMP Group (172.12.2.2, 232.0.0.1) Table
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