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Configuring IGMP 179
Perform the following configuration in VLAN-interface view.
By default, no filters are configured. All multicast groups are allowed on the
interface.
Configuring the IGMP Query Message Interval
Multicast routers send IGMP query messages to find present multicast groups on
other networks. Multicast routers send query messages periodically to refresh their
information of members present.
Perform the following configuration in VLAN interface view.
When there are multiple multicast routers on a network segment, the querier is
responsible for sending IGMP query messages to all hosts on the LAN.
The default interval is 60 seconds.
Configuring the IGMP Querier Present Timer
The IGMP querier present timer defines the period of time before the router takes
over as the querier.
Perform the following configuration in VLAN interface view.
By default, the value is 120 seconds. If the router has received no query message
within twice the interval specified by the igmp timer query command, it will
regard the previous querier invalid.
Configuring the Maximum Query Response Time
When a router receives a query message, the host will set a timer for each
multicast group it belongs to. The value of the timer is randomly selected between
0 and the maximum response time. When any timer becomes 0, the host will send
the membership report message of the multicast group.
Table 14 Limit the Access to IP Multicast Groups
Operation Command
Limit the range of allowed multicast groups
on current interface
igmp group-policy acl-number [ 1 | 2 ]
Remove the filter set on the interface undo igmp group-policy
Table 15 Configure the IGMP Query Message Interval
Operation Command
Configure the IGMP query message interval igmp timer query seconds
Restore the IGMP query message interval to
the default value
undo igmp timer query
Table 16 Configure the IGMP Querier Present Timer
Operation Command
Change the IGMP querier present timer igmp timer other-querier-present seconds
Restore the IGMP querier present timer to the
default value
undo igmp timer other-querier-present