Command Reference Guide

66 ● igmp timer other-querier-present 3Com Router 5000 Family and Router 6000 Family
Command Reference
igmp timer other-querier-present
Purpose Use the igmp timer other-querier-present command to configure the
overtime value of presence of IGMP querier.
Use the undo igmp timer other-querier-present command to restore the
default value.
Syntax igmp timer other-querier-present seconds
undo igmp timer other-querier-present
Parameters seconds
IGMP querier present time, in seconds. Valid values are
1 to 131070 seconds.
If not specified, the default value is generally 120
seconds (or twice the value of the IGMP query
messages interval).
Example Configure the querier present time on the interface Ethernet1/0/0 to 200 seconds.
[3Com-Ethernet1/0/0] igmp timer other-querier-present 200
View This command can be used in the following views:
■ Interface view
Description On a shared network, i.e., there are multiple multicast routers on the same network
segment, the query router (querier for short) takes charge of sending query messages
periodically on the interface. If other non-queriers receive no query messages within
the valid period, the router will consider the previous query to be invalid and the
router itself becomes a querier.
In IGMP Version 1, the selection of a querier is determined by the multicast routing
protocol. In IGMP Version 2, the router with the lowest IP address on the shared
network segment acts as the querier.
CAUTION: If the querier present time configured is less than the twice of query
interval, it may lead to the repeated changes of queriers in the network.
Related Command ■ igmp timer query
■ display igmp interface