3Com 3C13612, Command Reference Manual

Page: 632 / 859

3Com Router Command Reference Guide — V1.00
Parameter
seconds : Maximum response time contained in IGMP query packet, ranging from
1 to 25 seconds. The default value is 10.
Description
Using the igmp max-response-time command, you can configure the maximum
response time contained in IGMP query packet. Using the undo igmp
max-response-time command you can restore the default value of the maximum
response time contained in IGMP query packet.
If the time configured is less than 10 seconds, the router can quickly know the
existing status of members in the group. But, it shall be noted that this command
can be used only when the router interface runs IGMP Version 2.
For related commands, see pim timer hello, display igmp group.
Example
# Configure the maximum response time contained in IGMP query packet as 9
seconds.
[3Com-Ethernet0] igmp max-response-time 9
1.1.7 igmp timer querier-present
Syntax
igmp timer querier-present seconds
undo igmp timer querier-present
View
Interface view
Parameter
seconds : Timeout time of the subnet Querier. The value shall be two times of the
query interval at which IGMP query packet is sent, ranging from 60 to 300
seconds. The default value is 250.
Description
Using the igmp timer querier-present command, you can configure the timeout
time of the subnet Querier. Using the undo igmp timer querier-present
command, you can restore the default value of the subnet Querier timeout time.
When there are multiple routers on a subnet running IGMP, it is necessary to
select a router to act as the Querier, which will be responsible for sending query
packet to other routers on the network segment. When initiating network, all
routers in the network segment consider themselves as Querier by default and
send ordinary query packet to all multicast hosts of the subnet connected. And
6