3Com SuperStack 4 Configuration Manual page 171

5 If the IGMP querier does not receive a report message from any other host within
this period, then it takes it as timeout and ends membership maintenance for this
group.
This command can be used only when the querier runs IGMP version 2, since a
host running IGMP Version 1 does not send an IGMP Leave Group message when
it leaves a group.
Perform the following configuration in Interface View.
Configure interval for querying IGMP packets, see
■
interval is 1 second.
Configuring the number of last member querying, see
■
an IGMP group-specific query message is sent for twice
Table 192 Configuring interval for querying IGMP packets
Operation
Configure interval for querying IGMP
packets
Restore the default query interval
Table 193 Configure the number of last member querying
Operation
Configure number of last member querying
Restore the default number of querying
Configuring the Present Time of IGMP Querier
The IGMP querier present timer defines the period of time before the router takes
over as the querier sending query messages, after the previous querier has
stopped doing so.
Perform the following configuration in Interface view.
Table 194 Configuring the present time of IGMP querier
Operation
Change the present time of IGMP
querier
Restore the default value
By default, the value is 120 seconds. If the router has received no query message
within twice the interval specified by the
regard the previous querier invalid.
Configuring Maximum Response Time for IGMP Query Message
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.
Internet Group Management Protocol (IGMP)
Table
Command
igmp lastmember-queryinterval
undo igmp lastmember-queryinterval
Command
igmp robust-count
undo igmp robust-count
Command
igmp timer other-querier-present
undo igmp timer other-querier-present
igmp timer query
183
192. By default, the
Table 193. By default,
seconds
robust-value
seconds
command, it will