Internet Group Management Protocol (IGMP) 183
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 Ta ble 192. By default, the
interval is 1 second.
■ Configuring the number of last member querying, see Ta b le 193. By default,
an IGMP group-specific query message is sent for twice
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.
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 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.
Tab le 192 Configuring interval for querying IGMP packets
Operation Command
Configure interval for querying IGMP
packets
igmp lastmember-queryinterval
seconds
Restore the default query interval undo igmp lastmember-queryinterval
Tab le 193 Configure the number of last member querying
Operation Command
Configure number of last member querying igmp robust-count
robust-value
Restore the default number of querying undo igmp robust-count
Tab le 194 Configuring the present time of IGMP querier
Operation Command
Change the present time of IGMP
querier
igmp timer other-querier-present
seconds
Restore the default value undo igmp timer other-querier-present
To Next Page