3Com Switch 8800 Configuration Guide Chapter 27 IGMP Configuration27-5I. Configuring interval for querying IGMP packetsTable 27-4 Configuring interval for querying IGMP packetsOperation CommandConfigure interval for queryingIGMP packets igmp lastmember-queryinterval secondsRestore te default query interval undo igmp lastmember-queryintervalBy default, the interval is 1 second.II. Configuring the number of last member queryingTable 27-5 Configuring the number of last member queryingOperation CommandConfigure number of last member querying igmp robust-count robust-valueRestore the default number of querying undo igmp robust-countBy default, an IGMP group-specific query message is sent for twice.27.2.6 Configuring the Present Time of IGMP QuerierThe IGMP querier present timer defines the period of time before the router takes overas the querier sending query messages, after the previous querier has stopped doingso.Perform the following configuration in VLAN interface view.Table 27-6 Configuring the present time of IGMP querierOperation CommandChange the present time of IGMPquerierigmp timer other-querier-presentsecondsRestore the default value undo igmp timer other-querier-presentBy default, the value is 120 seconds. If the router has received no query messagewithin twice the interval specified by the igmp timer query command, it will regard theprevious querier invalid.27.2.7 Configuring Maximum Response Time for IGMP Query MessageWhen a router receives a query message, the host will set a timer for each multicastgroup it belongs to. The value of the timer is randomly selected between 0 and the
