IGMP Configuration Commands 613Parameterrobust-value: IGMP robust value, number of times the IGMP query router sendsIGMP group query message after it receives the IGMP Leave message from thehost. the value range is 2 to 5. The default value is 2.DescriptionUse the igmp robust-count command to set the number of times the IGMPquery router sends IGMP group query message after it receives the IGMP Leavemessage from the host.Use the undo igmp robust-count command to restore the default value.Related commands: igmp lastmember-queryinterval, display igmp interface.Example# Set the robust value at the Vlan-interface 10 to 3. system-viewSystem View: return to User View with Ctrl+Z.[SW8800]interface vlan-interface 10[3Com-Vlan-interface10] igmp robust-count 3igmp timerother-querier-presentSyntaxigmp timer other-querier-present secondsundo igmp timer other-querier-presentViewInterface viewParameterseconds: IGMP querier present timer value in second ranging from 1 to 131070.By default, the value is twice the value of IGMP query message interval, i.e., 120seconds.DescriptionUse the igmp timer other-querier-present command to configure the timer ofpresence of the IGMP querier.Use the undo igmp timer other-querier-present command to restore thedefault value.On a shared network, i.e., there are multiple multicast routers on the samenetwork segment, the query router (querier for short) takes charge of sendingquery messages periodically on the interface. If other non-queriers receive noquery messages within the valid period, the router will consider the previous queryto be invalid and the router itself becomes a querier.In IGMP version 1, the selection of a query is determined by the multicast routingprotocol. In IGMP version 2, the router with the smallest IP address on the sharednetwork segment acts as the querier.Related command: igmp timer query and display igmp interface.
