Operation Manual – MulticastH3C S5500-EI Series Ethernet Switches Chapter 6 IGMP Configuration6-13To do... Use the command... DescriptionConfigure the maximumresponse time for IGMPgeneral queriesigmpmax-response-timeintervalOptional10 seconds by defaultConfigure the IGMP lastmember query intervaligmplast-member-query-interval intervalOptional1 second by defaultConfigure the otherquerier present intervaligmp timerother-querier-presentintervalOptionalFor the system default,see “Note” below.Note:z If not statically configured, the other querier present interval is [ IGMP query interval ]times [ IGMP robustness variable ] plus [ maximum response time for IGMP generalqueries ] divided by two. By default, the values of these three parameters are 60(seconds), 2 and 10 (seconds) respectively, so the default value of the other querierpresent interval = 60 × 2 + 10 / 2 = 125 (seconds).z If statically configured, the other querier present interval takes the configured value.Caution:z Make sure that the other querier present interval is greater than the IGMP queryinterval; otherwise the IGMP querier may change frequently on the network.z Make sure that the IGMP query interval is greater than the maximum response timefor IGMP general queries; otherwise, multicast group members may be wronglyremoved.z The configurations of the maximum response time for IGMP general queries, theIGMP last member query interval and the IGMP other querier present interval areeffective only for IGMPv2 or IGMPv3.6.4.4 Configuring IGMP Fast Leave ProcessingFast leave processing is implemented by IGMP Snooping. For details, see ConfiguringFast Leave Processing.
