3Com 5500G-EI Command Reference Guide - Page 260

260 CHAPTER 7: USING MULTICAST PROTOCOL COMMANDS View VLAN Interface View Parameter seconds: 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., 120 seconds. Description Use the igmp timer other-querier-present command to configure the timer of presence of the IGMP querier. Use the undo igmp timer other-querier-present command to restore the default value. On a shared network, where there are multiple multicast routers on the same network segment, the query router (querier for short) takes charge of sending query messages periodically on the interface. If other non-queriers receive no query messages within the valid period, the router will consider the previous Querier to be invalid and the router itself becomes the querier. In IGMP version 1, the selection of a Querier is determined by the multicast routing protocol. In IGMP version 2, the router with the lowest IP address on the shared network segment acts as the querier. Related commands: igmp timer query and display igmp interface Example Set querier to expire after 300 seconds. system-view System View: return to User View with Ctrl+Z [SW5500]interface Vlan-interface 10 [SW5500-vlan-interface10]igmp timer other-querier-present 300 igmp timer query Syntax igmp timer query seconds undo igmp timer query View VLAN Interface View Parameter seconds: The interval, in seconds, at which a router transmits IGMP query messages in the range from 1 to 65535. By default, the value is 60 seconds. Description Use the igmp timer query command to configure the interval at which a router interface sends IGMP query messages. Use the undo igmp timer query command to restore the default value.