3Com 5500G-EI Command Reference Guide - Page 257

IGMP Configuration Commands 257 For the related command, see igmp host-join port, igmp host-join, igmp group-policy. Example Add port GigabitEthernet 1/0/1 in VLAN-interface10 to the multicast group at 225.0.0.1. system-view System View: return to User View with Ctrl+Z. [SW5500]interface Vlan-interface 10 [SW5500-Vlan-interface10]igmp enable [SW5500-Vlan-interface10]quit [SW5500]interface GigabitEthernet 1/0/1 [SW5500-GigabitEthernet 1/0/1]port access vlan 10 [SW5500-GigabitEthernet 1/0/1]igmp host-join 225.0.0.1 vlan 10 igmp lastmember- Syntax queryinterval igmp lastmember-queryinterval seconds undo igmp lastmember-queryinterval View VLAN Interface View Parameter seconds: Time interval before IGMP query router sends the IGMP group query message after it receives the IGMP Leave message from the host. It is in the range of 1 to 5 seconds. By default, it is 1 second. Description Use the igmp lastmember-queryinterval command to set the time interval before IGMP query router sends the IGMP group query message after it receives the IGMP Leave message from the host. Use the undo igmp lastmember-queryinterval command to restore the default value. In the shared network, that is, a network segment including multiple hosts and multicast routers, the IGMP Querier is responsible for maintaining the IGMP group membership on the interface. When an IGMP v2 host leaves a group, it sends an IGMP Leave message. When the IGMP Leave message is received, the IGMP Querier must send an IGMP group specific query message a specified number of times (set using the igmp robust-count command, with a default value of 2) in a specified time interval. (Set using the igmp lastmember-queryinterval command, with default value of 1 second). If other hosts which are interested in the specified group receive the IGMP group specific query message from the IGMP Querier, they send back an IGMP Membership Report message within the specified maximum response time interval. If the IGMP Querier receives the IGMP Membership Report message within the defined period (equal to robust-value seconds), the IGMP Querier continues to maintain the membership of this group. When no IGMP Membership