3Com Switch 8800 Configuration Guide Chapter 24 IGMP Snooping Configuration24-5Table 24-1 Enabling/Disabling IGMP SnoopingOperation CommandEnable/disable IGMP Snooping igmp-snooping { enable | disable }By default, IGMP Snooping is disabled.Caution:z Although layer 2 and layer 3 multicast protocols can be configured in pair, theycannot run on the same VLAN or its corresponding VLAN interface at the same time.For example, if PIM or IGMP is enabled on a VLAN, then IGMP Snooping cannotoperate on this VLAN.z IGMP Snooping functions only when it is enabled both in system view and in VLANview. Otherwise, IGMP Snooping does not take effect.24.2.2 Configuring Router Port Aging TimeThis task is to manually configure the router port aging time. If the switch has notreceived any general query message from the router before the router port is aged, itwill remove the port from all MAC multicast groups.Perform the following configuration in system view.Table 24-2 Configuring router port aging timeOperation CommandConfigure router port aging time igmp-snooping router-aging-time secondsRestore the default aging time undo igmp-snooping router-aging-timeBy default, the port aging time is 105s.24.2.3 Configuring Maximum Response TimeThis task is to manually configure the maximum response time. If the Ethernet switchreceives no report message from a port in the maximum response time, it will removethe port from the multicast group.Perform the following configuration in system view.
