3Com Switch 8800 Configuration Guide Chapter 24 IGMP Snooping Configuration24-6Table 24-3 Configuring the maximum response timeOperation CommandConfigure the maximum responsetimeigmp-snooping max-response-timesecondsRestore the default setting undo IGMP-snooping max-response-timeBy default, the maximum response time is 1 seconds.24.2.4 Configuring Aging Time of Multicast Group Member PortsThis task is to manually set the aging time of the multicast group member port. If theswitch receives no multicast group report message during the member port aging time,it will transmit the specific query message to that port and starts a maximum responsetimer.Perform the following configuration in system view.Table 24-4 Configuring aging time of the multicast member portsOperation CommandConfigure aging time of themulticast member igmp-snooping host-aging-time secondsRestore the default setting undo igmp-snooping host-aging-timeBy default, the aging time of the multicast member is 260 seconds.24.2.5 Configuring Unknown Multicast Packets not Broadcasted within aVLANThis configuration task is to enable/disable the function of not broadcasting unknownmulticast packets within a VLAN. If this function is not enabled but IGMP snoopingenabled on VLAN, multicast packets are broadcasted on within the VLAN when thedestination broadcast group has no member ports. When this function is enabled,however, multicast packets are only forwarded to the router port, but not broadcastedwithin the VLAN if no member port exists. Since the router port is that connected to therouter with IGMP/PIM enabled and the router sends regularly IGMP Query and PIMHello packets, the switch can identify the router port. If there is no router port, multicastpackets shall be dropped, instead of being forwarded.
