6-6z Although both Layer 2 and Layer 3 multicast protocols can run on the same switch simultaneously,they cannot run simultaneously on a VLAN or its corresponding VLAN interface.z Before enabling IGMP Snooping in a VLAN, be sure to enable IGMP Snooping globally in systemview; otherwise the IGMP Snooping settings will not take effect.z If IGMP Snooping and VLAN VPN are enabled on a VLAN at the same time, IGMP queries arelikely to fail to pass the VLAN. You can solve this problem by configuring VLAN tags for queries.For details, see Configuring a VLAN Tag for Query Messages.Configuring the Version of IGMP SnoopingBy configuring an IGMP snooping version, you actually configure the version of IGMP messages thatIGMP snooping can process.z IGMP snooping version 2 can process IGMPv1 and IGMPv2 messages, but not IGMPv3 messages,which will be flooded in the VLAN.z IGMP snooping version 3 can process IGMPv1, IGMPv2 and IGMPv3 messages.Follow these steps to configure the version of IGMP Snooping:To do... Use the command... RemarksEnter system view system-view —Enter VLAN view vlan vlan-id —Configure the version of IGMPSnoopingigmp-snooping versionversion-numberOptionalThe default IGMP Snoopingversion is version 2.z Before configuring related IGMP Snooping functions, you must enable IGMP Snooping in thespecified VLAN.z Different multicast group addresses should be configured for different multicast sources becauseIGMPv3 Snooping cannot distinguish multicast data from different sources to the same multicastgroup.Configuring TimersThis section describes how to configure the aging timer of the router port, the aging timer of themulticast member ports, and the query response timer.
