1-7z IGMP Snooping must be enabled globally before it can be enabled in a VLAN.z When you enable IGMP Snooping in a specified VLAN, this function takes effect for the ports in thisVLAN only.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 IGMPv3messages, 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-numberOptionalVersion 2 by defaultIf you switch IGMP Snooping from version 3 to version 2, the system will clear all IGMP Snoopingforwarding entries from dynamic joins, and will:z Keep forwarding entries for version 3 static (*, G) joins;z Clear forwarding entries from version 3 static (S, G) joins, which will be restored when IGMPSnooping is switched back to version 3.For details about static joins, Refer to Configuring Static Ports.Configuring IGMP Snooping Port FunctionsConfiguration PrerequisitesBefore configuring IGMP Snooping port functions, complete the following tasks:z Enable IGMP Snooping in the VLAN or enable IGMP on the VLAN interfacez Configure the corresponding port groups.Before configuring IGMP Snooping port functions, prepare the following data:z Aging time of dynamic router ports,z Aging time of dynamic member ports, andz Multicast group and multicast source addresses
