Operation Manual – MulticastH3C S7500 Series Ethernet Switches Chapter 3 IGMP Snooping Configuration3-6Caution:An IGMP Snooping-enabled S7500 Ethernet switch judges whether the multicast groupexists when it receives an IGMP leave message sent by a host in a multicast group. Ifthis multicast group does not exist, the switch will drop the IGMP leave messageinstead of forwarding it.3.2 IGMP Snooping ConfigurationComplete the following tasks to configure IGMP Snooping:Task RemarksEnabling IGMP Snooping RequiredConfiguring Timers OptionalEnabling IGMP Fast Leave OptionalConfiguring IGMP Snooping Filtering ACLs OptionalConfiguring to Limit the Number of Multicast Groups on a Port OptionalConfiguring Suppression on IGMP Report Messages OptionalConfiguring Multicast VLAN Optional3.2.1 Enabling IGMP SnoopingYou can use the command here to enable IGMP Snooping so that it can establish andmaintain forwarding tables for MAC multicast groups at layer 2.Follow these steps to enable IGMP Snooping:To do... Use the command... RemarksEnter system view system-view —Enable IGMP Snoopingglobally igmp-snooping enableRequiredBy default, IGMP Snooping isdisabled globally.Enter VLAN view vlan vlan-id —Enable IGMP Snoopingin the VLAN igmp-snooping enableRequiredBy default, IGMP Snooping isdisabled in the VLAN.
