Operation Manual – MulticastH3C S7500 Series Ethernet Switches Chapter 3 IGMP Snooping Configuration3-83.2.3 Enabling IGMP Fast LeaveNormally, when receiving an IGMP Leave message, the IGMP Snooping-enabledswitch does not immediately remove the port from the multicast group, but sends anIGMP group-specific query message. If no response is received in a given period, itthen removes the port from the multicast group.If the IGMP fast leave feature is enabled, when receiving an IGMP Leave message, theIGMP Snooping-enabled switch immediately removes the port from the multicast group.When a port has only one user, enabling the IGMP fast leave feature on the port cansave bandwidth.I. Enable the IGMP fast leave feature for all ports globallyFollow these steps to enable the IGMP fast leave feature for all ports globally:To do... Use the command... RemarksEnter system view system-view —Enable the fast leavefeature from the multicastgroup of the specificVLAN for all portigmp-snoopingfast-leave [ vlanvlan-list ]OptionalBy default, the fast leavefeature from a multicast groupfor all ports is disabled.II. Enable the fast leave feature for a portFollow these steps to enable the fast leave feature for a port:To do... Use the command... RemarksEnter system view system-view —Enter Ethernet port view interface interface-typeinterface-number —Enable the port to fastleave from the multicastgroup(s) of the specificVLAN(s)igmp-snoopingfast-leave [ vlan vlan-list ]OptionalBy default, the fast leavefeature is disabled.3.2.4 Configuring IGMP Snooping Filtering ACLsYou can configure multicast filtering ACLs on the switch ports connected to users so asto use the IGMP Snooping filtering feature to limit the multicast streams that the userscan access. With this feature, you can treat different VoD users in different ways byallowing them to access the multicast streams in different multicast groups.In practice, when a user orders a multicast program, an IGMP report message isgenerated. When the message is received on a switch, the switch checks the multicast
