1-10Follow these steps to configure simulated joining:To do... Use the command... RemarksEnter system view system-view —interface interface-typeinterface-numberEnter Ethernet port/Layer 2aggregate port view or portgroup view port-group manual port-group-nameRequiredUse either approachConfigure simulated (*, G) or(S, G) joiningigmp-snooping host-joingroup-address [ source-ipsource-address ] vlan vlan-idRequiredDisabled by defaultz Each simulated host is equivalent to an independent host. For example, when receiving an IGMPquery, the simulated host corresponding to each configuration responds respectively.z Unlike a static member port, a port configured as a simulated member host will age out like adynamic member port.Configuring Fast Leave ProcessingThe fast leave processing feature allows the switch to process IGMP leave messages in a fast way.With the fast leave processing feature enabled, when receiving an IGMP leave message on a port, theswitch immediately removes that port from the outgoing port list of the forwarding table entry for theindicated group. Then, when receiving IGMP group-specific queries for that multicast group, the switchwill not forward them to that port.In VLANs where only one host is attached to each port, fast leave processing helps improve bandwidthand resource usage. However, if fast leave processing is enabled on a port to which more than one hostis attached, when one host leaves a multicast group, the other hosts attached to the port and interestedin the same multicast group will fail to receive multicast data for that group. Therefore, if the function ofdropping unknown multicast traffic is already enabled on the switch or in the VLANs, the fast leaveprocessing function should not be enabled.Configuring fast leave processing globallyFollow these steps to configure fast leave processing globally:To do... Use the command... RemarksEnter system view system-view —Enter IGMP Snooping view igmp-snooping —Enable fast leave processing fast-leave [ vlan vlan-list ] RequiredDisabled by default
