Operation Manual – MulticastH3C S5500-EI Series Ethernet Switches Chapter 2 IGMP Snooping Configuration2-122.4.4 Configuring Simulated JoiningGenerally, a host running IGMP responds to IGMP queries from the IGMP querier. If ahost fails to respond due to some reasons, the multicast router may deem that nomember of this multicast group exists on the network segment, and therefore willremove the corresponding forwarding path.To avoid this situation from happening, you can enable simulated joining on a port ofthe switch, namely configure the port as a simulated member host for a multicast group.When an IGMP query is heard, the simulated host gives a response. Thus, the switchcan continue receiving multicast data.A simulated host acts like a real host, as follows:z When a port is configured as a simulated member host, the switch sends anunsolicited IGMP report through that port.z After a port is configured as a simulated member host, the switch responds toIGMP general queries by sending IGMP reports through that port.z When the simulated joining function is disabled on a port, the switch sends anIGMP leave group message through that port.Follow these steps to configure simulated joining:To do... Use the command... RemarksEnter system view system-view —Enter Ethernetport viewinterface interface-typeinterface-numberEnter thecorrespondingview Enter portgroup viewport-group { manualport-group-name |aggregation agg-id }Use eithercommandConfigure simulated (*, G) or (S,G) joiningigmp-snooping host-joingroup-address [ source-ipsource-address ] vlan vlan-idRequiredDisabled bydefaultNote:z Each simulated host is equivalent to an independent host. For example, whenreceiving an IGMP query, the simulated host corresponding to each configurationresponds respectively.z Unlike a static member port, a port configured as a simulated member host will ageout like a dynamic member port.
