206 CHAPTER 16: IGMP SNOOPING CONFIGURATIONIn Ethernet port viewIn VLAN viewConfiguring a Port as aSimulated GroupMemberGenerally, hosts running IGMP respond to the IGMP query messages of themulticast switch. If hosts fail to respond for some reason, the multicast switch mayconsider that there is no member of the multicast group on the local subnet andremove the corresponding path.To avoid this from happening, you can configure a port of the VLAN of the switchas a multicast group member. When the port receives IGMP query messages, themulticast switch will respond. As a result, the port of the VLAN can continue toreceive multicast traffic.Through this configuration, the following functions can be implemented:■ When an Ethernet port is configured as a simulated member host, the switchsends an IGMP report through this port. Meanwhile, the switch sends the sameIGMP report to itself and establishes a corresponding IGMP entry based on thisreport.■ When receiving an IGMP general query, the simulated host responds with anIGMP report. Meanwhile, the switch sends the same IGMP report to itself toensure that the IGMP entry does not age out.■ When the simulated joining function is disabled on an Ethernet port, thesimulated host sends an IGMP leave message.Therefore, to ensure that IGMP entries will not age out, the port must receiveIGMP general queries periodically.Table 156 Configure a static router port in Ethernet port viewOperation Command RemarksEnter system view system-view -Enter Ethernet port view interface interface-typeinterface-number-Configure the current portas a static router portmulticaststatic-router-port vlanvlan-idRequiredBy default, no static router port isconfigured.Table 157 Configure a static router port in VLAN viewOperation Command RemarksEnter system view system-view -Enter VLAN view vlan vlan-id -Configure a specified port as astatic router portmulticaststatic-router-portinterface-typeinterface-numberRequiredBy default, no static routerport is configured.Table 158 Configure a port as a simulated group memberOperation Command RemarksEnter system view system-view -Enter Ethernet port view interface interface-typeinterface-number-
