Operation Manual – Multicast ProtocolH3C S9500 Series Routing Switches Chapter 2 IGMP Snooping Configuration2-2Internet / IntranetVideo streamVOD ServerLayer 2 Ethernet SwitchVideo streamMulticast group member Non-multicastgroup memberMulticast routerVideo stream Video streamVideo streamNon-multicastgroup memberFigure 2-2 Multicast packet transmission when IGMP Snooping runs2.1.2 Implement IGMP SnoopingI. Related concepts of IGMP SnoopingTo facilitate the description, this section first introduces some related switch concepts ofIGMP Snooping.z Router Port: The port of the switch, directly connected to the multicast router.z Multicast member port: The Ethernet switch port connected to the multicastmember. The multicast member refers to a host joined a multicast group.z MAC multicast group: The multicast group is identified with MAC multicastaddress and maintained by the Ethernet switch.z Router port aging time: Time set on the router port aging timer. If the switch hasnot received any IGMP general query message when the timer times out, itconsiders the port no longer as a router port.z Multicast group member port aging time: When a port joins an IP multicast group,the aging timer of the port will begin timing. The multicast group member portaging time is set on this aging timer. If the switch has not received any IGMP reportmessage when the timer times out, it transmits IGMP specific query message tothe port.z Maximum response time: When the switch transmits IGMP specific querymessage to the multicast member port, the Ethernet switch starts a response timer,which times before the response to the query. If the switch has not received anyIGMP report message before the timer times out, it will remove the port from themulticast member ports
