Operation Manual – MulticastH3C S7500E Series Ethernet Switches Chapter 2 IGMP Snooping Configuration2-26Host port(s):total 2 port.Eth2/0/3Eth2/0/4As shown above, Ethernet 2/0/3 and Ethernet 2/0/4 of Switch A have joined multicastgroup 224.1.1.1.2.8.2 Static Router Port ConfigurationI. Network requirementsz As shown in Figure 2-4, Router A connects to a multicast source (Source) throughEthernet 1/0/2, and to Switch A through Ethernet 1/0/1.z IGMP is to run on Router A, and IGMP Snooping is to run on Switch A, Switch Band Switch C, with Router A acting as the IGMP querier.z Suppose STP runs on the network. To avoid data loops, the forwarding path fromSwitch A to Switch C is blocked under normal conditions, and multicast trafficflows to the receivers, Host A and Host C, attached to Switch C only along the pathof Switch A—Switch B—Switch C.z Now it is required to configure Ethernet 2/0/3 that connects Switch A to Switch Cas a static router port, so that multicast traffic can flows to the receivers nearlyuninterruptedly along the path of Switch A—Switch C in the case that the path ofSwitch A—Switch B—Switch C gets blocked.Note:If no static router port is configured, when the path of Switch A—Switch B—Switch Cgets blocked, at least one IGMP query-response cycle must be completed before themulticast data can flow to the receivers along the new path of Switch A—Switch C,namely multicast delivery will be interrupted during this process.
