1-24Static Port Configuration ExampleNetwork requirementsz As shown in Figure 1-5, Router A connects to a multicast source (Source) through GigabitEthernet1/0/2, and to Switch A through GigabitEthernet 1/0/1.z IGMPv2 is to run on Router A, and IGMPv2 Snooping is to run on Switch A, Switch B and Switch C,with Router A acting as the IGMP querier.z Host A and host C are permanent receivers of multicast group 224.1.1.1. GigabitEthernet 1/0/3 andGigabitEthernet 1/0/5 on Switch C are required to be configured as static member ports formulticast group 224.1.1.1 to enhance the reliability of multicast traffic transmission.z Suppose STP runs on the network. To avoid data loops, the forwarding path from Switch A toSwitch C is blocked under normal conditions, and multicast traffic flows to the receivers attached toSwitch C only along the path of Switch A—Switch B—Switch C.z It is required to configure GigabitEthernet 1/0/3 that connects Switch A to Switch C as a staticrouter port, so that multicast traffic can flow to the receivers nearly uninterruptedly along the path ofSwitch A—Switch C in the case that the path of Switch A—Switch B—Switch C gets blocked.If no static router port is configured, when the path of Switch A—Switch B—Switch C gets blocked, atleast one IGMP query-response cycle must be completed before the multicast data can flow to thereceivers along the new path of Switch A—Switch C, namely multicast delivery will be interrupted duringthis process.Figure 1-5 Network diagram for static port configurationSource1.1.1.1/24 Router AIGMP querierGE1/0/110.1.1.1/24GE1/0/21.1.1.2/24Switch ASwitch CSwitch BGE1/0/1GE1/0/2GE1/0/2Host CHost B Host AReceiverReceiverGE1/0/5Configuration procedure1) Configure IP addresses
