H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – Multicast
H3C S7500E Series Ethernet Switches Chapter 2 IGMP Snooping Configuration
2-26
Host port(s):total 2 port.
Eth2/0/3
Eth2/0/4
As shown above, Ethernet 2/0/3 and Ethernet 2/0/4 of Switch A have joined multicast
group 224.1.1.1.
2.8.2 Static Router Port Configuration
I. Network requirements
z As shown in Figure 2-4, Router A connects to a multicast source (Source) through
Ethernet 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 B
and Switch C, with Router A acting as the IGMP querier.
z Suppose STP runs on the network. To avoid data loops, the forwarding path from
Switch A to Switch C is blocked under normal conditions, and multicast traffic
flows to the receivers, Host A and Host C, attached to Switch C only along the path
of Switch A—Switch B—Switch C.
z Now it is required to configure Ethernet 2/0/3 that connects Switch A to Switch C
as a static router port, so that multicast traffic can flows to the receivers nearly
uninterruptedly along the path of Switch A—Switch C in the case that the path of
Switch A—Switch B—Switch C gets blocked.
 Note:
If no static router port is configured, when the path of Switch A—Switch B—Switch C
gets blocked, at least one IGMP query-response cycle must be completed before the
multicast data can flow to the receivers along the new path of Switch A—Switch C,
namely multicast delivery will be interrupted during this process.