H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 338)

29-20
GE0/0/1 (D) ( 00:01:30 )
IP group(s):the following ip group(s) match to one mac group.
IP group address:224.1.1.1
(0.0.0.0, 224.1.1.1):
Attribute: Host Port
Host port(s):total 2 port.
GE0/0/3 (D) ( 00:03:23 )
GE0/0/4 (D) ( 00:03:23 )
MAC group(s):
MAC group address:0100-5e01-0101
Host port(s):total 2 port.
GE0/0/3
GE0/0/4
As shown above, GigabitEthernet 0/0/3 and GigabitEthernet 0/0/4 of AC have joined multicast group
224.1.1.1.
Static Router Port Configuration
Network requirements
z
As shown in Figure 29-4 , Router connects to a multicast source (Source) through GigabitEthernet
0/0/2, and to AC through GigabitEthernet 0/0/1.
z
IGMP is to run between Router and AC, and IGMP Snooping is to run on AC, Switch A, and Switch
B, with Router acting as the IGMP querier.
z
Suppose STP runs on the network. To avoid data loops, the forwarding path from AC to Switch B is
blocked under normal conditions, and multicast traffic flows to the receivers, Host A and Host C,
attached to Switch B only along the path of AC—Switch A—Switch B.
z
Now it is required to configure GigabitEthernet 0/0/3 that connects AC to Switch B as a static router
port, so that multicast traffic can flows to the receivers nearly uninterruptedly along the path of
AC—Switch B in the case that the path of AC—Switch A—Switch B gets blocked.
If no static router port is configured, when the path of AC—Switch A—Switch B 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 AC—Switch B, namely multicast delivery will be interrupted during this process.