H3C Technologies H3C S12500 Series Switches - Manual (Page 51)

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Static port configuration example
Network requirements
As shown in Figure 15 , IGMPv2 runs on Router A, and IGMPv2 snooping runs on Device A, Device B and
Device C. Router A acts as the IGMP querier.
Host A and host C are permanent receivers of multicast group 224.1.1.1. GigabitEthernet 3/0/3 and
GigabitEthernet 3/0/5 on Device C are required to be configured as static member ports for multicast
group 224.1.1.1 to enhance the reliability of multicast traffic transmission.
Suppose STP runs on the network. To avoid data loops, the forwarding path from Device A to Device C
is blocked under normal conditions, and multicast traffic flows to the receivers attached to Device C only
along the path of Device A—Device B—Device C. Configure GigabitEthernet 3/0/3 on Device A as a
static router port, so that multicast traffic can flow to the receivers nearly uninterruptedly along the path
of Device A—Device C in the case that the path of Device A—Device B—Device C gets blocked.
NOTE:
If no static router port is configured, when the path of Device A—Device B—Device 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 Device A—Device C. Multicast delivery will be interrupted during this process.
For more information about the STP, see Layer 2—LAN Switching Configuration Guide.
Figure 15 Network diagram
Configuration procedure
1. Configure an IP address and subnet mask for each interface as shown in Figure 15 . (Details not
shown.)
2. On Router A, enable IP multicast routing, enable PIM-DM on each Layer 3 interface, and enable
IGMP on GigabitEthernet 3/0/1.
<RouterA> system-view
Source
1.1.1.1/24
Router A
IGMP querier
GE3/0/1
10.1.1.1/24 Device A
Device B
Device C
GE3/0/1
GE
3/0
/2
GE3
/0/3
GE
3/0
/1
GE3
/0/1
GE3
/0/3
GE
3/0
/5
Host A
Receiver
Host B
Host C
Receiver
VLAN 100
GE3/0/2
1.1.1.2/24