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along the path of Switch A—Switch B—Switch C. When this path is blocked, a minimum of one
IGMP query-response cycle must be completed before multicast data flows to the receivers
along the path of Switch A—Switch C. In this case, the multicast delivery is interrupted during
the process. For more information about the STP, see Layer 2—LAN Switching Configuration
Guide.
Configure GigabitEthernet 1/0/3 on Switch A as a static router port. Then, multicast data
uninterruptedly flows to the receivers along the path of Switch A—Switch C when the path of
Switch A—Switch B—Switch C is blocked.
Figure 13 Network diagram
Configuration procedure
1. Assign an IP address and subnet mask to each interface as shown in Figure 13. (Details not
shown.)
2. On Router A:
# Enable IP multicast routing.
<RouterA> system-view
[RouterA] multicast routing
[RouterA-mrib] quit
# Enable IGMP on GigabitEthernet 1/0/1.
[RouterA] interface gigabitethernet 1/0/1
[RouterA-GigabitEthernet1/0/1] igmp enable
[RouterA-GigabitEthernet1/0/1] quit
# Enable PIM-DM on GigabitEthernet 1/0/2.
[RouterA] interface gigabitethernet 1/0/2
[RouterA-GigabitEthernet1/0/2] pim dm
[RouterA-GigabitEthernet1/0/2] quit
3. Configure Switch A:
# Enable IGMP snooping globally.
<SwitchA> system-view
[SwitchA] igmp-snooping
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