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• Suppose the STP runs on the network. To avoid data loops, the forwarding path from Switch A to
Switch C is blocked under normal conditions. IPv6 multicast data flows to the receivers attached to
Switch C only along the path of Switch A—Switch B—Switch C. When this path is blocked, at least
one MLD query-response cycle must be completed before IPv6 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.
Figure 71 Network diagram
Configuration procedure
1. Assign an IPv6 address and prefix length to each interface according to Figure 71. (Details not
shown.)
2. Configure Router A:
# Enable IPv6 multicast routing.
<RouterA> system-view
[RouterA] ipv6 multicast routing
[RouterA-mrib6] quit
# Enable MLD on GigabitEthernet 2/1/1.
[RouterA] interface gigabitethernet 2/1/1
[RouterA-GigabitEthernet2/1/1] mld enable
[RouterA-GigabitEthernet2/1/1] quit
# Enable IPv6 PIM-DM on GigabitEthernet 2/1/2.
[RouterA] interface gigabitethernet 2/1/2
[RouterA-GigabitEthernet2/1/2] ipv6 pim dm
[RouterA-GigabitEthernet2/1/2] quit
3. Configure Switch A:
# Enable MLD snooping globally.
<SwitchA> system-view
[SwitchA] mld-snooping
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