H3C Technologies H3C S12500 Series Switches - Manual (Page 322)

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Static port configuration example
Network requirements
As shown in Figure 82 , MLDv1 runs on Router A, and MLDv1 snooping runs on Switch A, Switch B and
Switch C. Router A acts as the MLD querier.
Host A and host C are permanent receivers of IPv6 multicast group FF1E::101. GigabitEthernet 3/0/3
and GigabitEthernet 3/0/5 on Switch C are required to be configured as static member ports for
multicast group FF1E::101 to enhance the reliability of multicast traffic transmission.
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 IPv6 multicast traffic flows to the receivers attached to Switch C
only along the path of Switch A—Switch B—Switch C. Configure GigabitEthernet 3/0/3 on Switch C as
a static router port, so that IPv6 multicast traffic can flow 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 is blocked.
NOTE:
If no static router port is configured, when the path of Switch A—Switch B—Switch C gets blocked, at least
one MLD query-response cycle must be completed before the IPv6 multicast data can flow to the receivers
along the new path of Switch A—Switch C. IPv6 multicast delivery will be interrupted during this process.
For more information about STP, see Layer 2—LAN Switching Configuration Guide.
Figure 82 Network diagram
Configuration procedure
1. Enable IPv6 forwarding and configure an IPv6 address and prefix length for each interface as
shown in
Figure 82 .
2. On Router A, enable IPv6 multicast routing, enable IPv6 PIM-DM on each interface, and enable
MLD on GigabitEthernet 3/1/1.
system-view
[RouterA] multicast ipv6 routing-enable
[RouterA] interface GigabitEthernet 3/1/1
Source
1::1/64
Router A
MLD querier
GE3/1/1
2001::1/64 GE3/1/2
1::2/64
Switch A
Switch C
Switch B
GE3/0/1
G
E
3/0
/2
G
E
3/
0/
3
G
E
3/0
/1
GE3/0/2
G
E
3/
0/
1
GE3/0/2
Host C
Host B Host A
Receiver
Receiver
G
E
3/0
/3
G
E
3/
0/
4
GE3/0/5