292
Router port(s):total 1 port(s).
GE1/0/1 (D) ( 00:01:30 )
IP group(s):the following ip group(s) match to one mac group.
IP group address:FF1E::101
(::, FF1E::101):
Attribute: Host Port
Host port(s):total 2 port(s).
GE1/0/3 (D) ( 00:03:23 )
GE1/0/4 (D) ( 00:04:10 )
MAC group(s):
MAC group address:3333-0000-0101
Host port(s):total 2 port(s).
GE1/0/3
GE1/0/4
The output shows that GigabitEthernet 1/0/3 and GigabitEthernet 1/0/4 of Switch A have joined IPv6
multicast group FF1E::101.
Static port configuration example
Network requirements
As shown in Figure 71, 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 1/0/3
and GigabitEthernet 1/0/5 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 1/0/3 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 becomes blocked.
NOTE:
If no static router port is configured, when the path of Switch A—Switch B—Switch C becomes blocked, a
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. Namely, IPv6 multicast delivery will be interrupted
during this process.
For more information about the Spanning Tree Protocol (STP), see Layer 2—LAN Switching Configuration
Guide.
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