H3C Technologies H3C S3100V2 Series Switches - Manual (Page 89)

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Port flags: D-Dynamic port, S-Static port, C-Copy port
Subvlan flags: R-Real VLAN, C-Copy VLAN
Vlan(id):100.
Total 1 IP Group(s).
Total 1 IP Source(s).
Total 1 MAC Group(s).
Router port(s):total 1 port(s).
ETH1/0/1 (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).
Eth1/0/3 (D) ( 00:03:23 )
Eth1/0/4 (D) ( 00:04:10 )
MAC group(s):
MAC group address:3333-0000-0101
Host port(s):total 2 port(s).
Eth1/0/3
Eth1/0/4
The output shows that Ethernet 1/0/3 and Ethernet 1/0/4 of Switch A have joined IPv6 multicast group
FF1E::101.
Static port configuration example
Network requirements
• As shown in Figure 25 , Router A connects to an IPv6 multicast source—Source—through Ethernet
1/0/2, and to Switch A through Ethernet 1/0/1.
• MLDv1 runs on Router A, and MLDv1 snooping runs on Switch A, Switch B and Switch C, with
Router A acting as the MLD querier.
• Host A and host C are permanent receivers of IPv6 multicast group FF1E::101. Ethernet 1/0/3 and
Ethernet 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.
• You must configure Ethernet 1/0/3 that connects Switch A to 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 gets 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. Namely, IPv6 multicast delivery will be interrupted
during this process.
• For more information about the Spanning Tree Protocol (STP), see the Layer 2—LAN Switching
Configuration Guide.