H3C Technologies H3C S3100V2 Series Switches - Manual (Page 60)

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Figure 19 Port-based multicast VLAN
After the configuration, upon receiving an IGMP message on a user port, Switch A tags the message with
the multicast VLAN ID and relays it to the IGMP querier, so that IGMP snooping can uniformly manage
the router ports and member ports in the multicast VLAN. When forwarding multicast data to Switch A,
Router A needs to send only one copy of multicast traffic to Switch A in the multicast VLAN, and Switch
A distributes the traffic to all member ports in the multicast VLAN.
NOTE:
•
For more information about IGMP snooping, router ports, and member ports, see the chapter “IGMP
snooping configuration.”
• For more information about VLAN tags, see the Layer 2—LAN Switching Configuration Guide.
Multicast VLAN configuration task list
Complete the following tasks to configure multicast VLAN:
Task Remarks
Configuring user port attributes Required
Configuring multicast VLAN ports Required
Configuring port-based multicast VLAN
When you configure port-based multicast VLAN, you need to configure the attributes of each user port
and then assign the ports to the multicast VLAN.
NOTE:
•
A user port can be configured as a multicast VLAN port when if it is of the Ethernet or Layer 2 aggregate
interface type.
• In Ethernet interface view and Layer 2 aggregate interface view, the configuration is effective only on the
current interface. In port group view, the configuration is effective on all ports in the current port group.