44
Figure 18 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
"
•
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 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.