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z The VLAN to be configured as a multicast VLAN must exist.
z The VLANs to be configured as sub-VLANs of the multicast VLAN must exist and must not be
sub-VLANs of another multicast VLAN.
z The total number of sub-VLANs of a multicast VLAN must not exceed 63.
Configuring Port-Based Multicast VLAN
When configuring port-based multicast VLAN, you need to configure the attributes of each user port and
then assign the ports to the multicast VLAN.
z A user port can be configured as a multicast VLAN port only if it is of the Ethernet or Layer 2
aggregate port type.
z Configurations made in Ethernet port view are effective only for the current port; configurations
made in Layer 2 aggregate port view are effective only for the current port; configurations made in
port group view are effective for all the ports in the current port group.
Configuration Prerequisites
Before configuring port-based multicast VLAN, complete the following tasks:
z Create VLANs as required
z Enable IGMP Snooping in the VLAN to be configured as a multicast VLAN
z Enable IGMP Snooping in all the user VLANs
Configuring User Port Attributes
Configure the user ports as hybrid ports that permit packets of the specified user VLAN to pass, and
configure the user VLAN to which the user ports belong as the default VLAN.
Configure the user ports to permit packets of the multicast VLAN to pass and untag the packets. Thus,
upon receiving multicast packets tagged with the multicast VLAN ID from the upstream device, the
Layer 2 device untags the multicast packets and forwards them to its downstream device.
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