H3C S3100 Series Command Manual page 309

because multicast streams are transmitted only within the multicast VLAN. In addition, because the
multicast VLAN is isolated from user VLANs, this method also enhances the information security.
One port belongs to only one multicast VLAN.
The port connected to a user terminal must be a hybrid port.
The multicast member port must be in the same multicast VLAN with the router port. Otherwise, the
port cannot receive multicast packets.
If a router port is in a multicast VLAN, the router port must be configured as a trunk port or a hybrid
port that allows tagged packets to pass for the multicast VLAN. Otherwise, all the multicast
member ports in this multicast VLAN cannot receive multicast packets.
If a multicast member port needs to receive multicast packets forwarded by a router port that does
not belong to any multicast VLAN, the multicast member port must be removed from the multicast
VLAN. Otherwise, the port cannot receive multicast packets.
Examples
# Configure VLAN 2 as a multicast VLAN.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] vlan 2
[Sysname-vlan2] service-type multicast
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