Dell PowerConnect 55xx Systems User Guide 527Multicast TV VLANThis section describes the Multicast TV VLAN feature.It contains the following sections:• Multicast TV VLAN Overview• Multicast TV VLAN Membership• Multicast TV VLAN MappingMulticast TV VLAN OverviewThe Multicast TV VLAN feature provides the ability to supply Multicasttransmissions to Layer 2-isolated subscribers, without replicating theMulticast transmissions for all subscriber VLANs. The subscribers are theonly receivers of the Multicast transmissions.• A Multicast TV VLAN can be defined for an Access port (a port that isin Access mode for VLAN membership).• All static VLANs are permitted to be a Multicast-TV VLAN.• The configuration is performed per port.One or more IP Multicast address groups can be associated with a MulticastVLAN. The source port must belong to the Multicast VLAN. Source andreceiver ports do not have to be members of the same VLAN.An end port is defined as a receiver port for the Multicast VLAN. Receivingports can belong to a single user VLAN and additionally to one MulticastVLAN. The receiver port can be an access member in any VLAN, but not inthe defined Multicast VLAN. In Multicast VLAN, the receiver port can onlyreceive traffic and not send traffic on it. Receivers of same Multicast VLANare isolated in different User (Access port) VLANs and therefore isolated fromeach other.If a Multicast-TV VLAN is defined on an access port, then:• The access port joins the Multicast-TV VLAN.• The Multicast-TV VLAN on the receiver port is always untagged.• The acceptable frame type of the port is set to Admit Untagged Only.
