Spanning Tree Protocol Features - Dell PowerConnect 5548P System User's Manual

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forwarded. Non-VoIP traffic is dropped from the Voice VLAN in Auto-Voice
VLAN Secure mode. Voice VLAN also provides QoS to VoIP , ensuring that the
quality of voice does not deteriorate if the IP traffic is received unevenly.
For more information, see "Voice VLAN" on page 499.
Guest VLAN
Guest VLAN provides limited network access to unauthorized ports. If a port
is denied network access via port-based authorization, but the Guest VLAN is
enabled, the port receives limited network access through the Guest VLAN.
For more information, see "Dot1x Authentication" on page 132.
Private VLAN
The Private VLAN feature provides Layer 2 isolation between ports that share
the same Broadcast domain, or in other words, it creates a point-to-
multipoint Broadcast domain. The ports can be located anywhere in the
Layer 2 network (compared to the Protected Ports feature, where the ports
must be in the same stack).
For more information, see "Private VLAN" on page 495.
Multicast TV VLAN
The Multicast TV VLAN feature provides the ability to supply multicast
transmissions to Layer 2-isolated subscribers, without replicating the
multicast transmissions for each subscriber VLAN. The subscribers are the
only receivers of the multicast transmissions.
For more information, see "Multicast TV VLAN" on page 536.

Spanning Tree Protocol Features

Spanning Tree Protocol (STP)
802.1d Spanning tree is a standard Layer 2 switch requirement that enables
bridges to automatically prevent and resolve Layer 2 forwarding loops.
Switches exchange configuration messages using specifically-formatted
frames, and selectively enable and disable forwarding on ports.
For more information, see "Spanning Tree" on page 435.
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Dell PowerConnect 55xx Systems User Guide