Dell PowerEdge VRTX - Manual (Page 19)

Features 19
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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 359.
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 287.
Fast Link
STP can take 30–60 seconds to converge. During this time, STP detects
possible loops, enabling time for status changes to propagate and for relevant
devices to respond. This period of 30-60 seconds is considered too long a
response time for many applications. The Fast Link option bypasses this
delay, and can be used in network topologies, where forwarding loops do not
occur.
For more information on enabling Fast Link for ports and LAGs, see "STP
Port Settings" on page 292.
IEEE 802.1w Rapid Spanning Tree
Spanning Tree takes 30–60 seconds for each host to decide whether its ports
are actively forwarding traffic. Rapid Spanning Tree (RSTP) detects uses of
network topologies to enable faster convergence, without creating forwarding
loops.
For more information, see "Spanning Tree" on page 287.