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Spanning Tree Concepts A-1

Spanning Tree Concepts

A.1 GENERAL

The IEEE 802.1D Spanning Tree Protocol resolves the problems of physical loops in a network by

establishing one primary path between any two switches in a network. Any duplicate paths are

barred from use and become standby or blocked paths until the original path fails, at which point

they can be brought into service.

A.1.1 Spanning Tree Features

The switch meets the requirements of the Spanning Tree Protocol (STP) by BEING ABLE TO

performing the following functions:

• Create a single spanning tree from any arrangement of switching or bridging elements.

• Compensate automatically for the failure, removal, or addition of any device in an active data

path.

• Achieve port changes in short time intervals, which establishes a stable active topology quickly

with a minimum of network disturbance.

• Use a minimum amount of communications bandwidth to accomplish the operation of the

Spanning Tree Protocol.

• Reconfigure the active topology in a manner that is transparent to stations transmitting and

receiving data packets.

• Manage the topology in a consistent and reproducible manner through the use of Spanning Tree

Protocol parameters.

NOTE: The term “switch” is used as an equivalent to “bridge” in this document.

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