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Local Area High Speed Networks by Dr. Sidnie Feit

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Chapter 13. The Spanning Tree Protocol

The cost of Spanning Tree Protocol (STP) extra equipment often is negligible compared to the cost of a network failure. The usual way to prevent network failures is to install extra equipment and extra network links. However, as discussed in Chapter 12, "Ethernet Bridges and Layer 2 Switches," multiple paths leading to the same LAN destination form loops that cause bridges to crash.

If redundant LAN paths are created, some must be placed in backup mode. If these paths are needed to cope with a network failure, they must be upgraded to active status.

Manually controlling the topology of a big, complicated LAN can be a tough jobe—specially since several administrators may be allowed to add and remove ...

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