Packet Guide to Routing and Switching by Hartpence Bruce

Author:Hartpence, Bruce [Bruce Hartpence]
Language: eng
Format: epub
Tags: COMPUTERS / Networking / Network Protocols
ISBN: 9781449315245
Publisher: O'Reilly Media
Published: 2011-08-24T16:00:00+00:00

The Rapid Spanning Tree Protocol

The Spanning Tree Protocol from IEEE 802.1D is highly effective at eliminating loops but very slow at converging in other situations such as recovering pathways. Most organizations do not depend on spanning tree or other Layer 2 solutions for redundancy, load balancing or failover. Routers often replace switches where these features are desired. Cisco added improvements such as portfast, uplinkfast and backbonefast address either slow convergence or port state transitions though not all of these are in regular use.

The Rapid Spanning Tree Protocol (RSTP), which is standardized in IEEE 802.1w, improves the performance of the original spanning tree and incorporates many of the functions seen in the Cisco enhancements. In addition, it is fast enough to become a dependable component of some robust, highly reliable networks.

A couple of the significant changes include:

Switches quickly purge old information once new data is received

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