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Chapter 9. Network Survivability > 9.1 Basic Concepts

9.1 Basic Concepts

A great variety of protection schemes are used in today’s networks, and the notions of working paths and protect paths are fundamental to understanding them. Working paths carry traffic under normal operation; protect paths provide an alternate path to carry the traffic in case of failures. Working and protection paths are usually diversely routed so that both paths are not lost in case of a single failure.

Protection schemes are designed to operate over a range of network topologies. Some work on point-to-point links. Ring topologies are especially popular in SONET/SDH. A ring is the simplest topology offering an alternate route around a failure. In the optical layer, many protection schemes have been designed to operate over true mesh topologies.


  

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