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Appendix 5 - Routing algorithm

Published online by Cambridge University Press:  18 December 2009

Arun Somani
Affiliation:
Iowa State University
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Summary

A routing algorithm establishes an appropriate path from any given source to a destination. The objective of network routing is to maximize network throughput with minimal cost in terms of path length. To maximize throughput, a routing algorithm has to provide as many communication paths as possible. To minimize the cost of paths, the shortest paths have to be provided. However, there is always a trade-off between these two objectives. Most routing algorithms are based on assigning a cost measure to each link in a network. The cost could be a fixed quantity related to parameters such as the link length, the bandwidth of a link, or the estimated propagation delay. Each link has a cost associated with it and in most cases it is assumed that the links have equal cost.

An interconnection network is strictly non-blocking if there exists a routing algorithm to add a new connection without disturbing existing connections. A network is rearrangeable if its permitted states realize every permutation or allowable set of requests; here it is possible to rearrange existing connections if necessary. Otherwise it is blocking.

The store-and-forward operation in packet switching incurs a time delay and causes significant performance degradation. If the algorithm is used in a packet-switching network, the total time delay of a data packet is obtained by summing up the time delay at each intermediate node. Since non-availability of any link along a route causes the route not to be available, the network sees a high probability of blocking under heavy traffic, which rejects the incoming request and eventually causes data loss or delay.

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Publisher: Cambridge University Press
Print publication year: 2006

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  • Routing algorithm
  • Arun Somani, Iowa State University
  • Book: Survivability and Traffic Grooming in WDM Optical Networks
  • Online publication: 18 December 2009
  • Chapter DOI: https://doi.org/10.1017/CBO9780511616105.025
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  • Routing algorithm
  • Arun Somani, Iowa State University
  • Book: Survivability and Traffic Grooming in WDM Optical Networks
  • Online publication: 18 December 2009
  • Chapter DOI: https://doi.org/10.1017/CBO9780511616105.025
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Routing algorithm
  • Arun Somani, Iowa State University
  • Book: Survivability and Traffic Grooming in WDM Optical Networks
  • Online publication: 18 December 2009
  • Chapter DOI: https://doi.org/10.1017/CBO9780511616105.025
Available formats
×