, Volume 43, Issue 1–2, pp 17–41 | Cite as

Building Edge-Failure Resilient Networks



We consider the design of resilient networks that are fault tolerant against link failures. Resilience against link failures can be built into the network by providing backup paths, which are used in the eventuality of an edge failure occurring on a primary path in the network. We consider several network design problems in this context; these problems are motivated by the requirements of current high-speed optical networks. In all the following problems the objective is to provide resilience in networks while minimizing the cost incurred. The main problem under consideration in this paper is that of backup allocation: this problem takes as its input an already provisioned primary network and a parameter k, and allocates backup capacity on the edges of the underlying network so that all the demand can be routed even in the presence of k edge failures. We also consider a variant of this problem where the primary network has a tree topology, and it is required that the restored network retains a tree topology. We then address the problem of simultaneous primary and backup allocation: we are given specifications of the traffic to be handled, and the goal is to provision both the primary as well as the backup network. Finally, we investigate a single-commodity problem motivated by a pragmatic scenario in which the primary network is not known in advance and demands between source--sink pairs arrive online.

Network design Link failure Backup path Restoration Approximation algorithm 


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Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Bell Labs, Lucent Technologies, 600-700 Mountain Avenue, Murray Hill, NJ 07974USA
  2. 2.Department of Computer Science, Carnegie Mellon University, Pittsburgh, PA 15213USA
  3. 3.Department of Computer Science, Indian Institute of Technology, Hauz Khas, New Delhi, 110016India
  4. 4.Computer Science Department, Technion, Israel Institute of Technology, Haifa 32000Israel

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