Survivable lightpath routing: a new approach to the design of WDM-based networks

Network restoration is often done at the electronic layer by rerouting traffic along a redundant path. With wavelength-division multiplexing (WDM) as the underlying physical layer, it is possible that both the primary and backup paths traverse the same physical links and would fail simultaneously in...

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Veröffentlicht in:IEEE journal on selected areas in communications Jg. 20; H. 4; S. 800 - 809
Hauptverfasser: Modiano, E., Narula-Tam, A.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.05.2002
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Algorithms
Computer networks
Failure
Formulations
Joining processes
Laboratories
Links
Network topology
Networks
Physical layer
Protection
Routing
Routing (telecommunications)
Studies
Telecommunication traffic
Topology
Wavelength assignment
Wavelength division multiplexing
Wavelength routing
WDM networks
ISSN:0733-8716, 1558-0008
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Zusammenfassung:Network restoration is often done at the electronic layer by rerouting traffic along a redundant path. With wavelength-division multiplexing (WDM) as the underlying physical layer, it is possible that both the primary and backup paths traverse the same physical links and would fail simultaneously in the event of a link failure. It is, therefore, critical that lightpaths are routed in such a way that a single link failure would not disconnect the network. We call such a routing survivable and develop algorithms for survivable routing of a logical topology. First, we show that the survivable routing problem is NP-complete. We then prove necessary and sufficient conditions for a routing to be survivable and use these conditions to formulate the problem as an integer linear program (ILP). Due to the excessive run-times of the ILP, we develop simple and effective relaxations for the ILP that significantly reduces the time required for finding survivable routings. We use our new formulation to route various logical topologies over a number of different physical topologies and show that this new approach offers a much greater degree of protection than alternative routing schemes such as shortest path routing and a greedy routing algorithm. Finally, we consider the special case of ring logical topologies for which we are able to find a significantly simplified formulation. We establish conditions on the physical topology for routing logical rings in a survivable manner.
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ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2002.1003045