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Survivable Routing of Mesh Topologies in IP-over-WDM Networks by Recursive Graph Contraction

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2 Author(s)
Kurant, M. ; Sch. of Commun. & Comput. Sci., EPFL, Lausanne ; Thiran, P.

Failure restoration at the IP layer in IP-over-WDM networks requires to map the IP topology on the WDM topology in such a way that a failure at the WDM layer leaves the IP topology connected. Such a mapping is called survivable. Finding a survivable mapping is known to be NP-complete, making it impossible in practice to assess the existence or absence of such a mapping for large networks, (i) we first introduce a new concept of piecewise survivability, which makes the problem much easier in practice (although still NP-complete), and allows us to formally prove that a given survivable mapping does or does not exist, (ii) secondly, we show how to trace the vulnerable areas in the topology, and how to strengthen them to enable a survivable mapping, (iii) thirdly, we give an efficient and scalable algorithm that finds a survivable mapping. In contrast to the heuristics proposed in the literature to date, our algorithm exhibits a number of provable properties (e.g., it guarantees the piecewise survivability) that are crucial for (i) and (ii)

Published in:

Selected Areas in Communications, IEEE Journal on  (Volume:25 ,  Issue: 5 )

Date of Publication:

June 2007

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