Compact forbidden-set routing

  • Authors:
  • Bruno Courcelle;Andrew Twigg

  • Affiliations:
  • LaBRI, Bordeaux 1 University and CNRS;Computer Laboratory, Cambridge University

  • Venue:
  • STACS'07 Proceedings of the 24th annual conference on Theoretical aspects of computer science
  • Year:
  • 2007

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Abstract

We study labelling schemes for X-constrained path problems. Given a graph (V,E) and X ⊆ V, a path is X-constrained if all intermediate vertices avoid X. We study the problem of assigning labels J(x) to vertices so that given {J(x) : x ∈ X} for any X ⊆ V, we can route on the shortest X-constrained path between x, y ∈ X. This problem is motivated by Internet routing, where the presence of routing policies means that shortest-path routing is not appropriate. For graphs of tree width k, we give a routing scheme using routing tables of size O(k2 log2 n). We introduce m-clique width, generalizing clique width, to show that graphs of m-clique width k also have a routing scheme using size O(k2 log2 n) tables.