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The Virtual Concatenation protocol in SONET/SDH has ushered in a novel routing paradigm that enables a circuit to be "Split" and routed over multiple paths. However, this diverse routing causes differential delay among the paths which can impact service if not accounted for in the routing. This paper introduces the differential delay aware routing problem and shows that it is not only NP-complete but is also provably hard to approximate within a constant factor. However, by transforming it into a flow routing formulation, one can derive effective, practical solutions. The paper presents various algorithms and uses extensive simulations to show that they are a good match to an "Ideal" integer linear programming formulation.

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