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<p>S. Badr and P. Podar (1989) introduced a zig-zag routing policy and showed its optimality for shortest-path routing on square or infinite grid networks with independent link failures. This paper shows that, contrary to the claim of Badr and Podar, a zig-zag policy is not optimal for shortest-path routing on torus networks.</p>
network routing; multiprocessor interconnection networks; dynamic programming; optimal shortest-path routing policy; network computers; regular mesh-connected topologies; zig-zag routing policy; infinite grid networks; torus networks.

T. Weller and B. Hajek, "Comments on "An Optimal Shortest-Path Routing Policy for Network Computers with Regular Mesh-Connected Topologies"," in IEEE Transactions on Computers, vol. 43, no. , pp. 862-863, 1994.
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