Comments on "An Optimal Shortest-Path Routing Policy for Network Computers with Regular Mesh-Connected Topologies"
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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. >
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[2] Hussein G. Badr,et al. An Optimal Shortest-Path Routing Policy for Network Computers with Regular Mesh-Connected Topologies , 1989, IEEE Trans. Computers.