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Valiant Load-Balancing in Backbone Networks

Valiant Load-Balancing in Backbone Networks. Rui Zhang-Shen rzhang@stanford.edu. MS&E 319 — Feb 6, 2006. Backbone Networks: Observations. A few tens of “core” nodes, Each aggregating traffic for a region, Interconnected by an increasingly rich mesh of long-haul optical trunks Robustness

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Valiant Load-Balancing in Backbone Networks

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  1. Valiant Load-Balancing in Backbone Networks Rui Zhang-Shen rzhang@stanford.edu MS&E 319 — Feb 6, 2006

  2. Backbone Networks: Observations • A few tens of “core” nodes, • Each aggregating traffic for a region, • Interconnected by an increasingly rich mesh of long-haul optical trunks • Robustness • Load-balancing • Low utilization—links over-provisioned for • Uncertainty of traffic matrix the network is designed for • Headroom for future growth • Prepare to take over when links or routers fail • Minimize congestion and delay variation • Efficiency sacrificed for robustness and flexibility

  3. Our Approach • Assume we know or estimate the traffic entering and leaving each Regional Network • Requires only local knowledge of users and market estimates • Connect regional nodes by a logical full-mesh • Use Valiant Load Balancing (VLB) over whole network • Can support all traffic matrices • Efficient use of capacity

  4. Valiant Load-Balancing 2r/N r 1 2 r 4 2 3 N 4 … r r

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