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We develop a new enhanced ILP design model that optimally designs a node-encircling p-cycle network. The new model takes advantage of the observation that NEPCs assigned solely for node-failure protection will inherently protect all two-hop segments of every multi-hop working lightpath. As a result, only single-hop working lightpaths need explicit span-failure protection in the conventional manner...
Core communication networks have seen significant traffic increases in recent years, and availability requirements also continue to increase. This fact has led to a wide array of network design improvements, particularly in the area of network survivability. The various survivability mechanisms and accompanying design models that have been developed use diverse strategies to provision spare capacity...
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