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Advances in optical equipment permit network carriers to offer lightpath-on-demand services to Internet Service Providers (ISPs). These services are the key for constructing cost-efficient Virtual Topology Capacity Adjustment (VTCA) schemes, where ISPs dynamically adapt the number of lightpaths contracted between their IP routers, according to time-varying traffic volumes. An existing technique called lightpath bundling offers ISPs the possibility of grouping lightpaths between the same pair of routers into so-called bundles, perceived by the IP layer as single virtual links of aggregated capacity.
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