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In IP over WDM multilayer optical networks, IP routers are interconnected by all-optical channels called lightpaths, of typical rates of 10, 40 or, more recently, 100 Gbps. In this context, Lightpath Bundling (LB) and Anycast Switching (AS) are control plane and data plane techniques respectively, both of them to be implemented in the IP routers. LB permits grouping a set of lightpaths between two nodes that follow a common route, so that they are perceived by the IP layer as a single virtual link of aggregated capacity. In its turn, AS consists of instructing the router to implement a per-packet-granularity balancing of the traffic among the lightpaths in the bundle, reducing the packet delay and the buffering requirements in the node.
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