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Optical Network Control: Architecture, Protocols, and Standards by Debanjan Saha, Bala Rajagopalan, Greg Bernstein

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10.5. Link Bundling

Link bundling has been proposed in the context of optical networks to improve the scalability of routing protocols. Neighboring nodes in an optical network are often connected by a large number of parallel links/fibers between them. With traditional IP routing protocols, each physical link between a pair of neighboring nodes constitute a routing adjacency. Hence, if there are N parallel links between two nodes, it will result in N routing adjacencies between them. Multiple parallel adjacencies severely limit scalability of routing protocols by creating unnecessary computational load on the network elements and superfluous control traffic.

In order to understand this problem better, let us consider the example in Figure 10-1 ...

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