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

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9.2. History of Routing

In this section, we review the routing architectures and their evolution in two of the largest networks in existence—the telephone network and the Internet. Routing in the circuit-switched telephone network is in many ways similar to routing connections in an optical network, which is also a circuit-switched network. Although some aspects of routing in the packet-switched Internet are similar to those of routing in telephone and optical networks, many differences exist. Different standards bodies are working on defining more sophisticated IP-centric routing protocols for routing connections in optical networks.

9.2.1. Routing in the Telephone Network

Figure 9-1 shows the architecture of today's telephone network [Briley83 ...

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