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

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10.2. Differences between IP and Optical Routing

Although IP routing protocols are being extended for routing connections in optical networks, there are major differences between routing in circuit switched optical networks and routing in packet switched IP networks.

  • IP routing involves both control and data plane functionality. The function of the control plane is twofold: to distribute topology information throughout the network (link state routing) and to compute a forwarding table from the topology information. The actual forwarding of IP packets, using the forwarding table, is the function of the data plane. No connection is established ahead of time, and packets are forwarded hop by hop from the source to the destination. In optical networks, ...

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