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

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7.3. GMPLS Signaling

Signaling was not part of the original IP network architecture—there was no need to establish a connection in an IP network before sending IP packets. With the advent of traffic engineering based on MPLS (denoted as MPLS-TE, see Chapter 5), the notion of explicitly routed Label Switched Paths (LSPs) came into being. Such LSPs, in essence, are connections over which IP (and potentially other protocol) packets can be carried from a source to a destination. Thus, traffic engineering applications over MPLS have made use of signaling protocols such as RSVP-TE and CR-LDP.

Generalized MPLS (or GMPLS) extends the basic MPLS-TE concepts to cover non-IP networks, in particular, optical networks. The rationale behind GMPLS was described ...

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