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Metro Ethernet by Sam Halabi

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Understanding GMPLS

Generalized MPLS is a set of architectures and protocols that enables TDM and optical networks to behave more dynamically. GMPLS builds on the MPLS control, which is well known and proven to work, and extends the capabilities of MPLS to control TDM and optical networks, including TDM switches, wavelength switches, and physical port switches.

In the same way that MPLS builds label switched paths (LSPs) between packet switches, GMPLS extends the concept of LSPs to TDM and optical switches. Figure 7-1 illustrates a three-layer hierarchy where GMPLS LSPs are built between two points in the network over multiple layers.

Figure 7-1. GMPLS LSPs

Figure 7-1 shows how the MPLS LSP concept that is used for the IP packet/cell layer can ...

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