The suite of protocols that defines Multi-Protocol Label Switching is in the process of enhancement to generalize its applicability to the control of optical networks. One area of prime consideration is to use these eneralized MPLS protocols in upgrading the control plane of optical transport netwok This article describes those extensions to MPLS directed toward controlling SDH/SONET networks. SDH/SONET networks are ideal candidates for this process since they possess a rich multiplex

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... and a variety of protection/restoration options are well defined and widely deployed. Wediscuss theextensions toMPLS routing protocols to disseminate information needed for transport path computation and network operations, and the extensions to MPLS label distribution protocols needed for provisioning of transport circuits.