Abstract
Generalized Multiprotocol Label Switching (GMPLS) is a set of extensions to Multiprotocol Label Switching (MPLS) traffic engineering signaling protocols and to traffic engineering routing protocols to provide a common, standardized suite for controlling core networks. GMPLS is built on MPLS because the switching notions are very similar and there is benefit in leveraging the proven technology of MPLS. Its signaling is built on MPLS-TE signaling. This is not just a convenience that reduces the amount of new protocol development required, but it reflects the fact that GMPLS as a concept grew out of MPLS-TE and uses many of the same terms and concepts. MPLS has two defined signaling protocols, both of which have been extended for use in GMPLS. One new protocol, the Link Management Protocol (LMP), is defined as part of GMPLS. LMP allows adjacent switches to discover, configure, and monitor the data links that join them. It should be emphasized that GMPLS is a superset of MPLS—that is, all of the functions that are defined for MPLS are available in GMPLS as well. The control plane additions that are made to MPLS to support other media apart from packet switching are also explored.
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