Generalized multiprotocol label switching: An overview of routing and management enhancements

Generalized multiprotocol label switching, also referred to as multiprotoco l lambda switching, supports not only devices that perform packet switching , but also those that perform switching in the time, wavelength. and space domains. The development of GMPLS requires modifications to current signali ng and routing protocols. It has also triggered the development of new prot ocols such as the Link Management Protocol. In this article, we present the traffic engineering enhancements to the Open Shortest Path First Internet routing protocol [1] and ISIS Intradomain Routing Protocol ([2, 3]) two pop ular routing protocols, to support GMPLS. We present the concepts of genera lized interfaces, label-switched path hierarchy, and link bundling intended to improve GMPLS scalability. We also discuss the Link Management Protocol which can be used to make the underlying links more manageable.