Generalized multiprotocol label switching, also referred to as multiprotocol 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 signaling and routing protocols. It has also triggered the development of new protocols such as the Link Management Protocol. In this article, we present the traffic engineering enhancements to the Open Shortest Path First Internet routing protocol  and IS
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