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Metro Ethernet by Sam Halabi

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N
Network Management System (NMS).

System responsible for managing at least part of a network. An NMS is generally a reasonably powerful and well-equipped computer, such as an engineering workstation. NMSs communicate with agents to help keep track of network statistics and resources.

Network-to-Network Interface (NNI).

A specification of the interface between a backbone system and another backbone system. For example, the specification of an optical interface that connects two optical switches in the carrier network.

Notify message.

A message used by RSVP-TE to notify other nodes of certain failures.

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