Network-to-Network Interface

What Does Network-to-Network Interface Mean?

A network-to-network interface (NNI) is a physical interface that connects two or more networks and defines inter signaling and management processes. It enables the linking of networks using signaling, Internet Protocol (IP) or Asynchronous Transfer Mode (ATM) networks.


A network-to-network interface is also known as a network node interface (NNI).

Techopedia Explains Network-to-Network Interface

A NNI is used to provide the interconnection between two or more service providers or connecting service providers with an organizational network. It usually connects two or more P routers, which are used in Generalized Multiprotocol Label Switching (GMPLS) or signaling based networks. NNI can be implemented in several different modes and vary according to scenario. If using GMPLS, the connection can be created using a back-to-back and Exterior Border Gateway Protocol (EGBP) based NNI connection mode. NNI also provides linking services for full mixed and mesh network environments.


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Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…