NNI
NNI is expanded two ways:
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An NNI is a standard interface between two ATM devices or two frame relay devices.
An NNI is also a port that resides on a PE bridge or a transit bridge, and connects to a service provider network.
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NNI is the interface between two ATM network devices that operate under different administrative domains, such as a vendor ATM switch and an ATM switch from another vendor.