NNI

NNI is expanded two ways:

  1. network-to-network interface

    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.

  2. network node interface

    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.