The Private Network to Network Interface is a routing protocol for ATM networks.  It enables the creation of private virtual circuits (PVC) over wide areas across any number of PNNI enabled ATM switches defining only the endpoints (edge devices) without defining the connections on the intermediate switches (inside the ATM cloud).  This protocol dynamically assigns and creates the circuit, allowing for routing around malfunctioning areas and better load distribution according to the requested bandwidth and Quality of Service (QoS).

Currently on version 1.0, PNNI is a standard protocol defined by the ATM Forum.

Source: OmniSwitch/OmniRouter User Manual, chapter 14 (Configuring and Monitoring PNNI).

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