PNNI is similar to the open shortest path first ( OSPF ) used for IP routing .
The Private Network - to - Network Interface ( PNNI ) is a link - state routing protocol used in Asynchronous Transfer Mode ( ATM ) networks .
PNNI is similar to the open shortest path first ( OSPF ) used for IP routing .
The Private Network - to - Network Interface ( PNNI ) is a link - state routing protocol used in Asynchronous Transfer Mode ( ATM ) networks .