Abstract
This paper discusses an extension to the PNNI augmented routing (PAR) protocol where PAR servers taking part in the Private Network to Network Interface (PNNI) protocol, and therefore aware of the PNNI topology, tag the PAR information delivered to the routers with topological metrics. These topological metrics reflect the location of the node that originated the PAR information. Routers can use this information to decide intelligently with which other routers to peer and establish adjacencies, thus optimizing the IP topology overlaying the ATM topology. Two optimization scenarios are described, one in the context of an enterprise network running OSPF, the other in the context of mobile networks running unicast RIP v2.0 to communicate among themselves.