A table containing all the attributes necessary to determine what the PNNI entity believes is reachable in terms of ATM End System Addresses and to determine which nodes are advertising this reachability. This table is also used to configure static routes to reachable address prefixes. The local node index that received the reachability information, reachable address, address prefix length, and an index that distinguishes between multiple listings of connectivity to a given address prefix from a given local node are combined to form an instance ID for this object.