A table containing all the attributes necessary to determine what transit networks the PNNI entity believes are reachable and to determine which nodes are advertising this reachability. This table is also used to add static routes to reachable transit networks. The local node index which received the reachability information, type of network identification, network identification plan, transit network identifier, and an index that distinguishes between multiple listings of connectivity to a given transit network from a given local node are combined to form an instance ID for this object.