Multiple protocol routing
Patent 5251205 Issued on October 5, 1993. Estimated Expiration Date: 
October 5, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 5, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and apparatus for bridging local area networks Controller for controlling multiple LAN types Method and apparatus for linking SNA terminals to an SNA host over a packet switched communications network Network system comprising a plurality of LANs using hierarchical routing Node device Patent #: 5031174 InventorsAssigneeApplicationNo. 577437 filed on 09/04/1990US Classes:370/392Processing of address header for routing, per seExaminersPrimary: Olms, Douglas W.Assistant: Jung, Min Attorney, Agent or FirmInternational ClassesH04J 003/26H04L 012/56 AbstractA method for connecting a network so that TCP/IP and OSI 8473 packets may be routed in the same domain. The independence of the addresses is maintained: one device in the network may be assigned only a TCP/IP address, and another device may be assigned only a ISO 8473 address. Furthermore, all of the routers share link state information by using a common link state packet format (such as the ISO 10589 format); thus routes through the network may be computed without regard for the protocols supported by the routers along the route. Where necessary, packets are encapsulated and forwarded through routers which are not capable in the protocol of the packet. In some disclosed embodiments, all of the routers in a given area support a given protocol (or, in fact, have identical capabilities, in which case encapsulation is not required). In these embodiments, the encapsulation is performed by suitable modifications to each router's packet forwarding procedures. In other disclosed embodiments, these topological restrictions are removed, and the network is expanded to support additional protocols. In these embodiments, the Dijkstra algorithm is also modified to generate information on how to encapsulate and forward packets through the network.Other References
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