Standby router protocol
Patent 5473599 Issued on December 5, 1995. Estimated Expiration Date: 
April 22, 2014. 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.
April 22, 2014. 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 ReferencesReliable local data network arrangement Method for controlling failover between redundant network interface modules Network system comprising a plurality of LANs using hierarchical routing Process for networking computers and/or computer networks and networking systems Patent #: 5218600 InventorsApplicationNo. 231330 filed on 04/22/1994US Classes:370/219, Standby switch370/402, Bridge between bus systems370/409, Employing logical addressing for routing (e.g., VP or VC)709/244, Centralized controlling714/4, Of network714/13Prepared backup processor (e.g., initializing cold backup) or updating backup processor (e.g., by checkpoint message)ExaminersPrimary: Olms, Douglas W.Assistant: Jung, Min Attorney, Agent or FirmInternational ClassH04J 003/14AbstractA system and protocol are provided for routing data packets from a host on a LAN through a virtual address belonging to a group of routers. The host is configured to point to the virtual address so that the packets it sends out of its LAN are always directed to a virtual router which may be any one of the group of routers. An active router in the group of routers emulates the virtual router. A standby router, also from the group of routers, backs up the active router so that if the active router becomes inoperative, the standby router automatically begins emulating the virtual router. The host router does not know which router from the group is actually handling the data packets it sends. If the standby router becomes inoperative or takes over for the active router, other routers in the group hold an election to determine which of them should take over for the standby router.Other References
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