Multiplex communications – Wide area network – Packet switching
Patent
1994-04-22
1995-12-05
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 8513, 39518202, 39518211, 39520015, H04J 314
Patent
active
054735998
ABSTRACT:
A 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.
REFERENCES:
patent: 4692918 (1987-09-01), Elliot et al.
patent: 5016244 (1991-05-01), Massey, Jr. et al.
patent: 5018133 (1991-05-01), Tsukakoshi et al.
patent: 5218600 (1993-06-01), Schenkyr et al.
Release notes for 3Com Corporation, "NETBuilder Family Bridge/Router", pp. 27-29, (Mar. 1994).
J. Moy, RFC 1247 "OSPF Version 2", Jul. 19, 1991.
D. Oran, RFC 1142 "OSI IS-IS Intra-domain Routing Protocol", Feb. 1990.
Black, Uyless, "TCP/IP and Related Protocols", McGraw-Hill, Inc., pp. 226-249, 1992.
Cole Bruce A.
Li Anthony J.
Cisco Systems Incorporated
Jung Min
Olms Douglas W.
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