The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 2009
Filed:
May. 20, 2002
Ian Herbert Wilson, Midlothian, GB;
Ian Herbert Wilson, Midlothian, GB;
Cisco Technology, Inc., San Jose, CA (US);
Abstract
Redundant gateway methods, apparatus and systems use more than one gateway device in a gateway device group for communications directed outside of a LAN. Failover services in the event that an active router or other gateway device fails. In determining the priority of members of the group to become the active router/device for the group, a route metric is used as the priority value in elections held to determine the operating mode of each group member. This route metric is a numerical value representing the optimality of a route available between the router and a destination such as a remote network. By comparing the members' respective route metrics from time to time and in the event of a trigger event, the active router/device in a group is guaranteed to be the router with the optimal route to that remote network.