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:
Sep. 24, 2002
Filed:
Apr. 19, 1999
Ofrit Lesser, Cupertino, CA (US);
Kenneth Moberg, Boulder Creek, CA (US);
William May, Sunnyvale, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
The present invention relates to providing processor redundancy in a system such as a router. According to an embodiment of the present invention, when a primary processor is about to crash in a system having two or more processors, the imminent crash is identified prior to the occurrence of the actual crash. The primary processor sends a message to the secondary processor to indicate that it is crashing. The primary also sets a timer to determine a period of time to wait prior to crashing. When the secondary processor receives the message from the primary processor, the secondary processor becomes the new primary processor. The new primary processor then sends an acknowledgement to the old primary processor. The old primary processor crashes and reboots as the new secondary processor.