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. 06, 2005
Filed:
Mar. 07, 2002
Thirumalpathy Balakrishnan, Santa Clara, CA (US);
Ajay Gaonkar, Sunnyvale, CA (US);
Eddy NG, Los Altos, CA (US);
Thirumalpathy Balakrishnan, Santa Clara, CA (US);
Ajay Gaonkar, Sunnyvale, CA (US);
Eddy Ng, Los Altos, CA (US);
Riverstone Networks, Inc., Santa Clara, CA (US);
Abstract
Multiple techniques for providing failure protection in a network node that includes primary and secondary control modules (CMs) are disclosed. One technique involves synchronizing configuration state information between the CMs by executing a configuration command within the primary CM and then executing the same configuration command within the secondary CM only if executing the configuration command within the primary CM does not cause the primary CM to fail. Another technique involves gleaning table entries from hardware-based forwarding tables and using the gleaned table entries to generate a software-based forwarding table in the secondary CM. Another technique involves maintaining existing table entries in hardware-based forwarding tables after a switchover, generating orphan table entry links at the secondary CM to the existing table entries in the hardware-based forwarding tables, and then using the links to manage the existing table entries until the secondary CM can re-program the hardware-based forwarding tables.