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:
Aug. 14, 2012
Filed:
Nov. 24, 2009
Kadangode K. Ramakrishnan, Berkeley Heights, NJ (US);
Rakesh Kumar Sinha, Edison, NJ (US);
Ajay Kumar Todimala, Silver Spring, MD (US);
Kadangode K. Ramakrishnan, Berkeley Heights, NJ (US);
Rakesh Kumar Sinha, Edison, NJ (US);
Ajay Kumar Todimala, Silver Spring, MD (US);
AT&T Intellectual Property I, L.P., Atlanta, GA (US);
Abstract
A second link in a network is reconfigured after failure of a first link, so that multiple-link failures may be survived. After receipt of an OSPF link state advertisement (LSA) indicating use of a backup path bafter the failure of link l, new backup paths are determined for each impacted link (x,y) that has a backup path sharing one or more links with the backup path b. The new backup paths are computed while ignoring the failed link l, the impacted link (x,y), and links common to the backup paths band b. The LSA protocol is modified to accommodate information used in determining whether a link is an impacted link.