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:
Oct. 18, 2011
Filed:
May. 10, 2006
Sina Mirtorabi, Santa Clara, CA (US);
Mukhtiar Shaikh, San Jose, CA (US);
Abhay Kumar Roy, Santa Clara, CA (US);
Yousuf Hasan, Mountain View, CA (US);
Sina Mirtorabi, Santa Clara, CA (US);
Mukhtiar Shaikh, San Jose, CA (US);
Abhay Kumar Roy, Santa Clara, CA (US);
Yousuf Hasan, Mountain View, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A SONET network terminated by routers includes working paths and backup paths. The routers pre-establishes in their link state data bases the links in both for both the working and backup paths. However, the links involved in the backup paths are given higher costs, then the links working paths, that the routers select only the links in the working path. If there is a failure in a link in a working path, an APS arrangement provides rapid switchover of the optical links so as to substitute one or more links in the corresponding backup path. This is accomplished by changing the relative costs of the working and backup links involved, so that the routers select the backup links for their routing tables.