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:
Jul. 09, 2013
Filed:
Sep. 23, 2010
Raj Tuplur, Fremont, CA (US);
Bharani Chadalavada, Santa Clara, CA (US);
Manoj Apte, San Jose, CA (US);
Rajagopalan Sivaramakrishnan, Campbell, CA (US);
Sriram Raghunathan, Cupertino, CA (US);
Umesh Krishnaswamy, San Jose, CA (US);
Raj Tuplur, Fremont, CA (US);
Bharani Chadalavada, Santa Clara, CA (US);
Manoj Apte, San Jose, CA (US);
Rajagopalan Sivaramakrishnan, Campbell, CA (US);
Sriram Raghunathan, Cupertino, CA (US);
Umesh Krishnaswamy, San Jose, CA (US);
Juniper Networks, Inc., Sunnyvale, CA (US);
Abstract
State information is synchronized between a plurality of routing engines in a multi-chassis router according to a synchronization gradient. An example multi-chassis router is described that includes a primary routing engine and a standby routing engine in each chassis. According to the synchronization gradient, the primary routing engine of a control node updates state information on the standby routing engine of the control node prior to updating the primary routing engines of the other chassis. The primary routing engines of the other chassis update state information in respective standby routing engines prior to updating state information in consumers. If a primary routing engine fails, the corresponding standby routing engine assumes control of the primary routing engine's duties. Upon assuming control, a standby routing engine resumes updating state information without having to resend state information or interrupt packet forwarding.