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. 12, 2014
Filed:
Sep. 28, 2011
Hui Qu, Santa Clara, CA (US);
Mu Lin, Sunnyvale, CA (US);
Shine-chu Wang, Sunnyvale, CA (US);
Heng-hui Debbie Chu, Palo Alto, CA (US);
Leyi Zhang, Cupertino, CA (US);
Zi Zhou, Sunnyvale, CA (US);
Joel Obstfeld, Bushey Herts, GB;
Hui Qu, Santa Clara, CA (US);
Mu Lin, Sunnyvale, CA (US);
Shine-Chu Wang, Sunnyvale, CA (US);
Heng-Hui Debbie Chu, Palo Alto, CA (US);
Leyi Zhang, Cupertino, CA (US);
Zi Zhou, Sunnyvale, CA (US);
Joel Obstfeld, Bushey Herts, GB;
Juniper Networks, Inc., Sunnyvale, CA (US);
Abstract
Techniques are described for providing high availability for a network device, e.g., a router, using full memory replication between a primary virtual machine (VM) and a standby VM running on the network device. In one example, the techniques provide hot-standby high availability for a router by initializing a primary VM and a standby VM on the router at the same time. In another example, the techniques provide high availability for the router by initializing a standby VM on the router upon detecting a failure of the primary VM. In both examples, the primary VM controls the routing functionality and periodically stores a full memory state. Upon a failure of the primary VM, a hypervisor may perform a full memory replication between the primary VM and the standby VM. The standby VM may then take control of the routing functionality at the last stored state of the memory.