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. 30, 2007
Filed:
Dec. 05, 2002
Guy C. Fedorkow, Bedford, MA (US);
Gary S. Muntz, Lexington, MA (US);
Timothy P. Donahue, Natick, MA (US);
Michael E. Wildt, Somerville, MA (US);
Guy C. Fedorkow, Bedford, MA (US);
Gary S. Muntz, Lexington, MA (US);
Timothy P. Donahue, Natick, MA (US);
Michael E. Wildt, Somerville, MA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
In one embodiment, an intermediate node includes one or more active forwarding planes and one or more redundant forwarding planes. The intermediate node may also include one or more active control planes and one or more redundant control planes. A test packet is generated, in some cases by a redundant control plane, and transferred to a redundant forwarding plane. The operational state of the redundant forwarding plane is verified, at least in part, by using operational software and hardware contained in the redundant forwarding plane to forward the test packet from the redundant forwarding plane to a target line card. The target line card loops the test packet back to the redundant forwarding plane as part of the verification process. In some cases, the redundant control plane processes the looped-back test packet.