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:
Jun. 11, 2019
Filed:
Sep. 11, 2014
Applicant:
Fujitsu Limited, Kawasaki-shi Kanagawa, JP;
Inventors:
Stephen John Unger, Newfoundland, NJ (US);
Frank Schumeg, Sandyston, NJ (US);
Assignee:
FUJITSU LIMITED, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 12/46 (2006.01); H04L 12/741 (2013.01); H04L 12/823 (2013.01);
U.S. Cl.
CPC ...
H04L 47/32 (2013.01); H04L 12/462 (2013.01); H04L 12/4625 (2013.01); H04L 45/74 (2013.01); H04L 12/4641 (2013.01);
Abstract
A method and system for Ethernet loopback detection snoops an egress frame at a UNI-N edge device and records at least one source field of the egress frame, such as a MAC address or a VLAN tag. Ingress frames at the UNI-N edge device are monitored for having the same value in the source field as the egress frame. When an ingress frame has the same source field value as the egress frame, the ingress frame is identified as a loopback frame and is dropped at the UNI-N edge device.