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:
May. 22, 2012
Filed:
Dec. 15, 2009
Applicant:
Naomichi Nonaka, Kawasaki, JP;
Inventor:
Naomichi Nonaka, Kawasaki, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04L 12/28 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a L2VPN, where Ethernet frames are encapsulated and transferred, when an edge node disposed at an entrance of the L2VPN encapsulates an Ethernet frame, the data type of the payload of the Ethernet frame is checked. If the payload data type includes time-to-live (TTL) information, whether to encapsulate or discard the frame is judged according to the TTL value. One material for judging whether to discard the frame is a condition that the TTL value is larger than '1' and smaller than a predetermined threshold.