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. 27, 2014
Filed:
Feb. 07, 2008
Marc Holness, Nepean, CA;
Donald Ellis, Ottawa, CA;
Nicola Benvenuti, Kanata, CA;
Ciena Corporation, Hanover, MD (US);
Abstract
Ethernet nodes, interconnected logically or physically to construct a closed loop, may be controlled using a control protocol that governs placement of blocks on the ring. The control protocol allows one of the nodes to be designated as a root node in normal operation. The root node will block data traffic on one of its ports on the ring to prevent a forwarding loop from being created on the ring. Each node on the ring performs link level connectivity detection and, upon detection of a failure, will send out a Failure Indication Message (FIM). When a node receives a FIM, it will flush its forwarding database associated with the ring and, if it is the root node, will remove the data block on the port. When the failure recovers, the nodes adjacent the failure will transmit a recovery indication message to allow the ring to revert to its normal state.