Method and system for detecting congestion and over subscription in a fibre channel network Number:7,522,529 from the United States Patent and Trademark Office (PTO) owispatent

Title: Method and system for detecting congestion and over subscription in a fibre channel network

Abstract: A method and system for detecting congestion and over-subscription in a fiber channel switch element is provided. A counter is updated if a frame cannot be transmitted due to lack of credit; then the counter value is compared to a threshold value; and an event is triggered if the counter value varies from the threshold value. Also, provided is a first register that maintains information regarding a rate at which a source port can transfer data; a counter that counts entries corresponding to a number of frames to be transmitted at a given time; and a second register that determines an over-subscription rate.

Patent Number: 7,522,529 Issued on 04/21/2009 to Dropps,   et al.

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Inventors:	Dropps; Frank R. (Maple Grove, MN), Ross; Edward C. (Edina, MN)
Assignee:	QLOGIC, Corporation (Aliso Viejo, CA)
Appl. No.:	10/895,175
Filed:	July 20, 2004

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Related U.S. Patent Documents

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	Application Number	Filing Date	Patent Number	Issue Date
	60503812	Sep., 2003
	60537933	Jan., 2004
	60488757	Jul., 2003
	60532965	Dec., 2003
	60504038	Sep., 2003
	60495212	Aug., 2003
	60495165	Aug., 2003
	60503809	Sep., 2003
	60505381	Sep., 2003
	60505195	Sep., 2003
	60557613	Mar., 2004
	60505075	Sep., 2003
	60504950	Sep., 2003
	60532967	Dec., 2003
	60532966	Dec., 2003
	60550250	Mar., 2004
	60569436	May., 2004
	60572197	May., 2004
	60532963	Dec., 2003

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Current U.S. Class:	370/237 ; 370/395.4
Current International Class:	H04L 12/26 (20060101)
Field of Search:	370/237,230.1,235,235.1,236,242-244,395.4,474

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