A METHOD FOR PROTECTING THE SERVICE FLOW AND A NETWORK DEVICE

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(11)

EP 1 944 936 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	published in accordance with Art. 153(4) EPC

(15)	Correction information:
	Corrected version no 1 (W1 A1)

(48)	Corrigendum issued on:
	29.10.2008 Bulletin 2008/44

(43)	Date of publication:
	16.07.2008 Bulletin 2008/29

(21)	Application number: 06791133.9

(22)	Date of filing: 27.09.2006

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International Patent Classification (IPC):

H04L 29/04^(2006.01)

(86)	International application number:
	PCT/CN2006/002545

(87)	International publication number:
	WO 2007/051388 (10.05.2007 Gazette 2007/19)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

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Priority:

02.11.2005 CN 200510117499

(71)	Applicant: Huawei Technologies Co., Ltd.
	Bantian-Longgang District 518129 Shenzhen Guangdong (CN)

(72)	Inventor:
	HUANG, He 518129 Shenzhen Guangdong (CN)

(74)	Representative: Pfenning, Meinig & Partner GbR
	Patent- und Rechtsanwälte Theresienhöhe 13 80339 München 80339 München (DE)

(54)	A METHOD FOR PROTECTING THE SERVICE FLOW AND A NETWORK DEVICE

(57) A method for protecting the service flow is provided, wherein a back path is preset between the source node and the destination entity, the method includes steps: A, the source node switches the service flow to the backup path and transmits the service flow to the destination entity through the backup path, at the same time, the source node computes a hypo-excellent path by the route algorithm, and compares the hypo-excellent path with the backup path, if the hypo-excellent path is more excellent than the backup path, then implements the step B, if not, ends the program. B, the source node switches the service flow to the hypo-excellent path and transmits the service flow to the destination entity through the hypo-excellent path. A network device implementing the method for protecting the service flow is also provided. The method for protecting the service flow in the invention has the ability that the fast fault restoration.