Multi-failure protection method for multiple service levels in WDM network

Abstract

The invention relates to a protection method with a plurality of service grades for multiple faults in WDM networks, pertaining to the technical field of optical network communication. The method comprises the steps as follows: step one: connections of different grades are established for service requests arrived, that is, working accesses and accesses for protection are established; step two: for service connections conveying data in the networks, when failed links occur, the service grade is judged, different protection methods are executed to services of different grades, and enhanced recovery is executed to the service of the highest grade. The method of the invention meets the requirements for different protections raised by users in case of multilink faults in the WDM optical networks. EDSP takes into consideration of an enhanced recovery mechanism for load balancing, protection of resource sharing and resource recycling, so as to improve resource utilization rate and reduce blocking probability; effective multiple faults protection is also provided, and the requirement for services of diamond grade (highly reliable protection for multiple faults (three faults and more)), platinum grade (single fault being 100 percent protected) and economic grade (no protection) are met.

Description

technical field [0001] The invention belongs to the technical field of optical network communication, in particular to a multi-fault protection method for multiple service levels in a WDM network. Background technique [0002] In recent years, due to the explosive growth of Internet services, research on high-speed transmission networks has been triggered. Wavelength Division Multiplexing (WDM) technology can make full use of the huge bandwidth resources in the optical fiber, so it is widely used. Since the transmission rate of the wavelength channel in each optical fiber can be as high as gigabits, the failure of the optical fiber link will cause a large number of service interruptions, so the protection design of the WDM optical network must be carried out. Traditionally, for the failure of optical fiber links in WDM networks, single-link failures are considered as the main failure. However, with the gradual increase in the scale and complexity of WDM optical networks, th...

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Problems solved by technology

[0004] For the survivability of multiple levels of business, some studies have considered two levels, namely, single-fault level and double-fault level protection, and adopted a method of combining protection and recovery to provide survivability for the business. multiple fault protection problem

However, SPP also has defects, that is, it only allows the protection channels to share the same wavelength resources in the link and does not allow any working channel to share the same wavelength resources in the link with the protection channels corresponding to other working channels.

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