A circumvention method of simple point reentrance of convertible wavelength intelligent optical network integrated routing

Abstract

The invention provides a method for avoiding the duplicate entrance of a single point in the joint routing of an intellective optical network with variant wavelength. In the method, an explicit joint routing is firstly computed aiming at business requirements; the method then determines whether the duplicate entrance situation of a single point exists in the explicit joint routing; if the duplicate entrance situation of a single point exists, the method inspects the resource status of the reentry point having the duplicate entrance situation and adopts a corresponding avoidance strategy according to the resource status; if the avoidance strategy has no effects, the method blocks the corresponding business requirement. The invention can lead the explicit routing in the IP layer business of the intellective optical network with variant wavelength not to enter a single network node for a plurality of times, thus reducing the probability of network node congestion, achieving the load balance of a whole network, and improving the network throughput.

Description

technical field [0001] The invention relates to a method for avoiding single-point re-entry problems in a joint routing mechanism, in particular to a method for calculating other candidate routes by using a heuristic avoidance method in a wavelength-convertible intelligent optical network, thereby effectively avoiding joint routing The method for the single-point re-entry problem in the mechanism belongs to the field of optical network technology. Background technique [0002] With the rapid development of the Internet, data services show a rapid growth trend, which puts forward high-quality, high-bandwidth requirements for network support technologies. In this context, because the wavelength division multiplexing technology makes each wavelength in the optical fiber a channel for carrying information transmission, the capacity of an optical fiber is composed of the total transmission capacity of multiple wavelengths, thus forming a huge transmission bandwidth, so it is call...

AI Technical Summary

Problems solved by technology

Because the connection of the lower layer is mapped as a direct link in the upper layer, the topology of the logical link of the IP layer and the physical link of the WDM layer are not consistent. In this way, a "loop" may be caused in the joint routing. For example, the routing of the IP layer is A-B-C, and the actual A-B connection is an optical path built through A-C-B at the WDM layer (signals on A and B have O-E-O photoelectric conversion, and C uses a resource reservation protocol to configure optical switches and other devices for transparent transmission without delay), while There is still an optical path B-C between B and C, but the optical path of A-C-B and B-C has not reached resource saturation. In order to improve resource utilization efficiency and reuse the established optical path as much as possible, the joint routing mechanism may choose A-C-B-C. way, so that there is a single point of reentry

Single-point re-entry that occurs in federated routing mechanisms can affect network resource utilization

This is because the packet switching port (PSC, Packet Switching Capable) and the wavelength switching port (LSC, Lambda Switching Capable) on each MPLS routing node are limited, and a single point overlap occurs in the explicit joint routing arranged for a service. The input will significantly affect the switching capability of MPLS routing nodes for other services, thereby affecting the throughput of the network

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