Virtual network mapping method under SDN-oriented elastic optical network

Abstract

The invention provides a virtual network mapping method of an elastic optical network facing an SDN, and mainly solves the problem in the elastic optical network facing the SDN that a network virtualization mode is utilized to realize flexible distribution and scheduling of network resources. The method specifically comprises the steps of: 1, obtaining underlying networking information; 2, receiving virtual network request information; 3, obtaining an alternative programmable physical node set; 4, mapping virtual network nodes; 5, judging whether all virtual node of the current virtual network have been mapped into a physical network; and 6, carrying out virtual network link mapping. According to the invention, the virtual node mapping method based on distance and comprehensive resource sensing, a breadth-first search method and an improved shortest path algorithm based on available space closest matching are utilized, the blocking probability of virtual network mapping is lowered, the bandwidth resource consumption of the physical network is reduced, and the future virtual network business bearing capability of the network is improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a virtual network mapping method under an SDN-oriented elastic optical network in the technical field of wired communication. The present invention can be applied in the SDN-oriented elastic optical network to realize flexible allocation and scheduling of network resources through network virtualization. Background technique [0002] With the rapid development of mobile communication technology, data centers, and cloud computing, the demand for bandwidth shows an explosive growth trend. Ultra-large-capacity, dynamic and flexible all-optical networks will become an inevitable trend in future network development. SDN (Software Defined Network) flexibly configures and schedules network resources through network resource virtualization and hardware module programmable features to maximize network resource utilization. However, the fixed bandwidth allocation adopted by t...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the relative distance between the candidate programmable physical nodes is not considered in the node mapping stage, and only the shortest path between the selected physical programmable nodes is considered in the link mapping, so it is very useful. It may cause the selected physical programmable nodes to be too scattered, thus consuming a large amount of bandwidth resources; at the same time, the resource usage of the link is not considered in the link mapping, so it is very likely that when the virtual network arrives in the future, due to serious spectrum fragmentation This leads to a high virtual network mapping blocking rate and a poor network capacity to carry future virtual network services.

The disadvantage of this method is that this method only considers the resources of nodes in the process of node mapping, and does not take into account the bandwidth requirements and the use of link resources in the link mapping stage, resulting in the quality of link mapping being very different. Much depends on the result of node mapping, virtual network mapping has a high blocking rate

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