关键词: 虚拟网络映射, 节点扩展资源, 链路代价, 网络故障, 重映射

Abstract:

Aiming at the problem of link resource limitation and network survivability in virtual network mapping process, a node mapping scheme based on node extended resources and a virtual network remapping scheme are proposed respectively. In order to solve the problem of insufficient resources in the link mapping phase after node mapping, this article selects a physical node with a large node expansion resource as the bearer node to ensure the reliability and efficiency of the link mapping, and the link mapping phase adopts a mapping scheme based on the minimum link cost to obtain a highly reliable mapping. Based on this, a remapping strategy is adopted for network failure, and the failed nodes are quickly remapped to the candidate node set to ensure the continuity of the virtual network service. The performance of several algorithms are compared by simulation and the results show that the proposed algorithm achieves good results in virtual network mapping success rate, virtual network recovery success rate and resource load utilization.

Key words: virtual network mapping, node extension resources, link cost, network failure, remapping