可编程性恢复是软件定义广域网(Software Defined Wide Area Network, SD-WAN)中节点失效后保障网络服务质量的有效方法 .针对可编程性恢复中失效节点形式单一的问题,提出一种基于启发式算法的主备份控制器部署方法来确保交换机和控制...可编程性恢复是软件定义广域网(Software Defined Wide Area Network, SD-WAN)中节点失效后保障网络服务质量的有效方法 .针对可编程性恢复中失效节点形式单一的问题,提出一种基于启发式算法的主备份控制器部署方法来确保交换机和控制器失效时网络的可编程性.在主控制器部署时,利用控制路径密度和强度衡量域内控制路径的可靠性,提升交换机故障情况下的路径可编程性;在备份控制器部署时,将一定数量的、相邻的主控制域划分为多个备份区域,在备份区域中部署一个备份控制器,建立它与交换机的映射策略,使脱机交换机以及离线流的恢复能力最大化,以提升控制器故障情况下的离线流的可编程性.此外,重新定义狼群算法的智能行为,提出一种离散狼群算法解决主备控制器的部署问题.在四种真实网络拓扑上进行实验,结果表明提出的方法在交换机故障的情况下能降低失效控制路径的影响,在控制器故障时能最大程度上恢复离线流.展开更多
The future Wireless Cloud Networks (WCNs) are required to satisfy both extremely high levels of service resilience and security assurance (i.e., Blue criteria) by overproviding backup network resources and cryptograph...The future Wireless Cloud Networks (WCNs) are required to satisfy both extremely high levels of service resilience and security assurance (i.e., Blue criteria) by overproviding backup network resources and cryptographic protection on wireless communication respectively, as well as minimizing energy consumption (i.e., Green criteria) by switching off unnecessary resources as much as possible. There is a contradiction to satisfy both Blue and Green design criteria simultaneously. In this paper, we propose a new BlueGreen topological control scheme to leverage the wireless link connectivity for WCNs using an adaptive encryption key allocation mechanism, named as Shared Backup Path Keys (SBPK). The BlueGreen SBPK can take into account the network dependable requirements such as service resilience, security assurance and energy efficiency as a whole, so as trading off between them to find an optimal solution. Actually, this challenging problem can be modeled as a global optimization problem, where the network working and backup elements such as nodes, links, encryption keys and their energy consumption are considered as a resource, and their utilization should be minimized. The case studies confirm that there is a trade-off optimal solution between the capacity efficiency and energy efficiency to achieve the dependable WCNs.展开更多
文摘可编程性恢复是软件定义广域网(Software Defined Wide Area Network, SD-WAN)中节点失效后保障网络服务质量的有效方法 .针对可编程性恢复中失效节点形式单一的问题,提出一种基于启发式算法的主备份控制器部署方法来确保交换机和控制器失效时网络的可编程性.在主控制器部署时,利用控制路径密度和强度衡量域内控制路径的可靠性,提升交换机故障情况下的路径可编程性;在备份控制器部署时,将一定数量的、相邻的主控制域划分为多个备份区域,在备份区域中部署一个备份控制器,建立它与交换机的映射策略,使脱机交换机以及离线流的恢复能力最大化,以提升控制器故障情况下的离线流的可编程性.此外,重新定义狼群算法的智能行为,提出一种离散狼群算法解决主备控制器的部署问题.在四种真实网络拓扑上进行实验,结果表明提出的方法在交换机故障的情况下能降低失效控制路径的影响,在控制器故障时能最大程度上恢复离线流.
文摘The future Wireless Cloud Networks (WCNs) are required to satisfy both extremely high levels of service resilience and security assurance (i.e., Blue criteria) by overproviding backup network resources and cryptographic protection on wireless communication respectively, as well as minimizing energy consumption (i.e., Green criteria) by switching off unnecessary resources as much as possible. There is a contradiction to satisfy both Blue and Green design criteria simultaneously. In this paper, we propose a new BlueGreen topological control scheme to leverage the wireless link connectivity for WCNs using an adaptive encryption key allocation mechanism, named as Shared Backup Path Keys (SBPK). The BlueGreen SBPK can take into account the network dependable requirements such as service resilience, security assurance and energy efficiency as a whole, so as trading off between them to find an optimal solution. Actually, this challenging problem can be modeled as a global optimization problem, where the network working and backup elements such as nodes, links, encryption keys and their energy consumption are considered as a resource, and their utilization should be minimized. The case studies confirm that there is a trade-off optimal solution between the capacity efficiency and energy efficiency to achieve the dependable WCNs.
