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基于软件定义网络(SDN)的组播树在数据传输时,若链路出现故障,交换机需通过备份路径或通知控制器更新流表以恢复传输。但现有方法主要考虑减少恢复延迟和丢包,忽略流表项的资源消耗问题。因此,为尽可能平衡备份表项的资源开销和恢复路径的时间开销,提出基于链路权重的SDN组播链路故障恢复机制。针对两类不同链路提供相应的恢复策略,在保证可靠传输的基础上,考虑采用较少的备份流表项解决链路故障,恢复组播树数据的接收。仿真结果表明,该方案在备份流表项占比和路径恢复时间上有明显优势,在保证时延要求的同时,减少了资源消耗。 相似文献
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李路 《电子产品维修与制作》2010,(20):45-57
这类故障是在网络连接故障中所占比率也是相当高的,它涉及到物理链路和逻辑链路两种。物理链路是指网络布线系统所涵盖的建筑群子系统健筑物间布线)、垂直干线子系统(楼层间垂直布线)、水平配线子系统(同一楼层布线)和工作区子系统(办公室内部布线等)。 相似文献
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针对软件定义无人机网络(SUNET)链路状态频繁变化难以保障用户服务质量(Quality of Service, QoS)的问题,本文研究了软件定义UAV网络中包含流量管控与队列调度的自适应QoS机制。首先,利用SUNET能够获取全局链路状态信息的优势,提出一种自适应QoS流量控制机制,其综合考虑链路带宽、不同类别消息的优先级和到期时间(ToE)等QoS要求,自适应调整OpenFlow交换机的数据流表项与计量表;然后,结合Linux流量控制的优先级(PRIO)和分层令牌桶(HTB)算法设计出多级队列调度方案以实现细粒度控制。仿真结果表明,所提自适应QoS机制能够显著降低高优先级消息的传输时延与丢包率,满足不同类型消息的差异化要求。 相似文献
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针对软件定义网络(SDN)链路故障发生时的路由收敛问题,提出了Q-Learning子拓扑收敛技术(QL-STCT)实现软件定义网络链路故障时的路由智能收敛。首先,选取网络中的部分节点作为枢纽节点,依据枢纽节点进行枢纽域的划分。然后,以枢纽域为单位构建区域特征,利用特征提出强化学习智能体探索策略来加快强化学习收敛。最后,通过强化学习构建子拓扑网络用于规划备用路径,并保证在周期窗口内备用路径的性能。实验仿真结果表明,所提方法能够有效提高链路故障网络的收敛速度与性能。 相似文献
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Likun Wang Lin Yao Zichuan Xu Guowei Wu Mohammad S. Obaidat 《International Journal of Communication Systems》2018,31(10)
Software‐defined networking that separates the control plane from the data plane is envisioned as a promising technology to enable resilient and flexible network management. Tolerating link failures is a fundamental problem in enhancing such network resilience in software‐defined networking. Reactive and proactive fault tolerant schemes for conventional networks may not well balance the fault recovery time and network performance, since the proactive scheme typically underutilizes resources and the reactive scheme usually incurs a longer recovery time. In this paper, we propose a cooperative link failure recovery scheme to find a fine‐grained trade‐off between resource utilization and recovery time by combining reactive and proactive methods. We formalize the problem of link failure recovery as a multiobjective optimization problem and devise a 2‐stage algorithm for it. The first stage of the algorithm guarantees connectivity restoration in an acceptable recovery interval based on fast failover feature supported in OpenFlow protocol, meanwhile it assigns virtual local area network tags to back up paths for achieving a lower memory consumption. The second stage of the algorithm guarantees the quality of service for different applications by adjusting the backup paths after rapid connectivity restoration. Extensive simulations highlight that cooperative link failure recovery scheme can satisfy both the carrier‐grade recovery requirements and quality of service requirements in terms of delay and network bandwidth. 相似文献
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软件定义网络(Software Defined Network,SDN)是一种全新的网络架构,它的设计理念是将网络的控制平面与数据转发平面分离,并实现可编程化控制。Openflow由美国斯坦福大学于2007年提出,它提供了标准化的接口,采用流表控制方式,将传统网络通信设备的数据转发和路由控制功能分离,是实现SDN的关键技术。从技术内涵、设备模型等方面对SDN进行了深入研究,同时研究了电力数据通信网的实际需求和现存问题,最后对软件定义网络在电力数据通信网中的应用进行了讨论。 相似文献
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With the development of software-defined networking (SDN),its scalability has become one of the most important issues of SDN.The features of SDN was studied which lead to its scalability problem when SDN was applied to large-scale network.The three main causes leading to scalability problem were discussed:control plane and data plane separation,logical centralized control and fine-grained flow control.Meanwhile,the studies which focus on the scalability of SDN from three aspects:scalability of performance,scalability of geographic and scalability of control was presented.Further,the studies on the performance evaluation of the scalability of SDN were introduced.Finally,the future work was discussed. 相似文献
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软件定义网络(Software Defined Network,SDN)是一种全新的网络架构,它的设计理念是将网络的控制平面与数据转发平面分离,并实现可编程化控制.Openflow由美国斯坦福大学于2007年提出,它提供了标准化的接口,采用流表控制方式,将传统网络通信设备的数据转发和路由控制功能分离,是实现SDN的关键技术.从技术内涵、设备模型等方面对SDN进行了深入研究,同时研究了电力数据通信网的实际需求和现存问题,最后对软件定义网络在电力数据通信网中的应用进行了讨论. 相似文献
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IP packets back tracing is to find the source host hop by hop from the destination.The method found the forwarding path of target packets and source host by adding probe entry into flow tables on SDN switches and analyzing the effective back tracing Packet-in messages sent by related switches.The proposed scheme can provide convenience for debugging network problems ,so that the network administrator can obtain the forwarding paths of any data packets.Furthermore,it can help to solve the problem of IP spoofing.Experimental results prove that the traceability method can find the forwarding paths of target packets in a timely and accurate manner without affecting other traffic or significant system overhead. 相似文献
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随着移动通信技术的不断发展,5G网络的出现已经成为必然,而5G网络对于当前互联网和移动互联网技术的要求也在不断提升,在网络架构上倾向于采用软件定义网络进行架构,实现5G网络技术的应用.本文主要对基于软件定义网络的5G网络架构进行了分析探讨,以期能够为5G网络架构的实现打下基础. 相似文献
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天基信息网络的软件定义网络应用探析 总被引:1,自引:0,他引:1
现有各种空间、地面网络节点的互连互通,在一定程度上可满足特定应用需求,但由于各节点在空间、物理以及功能的局限,限制了天基信息高效传输、融合以及按需地应用。分析了天基信息网络的发展趋势,提出了网络架构构想,并对主要关键技术的研究方向进行了梳理。在空间核心节点上采用软件定义的多功能载荷平台,并基于软件定义网络( SDN)架构和空间容中断网络协议构建天基信息网络。通过资源虚拟化、处理多元化、应用无阻化的方式,保障天基信息网络适应信息按需定制和高效共享等应用需求。 相似文献