With the continuous acceleration of the urbanization process, the development of underground space around the rapid development, rail transit tunnel construction is increasingly perfect. In recent years, the construct...With the continuous acceleration of the urbanization process, the development of underground space around the rapid development, rail transit tunnel construction is increasingly perfect. In recent years, the construction of long and ultra-long distance tunnels is becoming more and more common, and the accuracy requirements are constantly improving. As one of the important difficulties affecting the penetration accuracy, the improvement of the tunnel underground plane control network accuracy is the key issue discussed in this paper. By introducing three methods to improve the accuracy and applying new technology to the long distance tunnel construction survey, combined with the project construction example, it is analyzed that the above three methods can improve the accuracy of the underground plane control network of long distance tunnel, meet the requirement of through-through control, and ensure the quality of the project.展开更多
In a translucent network scenario, development of an optical control plane (OCP) that is aware of the location and number of available regenerators and all-optical wavelength converters (AOWCs) is of paramount importa...In a translucent network scenario, development of an optical control plane (OCP) that is aware of the location and number of available regenerators and all-optical wavelength converters (AOWCs) is of paramount importance. However, current generalized multiprotocol label switching (GMPLS) protocol suite does not consider the distribution of regenerator and AOWC availability information to all the network nodes. In this paper, we propose a novel optical control plane (OCP) architecture that 1) disseminates information about network components (i.e. regenerators and AOWCs) to all the network nodes, and 2) evaluates candidate routes which use fewest amounts of network components. Performance of the proposed OCP is compared with a recently proposed hybrid OCP approach in terms of blocking performance, number of deployed components and lightpath establishment setup times. The obtained simulation results show that the proposed OCP approach demonstrates low connection blocking and establishes lightpaths by 1) minimizing the overall network cost owing to the deployment of minimum total number of network components, and 2) demonstrating acceptable lightpath establishment setup times at all traffic loads. Further, the proposed OCP methodology is compatible and suitable for controlling the operations of a novel electro-optical hybrid translucent node which is a latency efficient technology capable of delivering a cost effective implementation suitable for large scale deployment.展开更多
When applying Software-Defined Networks(SDN) to WANs,the SDN flexibility enables the cross-domain control to achieve a better control scalability.However,the control consistence is required by all the cross-domain ser...When applying Software-Defined Networks(SDN) to WANs,the SDN flexibility enables the cross-domain control to achieve a better control scalability.However,the control consistence is required by all the cross-domain services,to ensure the data plane configured in consensus for different domains.Such consistence process is complicated by potential failure and errors of WANs.In this paper,we propose a consistence layer to actively and passively snapshot the cross-domain control states,to reduce the complexities of service realizations.We implement the layer and evaluate performance in the PlanetLab testbed for the WAN emulation.The testbed conditions are extremely enlarged comparing to the real network.The results show its scalability,reliability and responsiveness in dealing with the control dynamics.In the normalized results,the active and passive snapshots are executed with the mean times of 1.873 s and 105 ms in135 controllers,indicating its readiness to be used in the real network.展开更多
The next-generation optical network is a service oriented network,which could be delivered by utilizing the generalized multiprotocol label switching(GMPLS) based control plane to realize lots of intelligent features ...The next-generation optical network is a service oriented network,which could be delivered by utilizing the generalized multiprotocol label switching(GMPLS) based control plane to realize lots of intelligent features such as rapid provisioning,automated protection and restoration(P&R),efficient resource allocation,and support for different quality of service(QoS) requirements.In this paper,we propose a novel stateful PCE-cloud(SPC)based architecture of GMPLS optical networks for cloud services.The cloud computing technologies(e.g.virtualization and parallel computing) are applied to the construction of SPC for improving the reliability and maximizing resource utilization.The functions of SPC and GMPLS based control plane are expanded according to the features of cloud services for different QoS requirements.The architecture and detailed description of the components of SPC are provided.Different potential cooperation relationships between public stateful PCE cloud(PSPC) and region stateful PCE cloud(RSPC) are investigated.Moreover,we present the policy-enabled and constraint-based routing scheme base on the cooperation of PSPC and RSPC.Simulation results for verifying the performance of routing and control plane reliability are analyzed.展开更多
G2MPLS is a Network Control Plane(NCP) architecture that implements the concept of Grid Network Services(GNS) required for implementing photonic Grids.It provides part of the functionalities related to the selection,c...G2MPLS is a Network Control Plane(NCP) architecture that implements the concept of Grid Network Services(GNS) required for implementing photonic Grids.It provides part of the functionalities related to the selection,co-allocation and maintenance of both Grid and network resources through a set of seamless procedures at the user-to-network and inter-domain boundaries.G2MPLS' main features and procedures are presented in this document,as well as the considerations to deploy it and facilitate its dissemination.展开更多
With the expansion of network services,large-scale networks have progressively become common.The network status changes rapidly in response to customer needs and configuration changes,so network configuration changes ...With the expansion of network services,large-scale networks have progressively become common.The network status changes rapidly in response to customer needs and configuration changes,so network configuration changes are also very frequent.However,no matter what changes,the network must ensure the correct conditions,such as isolating tenants from each other or guaranteeing essential services.Once changes occur,it is necessary to verify the after-changed network.Whereas,for the verification of large-scale network configuration changes,many current verifiers show poor efficiency.In order to solve the problem ofmultiple global verifications caused by frequent updates of local configurations in large networks,we present a fast configuration updates verification tool,FastCUV,for distributed control planes.FastCUV aims to enhance the efficiency of distributed control plane verification for medium and large networks while ensuring correctness.This paper presents a method to determine the network range affected by the configuration change.We present a flow model and graph structure to facilitate the design of verification algorithms and speed up verification.Our scheme verifies the network area affected by obtaining the change of the Forwarding Information Base(FIB)before and after.FastCUV supports rich network attributes,meanwhile,has high efficiency and correctness performance.After experimental verification and result analysis,our method outperforms the state-of-the-art method to a certain extent.展开更多
Space information network is used for real time acquiring, transmitting and processing the space information on the space platform, which provides significant communication services for communication, navigation posit...Space information network is used for real time acquiring, transmitting and processing the space information on the space platform, which provides significant communication services for communication, navigation positioning and science exploration. In this paper, the architecture of Software Defined Space Optical Network (SDSON) based on cloud platform is designed by means of Software Defined Optical Network (SDON) and cloud services. The new architecture combining centralized and distributed management-control mechanism is a multi-layer and multi-domain architecture with powerful computing and storage ability. Moreover, reliable service and unreliable service communication models employed in the space information network are proposed considering the characteristic of Disruption/Delay Tolerant Network (DTN). Finally, the functional verification and demonstration are performed on our optical experimental network platform.展开更多
随着工业互联网、车联网、远程医疗等新型服务的快速发展,多模态网络应运而生.该架构基于“技术体制与网络环境分离”的设计思想,使多种网络模态能够在同一基础平台上共生共存.然而,现有研究多集中于多模态网络的环境构建、编译优化与...随着工业互联网、车联网、远程医疗等新型服务的快速发展,多模态网络应运而生.该架构基于“技术体制与网络环境分离”的设计思想,使多种网络模态能够在同一基础平台上共生共存.然而,现有研究多集中于多模态网络的环境构建、编译优化与网元设计,缺乏对分布式控制平面负载均衡的系统研究.部分借鉴SDN(Software-Defined Networking)的交换机迁移与动态重分配机制虽可缓解控制器过载,但需在控制器间频繁同步状态信息,迁移开销大、响应延迟高,难以满足多模态网络的实时性与可扩展性要求.针对上述问题,本文通过对数据平面流量路由的合理规划,优化多模态网络中控制平面的负载分布,提出一种对多种网络模态的流量路由与多模态网元-控制器分配进行联合优化(Joint optimization of Routing and polymorphic network Element Controller Allocation,JRECA)方法.该方法将不同模态的控制信息规模差异显式纳入优化框架,综合考虑网元分配、路由选择、控制器处理能力与链路带宽等约束.对于多模态网络的异构特性,本文提出将不同模态控制信息规模差异纳入控制器负载约束的负载均衡机制,构建了同时实现控制平面负载均衡与数据平面吞吐量最大化的统一模型,实现控制平面负载与数据平面吞吐的协同优化,弥补既有研究中两平面割裂求解的不足,并进一步设计具有严格理论保证的“两步走”算法框架.首先,设计基于最大负载优先的多模态网元-控制器分配算法,确定多模态网元与控制器之间的匹配关系,并通过近似比证明严格界定了算法性能边界;然后,在动态流量环境下,设计基于原始-对偶方法的在线路由算法,并通过竞争比分析给出在线优化的理论性能下界.在Fat-Tree和ARPANet两种典型拓扑上的仿真实验表明,本文提出的算法在IPv4、IPv6、工控标识、命名数据标识和身份标识5种网络模态下均取得显著性能提升.与对比算法相比,本文提出的算法可降低17.56%~20.97%的控制器负载,并提高13.86%~29.82%的系统吞吐量.展开更多
自动电压控制(Automatic Voltage Control,AVC)系统通过调度数据网双平面接入调度系统主站,支撑区域电网电压/无功控制的安全与稳定运行。文章介绍了AVC系统基本原理,及接入调度数据网基本组成,对AVC子站接入新一代调度系统主站及接入...自动电压控制(Automatic Voltage Control,AVC)系统通过调度数据网双平面接入调度系统主站,支撑区域电网电压/无功控制的安全与稳定运行。文章介绍了AVC系统基本原理,及接入调度数据网基本组成,对AVC子站接入新一代调度系统主站及接入调度数据网双平面策略优化进行了研究,并在抽蓄电站对该策略AVC子站指令模式切换与双主模式切换进行了现场试验,对提升区域电网电压/无功控制能力,强化调度系统安全与稳定建设具有重要意义。展开更多
软件定义网络(Software Defined Network,SDN)在通信网络中的应用日益广泛,但其集中控制架构也带来新的安全挑战。文章深入剖析SDN架构下通信网络面临的安全威胁,包括控制器单点故障、拒绝服务攻击等,南向接口虚假流表注入、协议漏洞利...软件定义网络(Software Defined Network,SDN)在通信网络中的应用日益广泛,但其集中控制架构也带来新的安全挑战。文章深入剖析SDN架构下通信网络面临的安全威胁,包括控制器单点故障、拒绝服务攻击等,南向接口虚假流表注入、协议漏洞利用等,北向接口应用程序漏洞、身份认证问题等,以及数据平面流量劫持、分布式拒绝服务攻击等。提出相应的安全防御机制,为构建安全可靠的基于SDN的通信网络提供理论依据与实践指导。展开更多
文摘With the continuous acceleration of the urbanization process, the development of underground space around the rapid development, rail transit tunnel construction is increasingly perfect. In recent years, the construction of long and ultra-long distance tunnels is becoming more and more common, and the accuracy requirements are constantly improving. As one of the important difficulties affecting the penetration accuracy, the improvement of the tunnel underground plane control network accuracy is the key issue discussed in this paper. By introducing three methods to improve the accuracy and applying new technology to the long distance tunnel construction survey, combined with the project construction example, it is analyzed that the above three methods can improve the accuracy of the underground plane control network of long distance tunnel, meet the requirement of through-through control, and ensure the quality of the project.
文摘In a translucent network scenario, development of an optical control plane (OCP) that is aware of the location and number of available regenerators and all-optical wavelength converters (AOWCs) is of paramount importance. However, current generalized multiprotocol label switching (GMPLS) protocol suite does not consider the distribution of regenerator and AOWC availability information to all the network nodes. In this paper, we propose a novel optical control plane (OCP) architecture that 1) disseminates information about network components (i.e. regenerators and AOWCs) to all the network nodes, and 2) evaluates candidate routes which use fewest amounts of network components. Performance of the proposed OCP is compared with a recently proposed hybrid OCP approach in terms of blocking performance, number of deployed components and lightpath establishment setup times. The obtained simulation results show that the proposed OCP approach demonstrates low connection blocking and establishes lightpaths by 1) minimizing the overall network cost owing to the deployment of minimum total number of network components, and 2) demonstrating acceptable lightpath establishment setup times at all traffic loads. Further, the proposed OCP methodology is compatible and suitable for controlling the operations of a novel electro-optical hybrid translucent node which is a latency efficient technology capable of delivering a cost effective implementation suitable for large scale deployment.
基金supported by the National Basic Research Program of China (2012CB315903)the Program for Key Science and Technology Innovation Team of Zhejiang Province(2011R50010,2013TD20)+3 种基金the National High Technology Research Program of China(2015AA016103)the National Natural Science Foundation of China(61379118)the Research Fund of ZTE CorporationJiaxing Science and Technology Project (No.2014AY21021)
文摘When applying Software-Defined Networks(SDN) to WANs,the SDN flexibility enables the cross-domain control to achieve a better control scalability.However,the control consistence is required by all the cross-domain services,to ensure the data plane configured in consensus for different domains.Such consistence process is complicated by potential failure and errors of WANs.In this paper,we propose a consistence layer to actively and passively snapshot the cross-domain control states,to reduce the complexities of service realizations.We implement the layer and evaluate performance in the PlanetLab testbed for the WAN emulation.The testbed conditions are extremely enlarged comparing to the real network.The results show its scalability,reliability and responsiveness in dealing with the control dynamics.In the normalized results,the active and passive snapshots are executed with the mean times of 1.873 s and 105 ms in135 controllers,indicating its readiness to be used in the real network.
基金supported by National Natural Science Foundation of China(No.61571061)Innovative Research Fund of Beijing University of Posts and Telecommunications (2015RC16)
文摘The next-generation optical network is a service oriented network,which could be delivered by utilizing the generalized multiprotocol label switching(GMPLS) based control plane to realize lots of intelligent features such as rapid provisioning,automated protection and restoration(P&R),efficient resource allocation,and support for different quality of service(QoS) requirements.In this paper,we propose a novel stateful PCE-cloud(SPC)based architecture of GMPLS optical networks for cloud services.The cloud computing technologies(e.g.virtualization and parallel computing) are applied to the construction of SPC for improving the reliability and maximizing resource utilization.The functions of SPC and GMPLS based control plane are expanded according to the features of cloud services for different QoS requirements.The architecture and detailed description of the components of SPC are provided.Different potential cooperation relationships between public stateful PCE cloud(PSPC) and region stateful PCE cloud(RSPC) are investigated.Moreover,we present the policy-enabled and constraint-based routing scheme base on the cooperation of PSPC and RSPC.Simulation results for verifying the performance of routing and control plane reliability are analyzed.
文摘G2MPLS is a Network Control Plane(NCP) architecture that implements the concept of Grid Network Services(GNS) required for implementing photonic Grids.It provides part of the functionalities related to the selection,co-allocation and maintenance of both Grid and network resources through a set of seamless procedures at the user-to-network and inter-domain boundaries.G2MPLS' main features and procedures are presented in this document,as well as the considerations to deploy it and facilitate its dissemination.
基金supported by the Fundamental Research Funds for the Central Universities(2021RC239)the Postdoctoral Science Foundation of China(2021 M690338)+3 种基金theHainan Provincial Natural Science Foundation of China(620RC562,2019RC096,620RC560)the Scientific Research Setup Fund of Hainan University(KYQD(ZR)1877)the Program of Hainan Association for Science and Technology Plans to Youth R&D Innovation(QCXM201910)the National Natural Science Foundation of China(61802092,62162021).
文摘With the expansion of network services,large-scale networks have progressively become common.The network status changes rapidly in response to customer needs and configuration changes,so network configuration changes are also very frequent.However,no matter what changes,the network must ensure the correct conditions,such as isolating tenants from each other or guaranteeing essential services.Once changes occur,it is necessary to verify the after-changed network.Whereas,for the verification of large-scale network configuration changes,many current verifiers show poor efficiency.In order to solve the problem ofmultiple global verifications caused by frequent updates of local configurations in large networks,we present a fast configuration updates verification tool,FastCUV,for distributed control planes.FastCUV aims to enhance the efficiency of distributed control plane verification for medium and large networks while ensuring correctness.This paper presents a method to determine the network range affected by the configuration change.We present a flow model and graph structure to facilitate the design of verification algorithms and speed up verification.Our scheme verifies the network area affected by obtaining the change of the Forwarding Information Base(FIB)before and after.FastCUV supports rich network attributes,meanwhile,has high efficiency and correctness performance.After experimental verification and result analysis,our method outperforms the state-of-the-art method to a certain extent.
文摘Space information network is used for real time acquiring, transmitting and processing the space information on the space platform, which provides significant communication services for communication, navigation positioning and science exploration. In this paper, the architecture of Software Defined Space Optical Network (SDSON) based on cloud platform is designed by means of Software Defined Optical Network (SDON) and cloud services. The new architecture combining centralized and distributed management-control mechanism is a multi-layer and multi-domain architecture with powerful computing and storage ability. Moreover, reliable service and unreliable service communication models employed in the space information network are proposed considering the characteristic of Disruption/Delay Tolerant Network (DTN). Finally, the functional verification and demonstration are performed on our optical experimental network platform.
文摘随着工业互联网、车联网、远程医疗等新型服务的快速发展,多模态网络应运而生.该架构基于“技术体制与网络环境分离”的设计思想,使多种网络模态能够在同一基础平台上共生共存.然而,现有研究多集中于多模态网络的环境构建、编译优化与网元设计,缺乏对分布式控制平面负载均衡的系统研究.部分借鉴SDN(Software-Defined Networking)的交换机迁移与动态重分配机制虽可缓解控制器过载,但需在控制器间频繁同步状态信息,迁移开销大、响应延迟高,难以满足多模态网络的实时性与可扩展性要求.针对上述问题,本文通过对数据平面流量路由的合理规划,优化多模态网络中控制平面的负载分布,提出一种对多种网络模态的流量路由与多模态网元-控制器分配进行联合优化(Joint optimization of Routing and polymorphic network Element Controller Allocation,JRECA)方法.该方法将不同模态的控制信息规模差异显式纳入优化框架,综合考虑网元分配、路由选择、控制器处理能力与链路带宽等约束.对于多模态网络的异构特性,本文提出将不同模态控制信息规模差异纳入控制器负载约束的负载均衡机制,构建了同时实现控制平面负载均衡与数据平面吞吐量最大化的统一模型,实现控制平面负载与数据平面吞吐的协同优化,弥补既有研究中两平面割裂求解的不足,并进一步设计具有严格理论保证的“两步走”算法框架.首先,设计基于最大负载优先的多模态网元-控制器分配算法,确定多模态网元与控制器之间的匹配关系,并通过近似比证明严格界定了算法性能边界;然后,在动态流量环境下,设计基于原始-对偶方法的在线路由算法,并通过竞争比分析给出在线优化的理论性能下界.在Fat-Tree和ARPANet两种典型拓扑上的仿真实验表明,本文提出的算法在IPv4、IPv6、工控标识、命名数据标识和身份标识5种网络模态下均取得显著性能提升.与对比算法相比,本文提出的算法可降低17.56%~20.97%的控制器负载,并提高13.86%~29.82%的系统吞吐量.
文摘自动电压控制(Automatic Voltage Control,AVC)系统通过调度数据网双平面接入调度系统主站,支撑区域电网电压/无功控制的安全与稳定运行。文章介绍了AVC系统基本原理,及接入调度数据网基本组成,对AVC子站接入新一代调度系统主站及接入调度数据网双平面策略优化进行了研究,并在抽蓄电站对该策略AVC子站指令模式切换与双主模式切换进行了现场试验,对提升区域电网电压/无功控制能力,强化调度系统安全与稳定建设具有重要意义。
文摘软件定义网络(Software Defined Network,SDN)在通信网络中的应用日益广泛,但其集中控制架构也带来新的安全挑战。文章深入剖析SDN架构下通信网络面临的安全威胁,包括控制器单点故障、拒绝服务攻击等,南向接口虚假流表注入、协议漏洞利用等,北向接口应用程序漏洞、身份认证问题等,以及数据平面流量劫持、分布式拒绝服务攻击等。提出相应的安全防御机制,为构建安全可靠的基于SDN的通信网络提供理论依据与实践指导。
