Network management platform based on mobile agents

Many of the modern network management solutions are based on commercially available management platforms. These platforms offer common management services, such as support for multiple‐management protocols, alarm management, and event correlation. Most of these platforms are based on the traditional manager—agent model adopted in standard protocols, such as Internet SNMP. However, these platforms suffer from limitations imposed by the centralized, static, polling‐based management model of SNMP, and the need for maintaining a central intelligence at the platform level. In view of the dynamic nature of evolving networks, future network management solutions need to be flexible, adaptable, and intelligent without increasing the burden on network resources. We have addressed this requirement with a new management platform architecture based on ontology‐driven mobile agents. This paper presents the new management platform architecture, its prototype implementation, and the results of its evaluation. Copyright © 2004 John Wiley & Sons, Ltd.     

The Research on Handoff Strategy in Beyond 3G Wireless Networks

1Introduction TheBeyondThirdGenerationMobileSystems(B3G)isabrandnewmobilitycommunicationsystembasedon IPv6corenetwork.B3Gcanprovidevariousservices withtheendtoendQoSguaranteeflexible,andthe transferdatarate150Mb/s.Itspeakratecanreach30～50Mb/sinlargecover…     

基于策略的分布式网络故障管理设计

针对传统网络故障管理在功能和性能上存在的不足,提出了一种基于策略和移动代理的网络故障管理方法,该方法能实时监测网络的运行情况,及时了解网络运行的性能状态,根据预定的策略进行相应的分析处理,大大减轻管理员的操作负担,实现一定的智能化管理。论述了基于策略和移动代理的性能管理软件系统的设计和工作原理。通过故障管理软件在检测到链路误码率增大时,采用策略和移动代理进行自动化和智能化控制的实例,验证了基于策略和移动代理的智能化故障管理。     

Programmable virtual network instantiation in IaaS cloud based on SDN

A possible approach to cope with the diversity of future networks is to set up multiple isolated virtual networks on top of a single shared physical substrate, and each virtual network is customized to some specific purposes. However, in the current realization of virtualized infrastructure, the OpenStack infrastructure as a service (IaaS) cloud, whose isolation and programmability are limited in terms of scalability and performance. To overcome these limitations, we propose a solution based on software defined networking (SDN) which is composed of a centralized server and distributed agents. The server has complete view of the whole network substrate, and is responsible for the installation and management of virtual network through the distributed agents. Each agent has the local view of the substrate node. They can manage the local resources, dispatch and filter the inner- programmable virtual network (PVN) traffic based on MAC isolation which is more scalable than virtual local area network (VLAN) and more efficient than GRE. Our prototype implementation shows that this architecture is feasible and provides a better compromise between flexibility and performance than the solo centralized and distributed solutions.     

云监控系统在网络集中管理中的应用研究

分析了集中化网络运维发展趋势,阐述了集中网络监控、集中投诉处理、集中性能分析的三集中趋势下网络运维面临的困难,提出利用最前沿的虚拟化三层架构实现集中化网络运维云监控解决方案,打造移动集中化网络运维云监控中心;同时,基于集中化网络运维云监控支撑系统构建新型的网络运维云管理模式,打造网络运维集中化趋势下的技术力量及信息的共享资源池,最终实现在技术、信息、人才共享基础之上的三集中网络运维管理体系,实现网络运维模式的跨越式转型发展。     

Design and Implementation of Dynamic High-Speed Switches in Super Base Station Architectures

Novel centralized base station architectures integrating computation and communication functionalities have become important for the development of future mobile communication networks.Therefore,the development of dynamic high-speed interconnections between baseband units(BBUs)and remote radio heads(RRHs)is vital in centralized base station design.Herein,dynamic high-speed switches(HSSs)connecting BBUs and RRHs were designed for a centralized base station architecture.We analyzed the characteristics of actual traffic and introduced a switch traffic model suitable for the super base station architecture.Then,we proposed a data-priority-aware(DPA)scheduling algorithm based on the traffic model.Lastly,we developed the dynamic HSS model based on the OPNET platform and the prototype based on FPGA.Our results show that the DPA achieves close to 100%throughput with lower latency and provides better run-time complexity than iOCF and HE-iSLIP,thereby demonstrating that the proposed switch system can be adopted in centralized base station architectures.     

Dynamic control plane management for software‐defined networks

Software‐defined network (SDN) is an emerging network paradigm that allows flexible network management by providing programmability from a separated control plane. Because of the centralized management scheme that SDN adopts, intensive control plane overhead incurs as the scale of SDN increases. The control plane overhead is mainly caused by a massive amount of control messages generated during data plane monitoring and reactive flow instantiation. By far, very few works have addressed the overhead issue on reaction flow instantiation; therefore, we mainly focus on alleviating such overhead in this work. To achieve this goal, we propose a new control plane management (CPMan) method. CPMan aims to realize the following two objectives: first, reduce the number of control messages exchanged through the control channel and second, evenly distribute the control workload across multiple controllers to mitigate the potential performance bottleneck. To realize the former, we propose a lightweight feedback loop‐based control scheme, whereas for the latter, we propose a dynamic switch‐to‐controller (DSC) placement scheme. To show the feasibility of our proposal, we implemented a prototype of the two proposed schemes on top of a carrier‐grade SDN controller and validated its performance in an emulated network. We achieved approximately 57.13% overhead reduction with feedback loop‐based control scheme, while achieved approximately 98.68% balance ratio with DSC placement scheme. Copyright © 2016 John Wiley & Sons, Ltd.     

ESLD: An efficient and secure link discovery scheme for software‐defined networking

Software‐defined networking simplifies network management by decoupling the control plane from the data plane and centralizing it to the controller. As the brain of the network, the controller gains up‐to‐date holistic network visibility via topology discovery. However, as a key service of topology discovery, the link discovery service opens problems on efficiency and security. On the one hand, sending link discovery packets to all ports wastes not only the limited controller resources (such as CPU and memory) but also control channel bandwidth. On the other hand, attackers may use these packets to create fake links and perform link fabrication attack. Because of the centralized control paradigm, wasting controller resources may degrade network performance, and all the fake links may severely poison the network topology, even causing the denial of service or man‐in‐the‐middle attack. In this paper, we propose an efficient and secure link discovery scheme to improve link discovery performance and resist link fabrication attack caused by the software‐defined networking link discovery service. By adopting port classification technique and directionally transmitting packets to appropriate ports, our approach can reduce or eliminate redundant packets and improve link discovery performance. Meanwhile, we adopt the directional packet transmitting approach and the time‐marked hash‐based message authentication code authenticate scheme to resist the link fabrication attack. A prototype system is implemented on the basis of POX controller and Mininet simulator to evaluate our scheme. Simulation results demonstrate that our scheme can solve the link fabrication problems with less overload of both the control plane and the data plane.     

A Software Radio Implementation of Centralized MAC Protocol for Cognitive Radio Networks

In the past decade the cognitive radio paradigm has received great attention from academia and industry as a promising approach to solve the spectrum shortage problem. In spite of the intense research activity in the field of cognitive radio, we still register a limited number of network implementations based upon the cognitive radio principles. In this work we present the design and implementation of a proprietary medium access control protocol that we have conjectured using ECMA-392 standard as reference. In the proposed design, the network uses an out-of-band cognitive control channel (CCC) for network management operations. The main contributions of this paper are: (1) a working prototype of a centralized cognitive network implemented in the platform provided by the universal software radio peripheral and GNU Radio software; (2) the presentation of significant data acquired during the field test of our prototype such as average network reconfiguration delay when the CCC is jammed by the primary user and the capability of the cognitive network to reconstruct channel occupancy/vacancy by means of distributed spectrum sensing. The prototype has been designed to operate in the 375–445 MHz frequency bands for a potential application in public safety ad-hoc networks.     

DL-assisted programmable multilayer network application awareness system for IP-over-EON

In order to realize real-time and fine-granularity network monitoring and adjustment,and satisfy the specific QoS demands of various applications,a deep learning (DL) assisted programmable multilayer network application performance awareness system for IP-over-EON was proposed.The distributed network monitoring based on network application performance awareness was combined with centralized network management.The multilayer and fine-grained network monitoring was implemented by distributed network monitoring,and the data analysis through DL was performed.Experimental results indicate that by combining distributed and centralized processing seamlessly,the proposed network monitoring system can not only realize timely and automatic network control and management but also provide superior scalability.     

基于多移动代理的网络性能管理系统

基于移动代理的网络性能管理,利用移动代理的移动性、智能性、灵活性和强大的扩展能力,通过对整个网络进行本地和全局的性能监控和性能数据采集,提供实时数据采集、分析和可视化工具,最终为管理员完成可视化的性能报告。能够对网络实施高效、实时和准确的性能管理,而且移动代理的平台无关性又可方便地实现跨平台的网络管理,在复杂网络的管理方面有着极大的优势。根据多移动代理的设计模式,借助于UML建模工具构建了一个性能管理系统,清晰地描述了该系统的静态和动态结构,克服了传统的集中式网络性能管理的诸多缺点。     

Research and Design of Network Management Construction Based on Mobile AGENT

The technical characters of mobile agent （MA） originated in the distributional artificial intelligence domain is introduced. A network management construction based on agent （NMCA） is then proposed. The NMCA structure features are elaborated in detail. A prototype design of NMCA is given by using the jKQML programming. The establishment of NMCA platform will be helpful to reduce the correspondence load of network management and improves the efficiency and the expansion ability of network management systems.     

分布式应用安全策略集中化管理实现方法

随着通信网络建设规模的加大,分布式应用系统关联程度也日益加深。如何通过安全策略管理,提高系统安全整体管理能力是信息安全建设中的重要任务之一。本文提出了一种分布式安全策略集中化管理的实现方法,从体系框架、系统架构、实施方法等方面进行了详细的阐述。将原本分散在各领域的网络和信息安全策略进行集中化管理,进一步发挥集中化管理效率的优势,满足当前分布式应用环境对信息安全整体性、协同性的需求。     

基于网管应用的移动代理和CORBA性能比较研究

对基于移动代理和CORBA的网管应用分别建立了数学模型和原型系统,对两种分布式技术在网管应用中的性能进行了比较分析。仿真结果表明两种技术的性能比较应综合考虑多种因素。此外,利用移动代理可以实现更为灵活的网络管理机制。     

Design and demonstration of policy-based management in a multi-hop ad hoc network

In this paper, we propose a policy-based framework for the management of wireless ad hoc networks and briefly describe a characteristics-based taxonomy that provides a platform to analyze and compare different architectural choices. We develop a solution suite that helps achieve our goal of a self-organizing, robust and efficient management system. One of the main contributions of this work is the prototype implementation and testing of the mechanisms and protocols comprising our framework in a multi-hop ad hoc network environment. Experiments are conducted using both an emulated ad hoc network testbed and a true wireless testbed. Degradation in management system performance is observed as the number of hops between a policy server and client increases. Our proposed k-hop clustering algorithm alleviates this problem by limiting the number of hops between a server and client. We demonstrate the operation of our prototype implementation, illustrating QoS management in a multi-domain ad hoc network environment using the proposed cluster management, redirection, and policy negotiation mechanisms.     

A hierarchical multilayer QoS routing system with dynamic SLAmanagement

This paper proposes a hierarchical multilayer QoS routing system with dynamic SLA management for large-scale IP networks. Previously, the promising approach to provide QoS in large-scale IP networks using a mixture of DiffServ-based QoS management and MPLS-based traffic engineering has been actively discussed. However, the introduction of QoS exacerbates the already existing scalability problems of the standard IP routing protocols. In order to address this issue, we propose a new scalable routing framework based on hierarchical QoS-aware path computation. We augment the existing OSPF and CR-LDP protocols to support hierarchical QoS routing, QoS aggregation, and QoS reservation in our MPLS-DiffServ-based hierarchical routing network. In order to provide additional flexibility and cost-efficiency, we augment the network with a policy server which is capable of dynamically handling SLAs between the networks and providing load balancing management within the network. We implement a prototype of the proposed framework and study its performance with a virtual network simulator and specially designed QoS routing algorithm simulator. In our simulations, we evaluate both the implementation complexity and algorithms performance; the results demonstrate the efficiency of the framework and its advantages over the existing proposals     

Web Services‐based network management: approaches and the WSNET system

While the Simple Network Management Protocol (SNMP) is still the dominant protocol for managing network elements in IP‐based networks and the Internet, network managers are acknowledging its limitations with respect to configuration management, application development and decentralization of management tasks. Web Services (WS) have been recently proposed to alleviate these limitations, given their pertinence to both decentralized management paradigms (e.g., CORBA), and XML management systems which provide efficiency in configuration management operations. This paper reviews architectures for WS‐based network management, outlining their advantages and disadvantages. These architectures address management of both individual network elements and composite multi‐device networks. Moreover, the paper introduces the architecture of a prototype system for WS‐based network management, namely WSNET. Along with presentation of the WSNET system, we provide a set of experimental results reporting performance figures for the WSNET system, as well as for systems based on other WS architectures. These figures allow for a comparative evaluation of the various systems, and manifest the benefits of the WSNET implementation. An important conclusion from our work is that WS should be seen as an accompaniment to conventional SNMP management rather than a replacement. However, there are also cases (e.g., need for secure remote access) where WS serve as a core rather than auxiliary solution, given that conventional methods are not applicable. Copyright © 2006 John Wiley & Sons, Ltd.     

基于无线传感网络的手机实时医疗监护系统简

针对通过住院观察病人的心电图来对心血管疾病进行诊断的方法的不足,文中采用无线传感网络作为监控系统的信息采集平台,将其应用于人体健康监控领域,设计并实现了一款基于无线传感网络的手机实时医疗监护系统。系统通过无线传感网络来对患者的心电数据进行集中式管理．并可通过医生工作站来实现对患者的远程病情诊断。与目前现有的远程医疗监护系统相比,基于无线佳感网络的手机实时医疗监护系统具有精确度高、实时性好、能耗低、部署方便、设备廉价等一系列优势。     

GMPLS网络的近实时拓扑监视服务的性能

提出了一种基于CORBA的网络管理系统模型和一种适用于GMPLS网络的准实时拓扑监视方案。根据LMP的MIB表得到初始化的拓扑信息,并通过分析SNMP的traps更新其拓扑信息。通过检测所提模型的延迟,证明文中所提出的拓扑监视方案可以实现准实时的要求。     

分布式计算机基础实验机房管理系统设计

传统的集中式实验机房计费管理模式已不能适应多个分散机房的管理需求,为了解决跨区域机房的计费问题,系统采用分布式解决方案,依据功能需求采用C／S与B／S结合的系统模型,可实现数据集成和区域管理。运行结果表明,系统的各项功能符合要求,能适用于广域网,实现跨校区管理。