XML‐Based Network Management for IP Networks

XML‐based network management, which applies XML technologies to network management, has been proposed as an alternative to existing network management. The use of XML in network management offers many advantages. However, most existing network devices are already embedded with simple network management protocol (SNMP) agents and managed by SNMP managers. For integrated network management, we present the architectures of an XML‐based manager, an XML‐based agent, and an XML/SNMP gateway for legacy SNMP agents. We describe our experience of developing an XML‐based network management system (XNMS), XML‐based agent, and an XML/SNMP gateway. We also verify the effectiveness of our XML‐based agent and XML/SNMP gateway through performance tests. Our experience with developing XNMS and XML‐based agents can be used as a guideline for development of XML‐based management systems that fully take advantage of the strengths of XML technologies.     

一种安全网络管理协议的设计与实现

文章以SNMP简单网络管理协议为参照对象,针对SNMP协议现有的一些安全隐患及管理效率的不足,从安全性增强和新型管理库(TLV)设计的角度介绍了一种增强型安全网络管理协议的设计思路及实现方案,并且通过介绍该协议在工程中的应用情况,体现了使用该协议可增加网络传输安全性、可扩展性强和可提高管理效率等优势。     

Development of SNMP‐XML translator and gateway for XML‐based integrated network management

The research objective of our work is to develop a SNMP MIB to XML translation algorithm and to implement an SNMP‐XML gateway using this algorithm. The gateway is used to transfer management information between an XML‐based manager and SNMP‐based agents. SNMP is widely used for Internet management, but SNMP is insufficient to manage continuously expanding networks because of constraints in scalability and efficiency. XML–based network management architectures are newly proposed as alternatives to SNMP‐based network management, but the XML‐based Network Management System (XML‐based NMS) cannot directly manage legacy SNMP agents. We also implemented an automatic specification translator (SNMP MIB to XML Translator) and an SNMP‐XML gateway. Copyright © 2003 John Wiley &Sons, Ltd.     

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NET-SNMP的嵌入式网络管理代理的开发

文中介绍了如何利用软件开发包,在屏蔽大部分低层细节的基础上,实现SNMP网络管理代理的设计。在嵌入式操作系统之上,论述了树型结构数据库MIB模块的增加,以及基于NET-SNMP网络代理的扩展开发和嵌入式网络管理代理的具体实现。表现了简单网络管理协议SNMP自身的简单实用性,以及Agent X协议为网络设备带来的可扩展性,达到了小型设备上运行子代理,发送数据给主代理来完成SNMP协议的通信过程。     

IoTScal‐H : Hybrid monitoring solution based on cloud computing for autonomic middleware‐level scalability management within IoT systems and different SLA traffic requirements

Wireless sensor network (WSN) technologies have enabled ubiquitous sensing to intersect many areas of modern day living. The creation of these devices offers the ability to get, gather, exchange, and consume environmental measurement from the physical world in a communicating‐actuating network, called the Internet of Things (IoT). As the number of physical world objects from heterogeneous network environments grows, the data produced by these objects raise uncontrollably, bringing a delicate challenge into scalability management in the IoT networks. Cloud computing is a much more mature technology, offering unlimited virtual capabilities in terms of storage capacity and processing power. Ostensibly, it seems that cloud computing and IoT are evolving independently on their own paths, but in reality, the integration of clouds with IoT will lead to deal with the inability to scale automatically depending on the overload caused by the drastic growth of the number of connected devices and/or by the huge amount of exchanged data in the IoT networks. In this paper, our objective is to promote the scalability management, using hybrid mechanism that will combine traffic‐oriented mechanism and resources‐oriented mechanism, with adaption actions. By the use of autonomic middleware within IoT systems, we seek to improve the monitoring components's architectural design, based on cloud computing‐oriented scalability solution. The intention is to maximize the number of satisfied requests, while maintaining at an acceptable QoS level of the system performances (RTT of the system, RAM, and CPU of the middleware). In order to evaluate our solution performance, we have performed different scenarios testbed experiments. Generally, our proposed results are better than those mentioned as reference.     

Ad Hoc网络中SNMP代理的研究和实现

研究了在基于TCP／IP体制的Ad Hoc网络中,利用简单网络管理协议SNMP和网管代理解决严重和复杂的网络管理问题。在分析SNMP协议工作原理的基础上,探讨了SNMP代理的工作流程、组成模块和实现方式,并搭建Ad Hoc网络实验环境进行了测试验证。实验结果表明,通过SNMP协议和代理,能够有效管理和控制Ad Hoc网络中的关键参数,降低了系统的复杂程度和技术风险。     

ForCES体系结构中支持SNMP 的FE代理端的研究和实现

网络管理系统由网管站、管理代理、管理信息数据库和网络管理协议构成.简单网络管理协议（SNMP）包括管理信息结构（SMI）、管理信息库（MIB）和SNMP 三部分.首先介绍了ForCES体系结构、ForCES最新进展和SNMP简单网络管理协议,然后提出了一种ForCES支持SNMP的方案,并指出了ForCES结构下的路由器在实现网络管理上的主要问题和困难,最后给出了如何利用网络管理软件开发ForCES模型中FE端SNMP代理的具体方法.     

通信设备的SNMP网管系统代理端的设计

SNMP方式网管是一种有效便利的网络管理方式,文章提出了一种基于Rabbit 2000网络处理器和Dynamic C语言的SNMP网管系统的嵌人式代理端解决方案,它可以将以前应用较为广泛的通信设备的串口(RS232／485／422)网管方式平滑升级到SNMP网管方式。     

一种面向对象的自主网络管理模型

针对ＳＮＭＰ协议的局限性,将网络管理信息在被管对象和网管对象两个层次上进行抽象;给出了网管对象的语义及自主网管代理Ａｇｅｎｔ的形式化描述;并基于此设计了一种实现高层网管功能的自主网络管理模型。使用这一网管模型,能使网络管理的结构规范、清晰;便于扩充网管功能;并易于实现两个网络系统间的交互和合作。     

An MPEG‐4 Compliant Interactive Multimedia Streaming Platform Using Overlay Networks

This paper presents a multimedia streaming platform for efficiently transmitting MPEG‐4 content over IP networks. The platform includes an MPEG‐4 compliant streaming server and client, supporting object‐based representation of multimedia scenes, interactivity, and advanced encoding profiles defined by the ISO standard. For scalability purposes, we employ an application‐layer multicast scheme for media transmission using overlay networks. The overlay network, governed by the central entity of the network distribution manager, is dynamically deployed according to a set of pre‐defined criteria. The overlay network supports both broadcast delivery and video‐on‐demand content. The multimedia streaming platform is standards‐compliant and utilizes widespread multimedia protocols such as MPEG‐4, real‐time transport protocol, real‐time transport control protocol, and real‐time streaming protocol. The design of the overlay network was architected with the goal of transparency to both the streaming server and the client. As a result, many commercial implementations that use industry‐standard protocols can be plugged into the architecture relatively painlessly and can enjoy the benefits of the platform.     

基于SNMP的区分协议流量监控系统

网络流量监控已成为当前网络管理的重要分支之一。通过分析简单网络管理协议（SNMP）和管理信息库（MIB）,针对一般流量监控方法的不足,系统采用SNMP开发包工具即snmp^＋＋提供的二次接口,提出了一种基于SNMP协议实现区分协议流量统计的方法。在此通过技术手段收集流量相关信息,了解网络的性能和局域网对新网络的流量要求,以便于网管员做出精确的网络控制。     

基于SNMP的网络管理的原理与实现

论述了网络管理标准化的必要性 ,介绍了基于TCP/IP的SNMP协议的概念、模型、协议与操作 ,描述了基于SNMP的网络管理的原理和实现。最后 ,在SNMP网络管理系统设计的过程和原则上提出了一些看法     

Management of cognitive radio ad hoc networks using a congestion‐based metric

In this paper, we propose a new network management protocol to address the unique challenges of managing cognitive radio ad hoc networks that have distributed, multihop architectures with dynamic spectrum availability. We focus on performance management for these networks, and address the problem of network congestion for secondary users, because of its significant impact on data throughput. Specifically, we define a performance metric, the average congestion level of the network, and derive it analytically as a function of the primary users’ activities and the secondary users’ strategy. For practical implementation, we further propose a cluster‐based management architecture that utilizes a designated central manager and cluster heads that function as distributed managers. The cluster heads collect information from multiple layers of the protocol stack using new MIB (management information base) variables to capture the characteristics of cognitive radio ad hoc networks, such as the location‐dependent spectrum availability. The objective of the management action is to utilize a network‐level view of the congestion situation in the network by directing the secondary users to select the highest‐quality links available and avoid congested clusters. This hierarchical networkmanagement design allows us to take advantage of its scalability to achieve near‐real‐time management. Numerical results demonstrate the effectiveness of the proposed scheme. Copyright © 2013 John Wiley & Sons, Ltd.     

A Scalable,Distributed Middleware Service Architecture to Support Mobile Internet Applications

Middleware layers placed between user clients and application servers have been used to perform a variety of functions to support the vision of nomadic computing across varying platforms. In previous work we have used middleware to perform a new capability, application session handoff, using a single Middleware Server to provide all functionality. However, to improve the scalability of our architecture, we have designed an efficient distributed Middleware Service layer that properly maintains application session handoff semantics while being able to service a large number of clients. We show that this service layer improves the scalability of general client-to-application server interaction as well as the specific case of application session handoff. We detail protocols involved in performing handoff and analyse an implementation of the architecture that supports the use of a real medical teaching tool. From experimental results it can be seen that our Middleware Service effectively provides scalability as a response to increased workload.     

Study of MANET routing protocols by GloMoSim simulator

This paper compares ad hoc on‐demand distance vector (AODV), dynamic source routing (DSR) and wireless routing protocol (WRP) for MANETs to distance vector protocol to better understand the major characteristics of the three routing protocols, using a parallel discrete event‐driven simulator, GloMoSim. MANET (mobile ad hoc network) is a multi‐hop wireless network without a fixed infrastructure. Following are some of our key findings: (1) AODV is most sensitive to changes in traffic load in the messaging overhead for routing. The number of control packets generated by AODV became 36 times larger when the traffic load was increased. For distance vector, WRP and DSR, their increase was approximately 1.3 times, 1.1 times and 7.6 times, respectively. (2) Two advantages common in the three MANET routing protocols compared to classical distance vector protocol were identified to be scalability for node mobility in end‐to‐end delay and scalability for node density in messaging overhead. (3) WRP resulted in the shortest delay and highest packet delivery rate, implying that WRP will be the best for real‐time applications in the four protocols compared. WRP demonstrated the best traffic scalability; control overhead will not increase much when traffic load increases. Copyright © 2005 John Wiley & Sons, Ltd.     

SNMP代理扩展实现通信电源设备的管理

介绍了网络管理协议SNMP和SNMP代理的扩展,并结合实际项目在Linux系统下,利用net-snmp免费代码开放软件包实现SNMP代理的扩展。     

基于Web的集中式通信设备监控系统的体系结构研究

通信设备监控系统的作用就是对通信台站所属设备进行实时的参数与状态的监视、控制和管理，他是通信网络管理的重要组成部分。要实现不同通信台站设备的集中管理和网络化管理，就需要制定统一的管理规范，并统一设计通信台站监控和管理体系框架。本文深入研究了基于Web的网络管理技术；介绍了基于Web的网络管理标准和实现方式；进而提出了基于Web的集中式通信设备监控系统的软件体系结构，并对这种软件体系结构的核心实现技术：SNMP网络管理协议和主流软件中间件技术包括COM／DCOM，CORBA／CCM和EJB／J2EE技术及其对比进行了介绍。     

SNMP代理模拟工具的设计与实现

简单网络管理协议(SNMP) 是目前应用最广泛的网络管理协议.文章设计了一种SNMP代理模拟工具,通过分析设备管理信息库(MIB)文件提供的设备信息、模拟代理和管理软件的通信,实现了对多厂商、多种类设备环境的模拟,满足了网管项目开发和测试过程中的环境需要.     

基于SNMP的有线电视网络管理系统

介绍HFC网络管理系统的组成,指出这项技术应用的局限性.提出基于通用MCU开发的支持SNMP协议的光收发网管系统,从硬件和软件的角度介绍了该系统各模块的功能和实现方法,包括物理层通信、协议处理、数据处理等.最后对各功能模块组成的电路系统进行了测试,实验结果完全符合SNMP协议.