基于CORBA的网管接口一致性测试方法学的研究

本文提出了一种基于CORBA的网络管理接口的一致性测试方法。本方法在现有协议实体和管理信息库（MIB）的一致性测试方法的基础上作出相应的扩充,包括测试方法论、IDL测试器的功能结构,并指出当前存在的问题以及未来的理论研究方向。     

An Isochronous Testing Strategy for Hierarchical Adaptive Distributed System-Level Diagnosis

Distributed System-level diagnosis allows the fault-free components of a fault-tolerant distributed system to determine which components of the system are faulty and which are fault-free. The time it takes for nodes running the algorithm to diagnose a new event is called the algorithm's latency. In this paper we present a new distributed system-level diagnosis algorithm which presents a latency of O(log N) testing rounds, for a system of N nodes. A previous hierarchical distributed system-level diagnosis algorithm, Hi-ADSD, presents a latency of O(log ² N) testing rounds. Nodes are grouped in progressively larger logical clusters for the purpose of testing. The algorithm employs an isochronous testing strategy that forces all fault-free nodes to execute tests on clusters of the same size each testing round. This strategy is based on two main principles: a tested node must test its tester in the same round; a node only accepts tests according to a lexical priority order. We present formal proofs that the algorithm's latency is at most 2log N – 1 testing rounds and that the testing strategy of the algorithm leads to the execution of isochronous tests. Simulation results are shown for systems of up to 64 nodes.     

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.     

以太网无源光网络系统中MIB的实现

以太网无源光网络是宽带接入的最有效方式之一。网络管理对于以太网无源光网络进入电信领域,增强以太网无源光网络设备的互通性有着重要意义。对提议的以太网无源光网络系统的管理信息库作一简单的介绍,并在Linux系统上开发代理,通过简单网络管理协议实现对以太网无源光网络系统的管理。     

基于ECAN同轴接入技术实现SNMP网管软件代理

以太同轴接入网(ECAN)同轴宽带技术作为一种三网融合的解决方案提出,拥有良好的发展前景.网络管理在设备的正常运行中起着重要作用.描述了基于简单网络管理协议(SNMP)的ECAN网管系统以及代理的实现方案,其中包括ECAN系统的管理信息库(MIB)以及采用SNMP协议的ECAN网管代理软件的实现.     

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MoCA技术的同轴接入网MIB的实现

基于MoCA技术的同轴接入网应用前景广阔,网络管理对其正常的运行和维护至关重要。对MoCA及其参考MIB（管理信息库）作了介绍,并在Linux系统上开发代理,这样即可通过SNMP协议实现对MoCA设备的管理。     

机架式HFC设备管理代理的实现

描述了基于国标《HFC网络设备管理规范》的机架式HFC设备的SNMP代理实现方法。首先对《HFC网络设备管理规范》进行了简单介绍,指出了管理机架式HFC设备所要用到的国标中的相关MIB定义,然后根据机架式HFC设备的管理需求,参照国标的管理方法及SCTE的定义,自定义了机架式HFC设备模块的管理MIB,并对机架式HFC设备管理的公用部分MIB和光设备管理节点下的MIB进行了详细说明。     

Development and testing of an SNMP‐based integrated management system for heterogeneous power line communication networks

Power line communication (PLC) is an evolving technology which uses existing power lines for data transmission. Like any other communication network, PLC networks need to be managed to ensure efficient use of resources and secure operations. Currently, major PLC chip vendors are trying to provide network management solutions based on the Simple Network Management Protocol (SNMP) by developing their own management systems, but they cannot manage heterogeneous PLC networks comprised of PLC devices from various PLC chip vendors. In this paper, we provide our experience of developing and testing an integrated management system for a heterogeneous PLC network based on SNMP. We present our approach for integrated management by defining the common PLC management information base (MIB) and an integrated PLC proxy agent for providing interoperability to legacy PLC devices which do not support the common PLC MIB. We also present the development of an integrated PLC network management system and its test in heterogeneous PLC networks deployed in South Korea. The contribution of our work is to provide a guideline for developing and testing integrated NMSs for any heterogeneous networks including PLC networks. Copyright © 2009 John Wiley & Sons, Ltd.     

MoDiVHA: A Hierarchical Strategy for Distributed Test Assignment

Distributed diagnosis allows a set of fault-free nodes to monitor the state of all nodes of a given system. Diagnosis is based on the results of tests, which are assigned among system nodes. Hierarchical testing assignments lead to efficient and scalable diagnosis algorithms, both in terms of the number of tests executed, and the latency. In this work we present a novel hierarchical testing strategy, called MoDiVHA. By obtaining as much diagnostic information as possible from each test, and avoiding tests on nodes about which information has been already obtained, MoDiVHA executes less tests in comparison with previously proposed assignments. Experimental results are presented from three series of simulations conducted to compute the number of tests and diagnosis latency for various system sizes and fault situations.     

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。     

A framework for network quality monitoring in the VoIP environment

Monitoring speech quality in Voice over IP (VoIP) networks is important to ensure a minimal acceptable level of speech quality for IP calls running through a managed network. Information such as packet loss, codec type, jitter, end‐to‐end delay and overall speech quality enables the network manager to verify and accurately tune parameters in order to adjust network problems. The present article proposes the deployment of a monitoring architecture that collects, stores and displays speech quality information about concluded voice calls. This architecture is based on our proposed MIB (Management Information Base) VOIPQOS, deployed for speech quality monitoring purposes. Currently, the architecture is totally implemented, but under adjustment and validation tests. In the future, the VOIPQOS MIB can be expanded to automatically analyze collected data and control VoIP clients and network parameters for tuning the overall speech quality of ongoing calls. Copyright © 2006 John Wiley & Sons, Ltd.     

分布式入侵检测系统的体系架构

由于 ＴＣＰ／ＩＰ协议的开放性，目前的网络极易受到攻击。网络入侵行为，特别是分布式入侵行为，给网络的正常运行造成了巨大的危害，阻碍了网络经济的迅速发展。为了能有效地检测和跟踪入侵行为，这里提出了一个基于智能代理的入侵检测系统的体系结构和分布跟踪算法。该系统是一个分布式实时入侵检测系统，它由智能的主机代理、网络代理和路由器／网关代理组咸。每个智能代理都是独立的实体，拥有解决问题的不完全的信息或能力，通过协同工作并使用分布跟踪算法，实时检测网络入侵行为，跟踪网络入侵者，有效地维护网络安全。     

TMN-MIB编译器的实现研究

 在电信管理网(TMN)中,网络管理信息库(MIB)中被管对象的信息结构是由被管对象定义指南(GDMO)和一号抽象语法标记(ASN.1)描述的,本文提出了一种TMN-MIB编译器,即将由此定义的结构转换为用C++语言描述的实现方法.该方法首先定义了便于描述网络管理信息的容器类,完成了ASN.1类型和GDMO模板的C++描述,在此基础上讨论了MIB编译器生成ASN.1和GDMO模块的过程,最后介绍了编译器输出提供的应用程序接口(API).     

HFC机房监控设备Snmp管理数据库设计初探

针对HFC机房监控设备的管理需求,归纳整理管理数据的一般性,设计了HFC机房监控设备实现SNMP管理所需的管理数据库(MIB),并对此进行了详尽的说明,结合国家标准《HFC网络设备管理规范》(GB/T 20030-2005)中的相关MIB定义,可以完整地实现HFC机房监控设备SNMP管理代理服务器,从而使得对HFC机房监控设备的管理也可以像管理HFC设备一样,实现SNMP管理。     

Security considerations in a network management environment

Considers the security aspects of communication between two management processes operating in different management domains; identifies two major risks: the security of information exchanged during the management association, and control of access to the management information base (MIB); and enumerates the various threats that must be guarded against and possible methods of attack. Security techniques, including symmetric and public key cryptosystems, are employed in the design of a method of achieving a secure management association. A scheme of authorization control for MIB access is developed. The management of an open system's network resources takes place in the context of a management association. The resources themselves are controlled by an agent process which presents a view of these resources to the outside world as a number of managed objects, each of which contains a number of attributes. The collection of objects presented to the outside world by the agent is known as the MIB. A manager process regulates the operation of the managed resources by engaging in a management association with the agent and instructing it to carry out simple operations on elements of the MIB. Within a single management domain where all processing nodes and network links are under the control of the same administration, security is not such a critical issue. However, when the management association takes place across the boundary between two separate management domains, and make use of public data networks, security issues must be considered in greater detail     

用于智能光网络自动发现机制的LMP MIB扩展

自动发现机制是智能光网络引入控制平面以后带来的一个新的功能,是智能光网络与传统光网络相区别的重要特点之一。首先对光网络自动发现机制进行分析,将自动发现机制分为初始配置、邻居发现、终端注册和服务发现四个部分;在对自动发现机制进行分析的基础之上,提出了链路资源管理协议(LMP)MIB信息库的扩展定义,由此网管系统可以通过SNMP对自动发现机制进行初始配置并跟踪自动发现机制的结果。     

基于移动代理网管平台的集成化系统模型研究

基于移动代理网管平台是一个重要的研究方向，针对该方向研究中出现的一些问题，本文提出一系列的解决方案。利用SNMP V3和移动代理的安全方案，提出了一个集成化的移动代理网管安全模型；引入JMX中间层作为标准化的平台接口：设计一个MIB接口解决网管和移动代理的互操作问题。最后将这个平台的结构进行了细化，并与原有管理模型进行了比较分析。