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1、华中科技大学硕士学位论文基于VxWorks的EPON网管代理的设计与实现姓名：王卉申请学位级别：硕士专业：光电信息工程指导教师：刘德明20070522I摘 要 人们对网络信息需求的增长推动互联网的不断发展。随着骨干网带宽的升级，接入网的速率“瓶颈”显得尤为突出。现有的接入网技术无法满足不断增长的宽带用户的需求，视频点播、网络会议等综合业务的应用对接入网的带宽能力提出了更高的要求。以太无源光网络（EPON）综合了以太网简单、成熟、低成本的特点以及无源光网络（PON）的带宽优势，成为最有前景的宽带接入技术解决方案之一。 随着 EPON 技术的不断完善成熟及其产业化的扩展，建立安全、高效的 EPON
2、 网管代理系统成为光纤到户（FTTH）进程中，EPON 广泛部署和应用的关键。本课题是在国家 863 课题“基于千兆以太网的无源光网络”及其后续产业化项目的资助下进行的，完成了 EPON 嵌入式网管代理的设计和实现，并通过了中国电信 EPON 设备的系统测试。论文的主要贡献包括以下几点： 系统研究了简单网络管理协议（SNMP）的理论体系。讨论了 SNMP 的二层、三层模型框架，指出代管（Proxy）的开发是实现 EPON 统一网管系统构架与多协议管理实体融合的关键。详细分析了管理信息结构（SMI）和管理信息库（MIB）的组织结构及编码规则，介绍了 SNMP 报文格式及处理流程。 设计了 EPO
3、N 系统的管理信息库（MIB）模型。分析了 EPON 系统局端设备光链路终端（OLT）和用户端设备光网络单元（ONU）的硬件及嵌入式软件结构，讨论了EPON 系统支持的业务和服务模块，在此基础上以网管的功能类型为划分，设计了EPON 系统的 MIB 模型，给出了 EPON 私有 MIB 的组织结构及定义实现。 在 VxWoks 操作系统平台下实现了 EPON 嵌入式网管代理的开发。从 SNMP 环境平台的建立、MIB 定义文件的编译、MIB 访问例程的实现、仿真环境下的验证、嵌入式硬件平台下的实现等 5 个方面，系统阐述了网管代理的实现流程。仿真结果证明代理功能可行、易于操作和维护。 在嵌入式
4、硬件环境下进行了 EPON 系统网管代理的功能测试和性能分析评估。结果证明网管代理完全满足 EPON 设备管理、业务服务管理和网络性能、故障监控的要求。但在大量 MIB 信息批量查询时，网管代理的流量、延时等性能指标还有待提高。 II在网管代理性能分析的基础上，从 SNMP 报文格式的优化、内存数据库的引入和EPON 系统私有 MIB 的模块化设计等 3 个方面讨论了网管代理实现的改进方向。 关键词：关键词：以太无源光网络 网络管理 简单网络管理协议 嵌入式网管代理 IIIAbstract Driven by the increase of peoples need for network i
5、nformation and service, Internet continuously develops. On contrary to the bandwidth upgrade of backbone networks, the bottleneck of speed in access networks becomes more and more serious. Current access technology cannot satisfy the increasing broadband users requirement. In addition, the applicati
6、on of integrated services such as video on demand (VOD) and network conference requires higher bandwidth ability. Ethernet Passive Optical Networks (EPON), which combines Ethernet characteristics such as simple, pure and low cost, and bandwidth advantage of Passive Optical networks (PON), becomes on
7、e of the most promising solutions for broadband access technology. Along with EPON technology progress and its industrialized development, it becomes essential for the deployment and application of EPON in FTTH advance to build the secure and effective EPON management agent system. This project is s
8、upported by Chinese 863 plan “Passive Optical Networks based on Gigabit Ethernet”, and its subsequentially industrialized programs. The author accomplished the design and implementation of embedded EPON management agent system, which successfully passed through Chinese Telecoms system test on EPON d
9、evices. The main contributions of this paper include several points: Theoretical architecture of Simple Network Management Protocol (SNMP) is systematically discussed. Based on the discussion of two-level and three-level SNMP model frameworks, the author points out that SNMP Agent Proxy takes place
10、the key part to realize the combination of unified EPON management system and variety of manage protocol instances. The organization and encoding rules of Structure of Management Information (SMI) and Management Information Base (MIB) are specified, and the SNMP message format and SNMP information p
11、rocessing are demonstrated. The MIB modeling for EPON system is expatiated. Based on the analysis of hardware and embedded software structures of Optical Line Terminal (OLT) and Optical Network Unit (ONU) in EPON, and discussion of activities and service models supported by EPON system, the author d
12、esigns the MIB models for EPON systems, and specifies the organization and definition of EPON private MIBs. IVThe EPON embedded management agent under VxWorks OS platform is developed. The author specifies the five steps of agent realization, including building SNMP environment platform, compiling t
13、he MIB files, developing the MIB access routine, verifying the agent function in virtual simulation environment, and realizing the function in embedded processor platform. Simulation results prove that the EPON management agent is available, and easy to operate and maintain. The functional test and
14、performance evaluation of EPON management agent system is implemented in embedded EPON system. The results prove that the agent system can successfully meet the demands of network device management, traffic and service control, network performance supervisal and fault detection. However, the agent c
15、apabilities such as throughputs and latency of the agent need to improve, especially under the variable-binding “walk” operation for large numbered MIB information. Based on the capability analysis of EPON management agent, the author proposed schemes to improve the agent capability, including SNMP
16、message format optimization, memory database instruction and the modularization of EPON MIB platform. Key words: Ethernet Passive Optical Network (EPON) Network management Simple Network Management Protocol (SNMP) Embedded network management agent 独创性声明 本人声明所呈交的学位论文是我个人在导师指导下进行的研究工作及取得的研究成果。尽我所知，除文中已经标明引用的内容外，本论文不包含任何其他个人或集体已经发表或撰写过的研究成果。对本文的研究做出贡献的个人和集体，均已在文中以明确方式标明。本人完全意识到本声明的法律结果由本人承担。 学位论文作者签名： 日期： 年 月 日 学位论文版权使用授权书 本学位论文作者完全了解学校有关保留、使用学位论文的规定，即：学校有权保留并向国家有关部门或机构送交论文的复印
