基于以太网自动保护技术的ZESR协议的研究与优化

发布时间：2018-04-14 01:23

本文选题：生成树协议 + ZESR　；参考：《北京交通大学》2014年硕士论文

【摘要】：摘要：随着互联网应用的普及与发展,网络的带宽和稳定性作为衡量现代计算机网络性能的重要指标,成为计算机网络性能提升的重点。收敛时间是指网络拓扑结构发生改变到该信息同步到路由器的时间,它是网络稳定性的重要指标之一。最初的生成树协议(STP)对网络拓扑改变的收敛时间为30-50s,这远远不能达到现在网络的要求,随后又出现了快速生成树协议(RSTP)和多实例生成树协议(MSTP),但其收敛恢复时间很难维持在1s下,而这对于电信级的以太网50ms的自愈时间要求[25]是远远达不到的,所以人们开始关注收敛时间达毫秒级的以太网自动保护协议(EAPS)。中兴以太网环切换(ZESR)技术就是基于EAPS的以太网环保护协议,它的收敛速度可以在50ms以内,但是ZESR还不成熟,存在很多漏洞与不足。本文主要是从网络的稳定性入手,在对STP进行了详细了解的基础上,主要对ZESR协议进行了深入的分析与研究,发现了其在环路状态检测模块和与MSTP的兼容性方面存在着重大缺陷,本文将针对这两个缺陷进行详细分析并提出了解决方案。全文主要分为以下四部分：第一部分主要介绍了虚拟局域网(VLAN)协议特点、生成树协议的发展和特点(其中包含STP协议、RSTP协议和MSTP协议)以及EAPS协议的原理。第二部分主要分析和研究了ZESR协议模块的业务流程和处理流程,并指出了ZESR的两个重大缺陷。传统的以太网的自愈速度太慢,需要以分钟和秒计,无法达到业务要求。ZESR-ZTE以太环网保护技术基于rfc3619协议的EAPS原理,并在其基础上进行改进,使得收敛时间在50ms以内。但其存在环路状态检测模块和与MSTP的兼容性方面存在着重大缺陷。第三部分针对ZESR的环路检测模块缺陷提出了以Linkhello协议作为解决方案。主要对Linkhello协议的原理、设计方案和修改结果做出了描述。第四部分针对测试中出现的ZESR协议与MSTP协议不兼容而导致的收敛时间过长问题提出了解决方案,通过让ZESR协议强制向MSTP协议发送拓扑改变报文来达到快速收敛,并对结果进行了测试。
[Abstract]:Absrtact: with the popularization and development of Internet applications, the bandwidth and stability of the network as an important index to measure the performance of modern computer networks, has become the focus of improving the performance of computer networks.Convergence time is the time when the network topology changes to synchronize the information to the router. It is one of the important indicators of network stability.The initial spanning tree protocol (STP) converges to 30-50 s for network topology changes, which is far from meeting the requirements of the current network.Then came the Fast spanning Tree Protocol (RSTP) and the Multi-instance spanning Tree Protocol (MSTP). However, the convergence recovery time is very difficult to maintain at 1s, which is far from the requirement of self-healing time for telecom Ethernet 50ms [25].So people begin to pay attention to the Ethernet automatic protection protocol with convergent time of millisecond.ZTE Ethernet Ring switching (ZES) technology is an Ethernet ring protection protocol based on EAPS. Its convergent speed can be within 50ms, but ZESR is not mature, and there are many flaws and shortcomings.This paper mainly starts with the stability of the network, on the basis of the detailed understanding of STP, mainly analyzes and studies the ZESR protocol in depth.It is found that there are some defects in the loop state detection module and its compatibility with MSTP. This paper will analyze the two defects in detail and put forward a solution.The full text is divided into the following four parts:The first part mainly introduces the characteristics of VLAN protocol, the development and characteristics of spanning tree protocol (including STP protocol and MSTP protocol) and the principle of EAPS protocol.The second part mainly analyzes and studies the business process and processing flow of ZESR protocol module, and points out two major defects of ZESR.The self-healing speed of the traditional Ethernet is too slow to meet the service requirements in minutes and seconds, and the EAPS principle of the Ethernet protection technology based on rfc3619 protocol is improved to make the convergence time within 50ms.However, there are some defects in the loop state detection module and compatibility with MSTP.In the third part, the Linkhello protocol is proposed to solve the defect of ZESR loop detection module.The principle, design scheme and modification result of Linkhello protocol are described.In the fourth part, a solution to the problem of long convergence time caused by the incompatibility between ZESR protocol and MSTP protocol is put forward, which can quickly converge by forcing ZESR protocol to send topology change message to MSTP protocol.The results are tested.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.04

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