数据通信课件04ZXR10BCCNL2基础知识及配置以太网交换机工作原理幻灯片.ppt

* 标题不合适，应该改为：几种环路解决方法的选择 * Purpose: Provide a brief review of the subject matter contained within this chapter. Emphasize: Points of discussion for review question 1: The five Spanning Tree states are Blocked, Listen, Learn, Forward, and Disabled. Blocked is the initial state of the port. A port will also be placed in a blocked state if there is a redundant path to the Root Bridge and the port does not have the best cost. Blocked means that the port can send and receive BPDUs but can not send or receive data. * With many years experiences on network installation, test and commissioning, ZTE engineering teams can provide customers with comprehensive Project Implementation services including site survey, network planning and design, on-site supervision, project management, infrastructure construction, system debugging, on-site training project acceptance implementation, etc. We have Captured our expertise in a Flexible Portfolio of Turnkey Services As one of the key telecom vendors in China and important worldwide telecom vendors, ZTE can not only provide operators telecom equipment such as switch, GSM, CDMA, transmission equipment, but also provide IC services for these telecom products.  ZESR的工作方式 A B C D E F Master Transit Transit Transit Transit Transit primary secondary To F LINK DOWN LINK DOWN Forwading ZESR的应用实例 几种环路解决方法的选择 星型网络拓扑 　　－传统的数据网接入方式 生成树STP 　　－用于接入层的交换链路冗余备份，一般采用MSTP 单端口环路检测 　　－怀疑交换机某端口下出现环路时使用 以太环网ZESR 　　－城域以太网技术，尤其适用于组播业务，城域宽带接入网优化改造的解决方案 内容回顾 以太网交换机的工作原理 　　源地址学习 　　目的地址查找转发 环路引入的问题 　　广播风暴 　　地址表漂移 　　帧的重复复制　 解决环路的几种方法 　　生成树STP 单端口环路检测 　　星型网络拓扑 　　以太环网ZESR 思考题 交换机如何处理广播包?如何处理单播包? 传统生成树有哪些问题？如何解决？ 解决环路的方式有哪些？各自的特点是什么？ * C 培不需要stp了,改为以太网工作原理 2010年售后员工和外包商培训资料梳理，陈晋苏。删除STP配置部分。 * * * Slide 1 of 1 Purpose: Emphasize: The next few slides discuss the basic function of a bridge/switch. 1. How it learns the location of the hosts by reading the source mac address of incoming frames. 2. How it makes forwarding/filtering decisions. Th