CCNA_第7章管理Cisco设备.ppt

第七章管理Cisco设备 本章目标 通过本章的学习，您应该掌握以下内容: 获取直接相邻设备的信息 获取远程设备的信息 清楚配置文件和IOS映象文件被加载的位置和过程 CDP协议Cisco Discovery Protocol 用CDP发现直接相邻的设备 使用 CDP 使用show cdp neighbor 命令 使用show cdp entry 命令 其它CDP命令 使用ping 和trace 命令 路由器加电/启动顺序 加电自检 (POST) 加载并运行启动引导微代码 寻找IOS映象文件 加载IOS映象文件 寻找配置文件 加载配置文件 正常运行 路由器内部组件 确认当前的配置寄存器值 设定配置寄存器的值 设定配置寄存器的值 配置寄存器的3, 2, 1和0位是启动选项位 设定配置寄存器的值 配置寄存器的3, 2, 1和0位是启动选项位 设定配置寄存器的值 配置寄存器的3, 2, 1和0位是启动选项位 用命令show version来检查配置寄存器的值 寻找IOS映象文件 从Flash加载IOS映象文件 使用 show flash 命令 加载配置文件 使用 show running 和 show startup 命令 本章总结 通过本章的学习，您应该掌握以下内容: 在一个设备上利用CDP获取与其直接相邻的设备信息 用Telnet来获取远端设备的信息 清楚被加载IOS映象文件的位置和过程 Slide 1 of 1 Purpose: Emphasize: Slide 1 of 1 Purpose: Emphasize: This graphic shows the show cdp neighbors command initiated from a router, which displays a summary of the capabilities and access details for the CDP neighbors. The show cdp neighbors detail command shows detailed information about the same devices. Note: If the neighbor is a Cat 1900 switch, the switch mac address is also displayed. If the switch is a 2900xl, its mac address is not displayed. Slide 1 of 1 Purpose: Emphasize: Note: The holdtime indicates how long the neighbor information will be kept in the local CDP table. Slide 1 of 1 Purpose: Emphasize: Note: Some of the CDP commands are not available on the Cat 1900 switch, like “cdp run”, “show cdp traffic”, and “show cdp entry”. Slide 1 of 1 Purpose: Emphasize: The example shows what information can be obtained about RouterA’s neighbor. CDP is one way to learn about other Cisco devices on the network. Slide 1 of 1 Purpose: Emphasize: In a later slide, there is a very detailed flowchart of the router startup process. Slide 1 of 1 Purpose: Emphasize: Note: RAM - Packet buffers, running configurations, running IOS ROM - POST, Rom Monitor, Baby IOS (Rxboot) NVRAM - Backup configurations, Config register Flash - IOS Flash memory is non-volatile. It behaves like a file system. It is more expensive than NVRAM. It is reada