文档介绍：第八章管理网络环境本章目标?通过本章的学****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?创建一个简单的网络框图并验证该网络?清楚配置文件和IOS映象文件被加载的位置破解密码和升级IOSCDP协议Cisco Discovery Protocol是一个提供关于直接相连的交换机、路由器和其它Cisco设备的综合信息的专有工具CDP work Access Protocol (SNAP)上层地址Cisco专有的链路层协议介质必须能够支持 SNAPTCP/IPNovell IPXCDP能发现并显示关于直接相连的Cisco设备的信息ATMOthersLANs帧中继AppleTalkOthers(IP/IPX)用CDP发现直接相邻的设备? IOS的路由器以及Cisco 交换机和集线器上?能获取的信息包括:?设备名?对应各协议的地址?端口名?角色特征?平台CDPshow cdpCDPCDP使用 #sh cdp ? entry Information for specific neighbor entry interface CDP interface status and configuration neighbors CDP neighbor entries traffic CDP statistics <cr>Router(config)# cdp run Router(config)#interface serial0 Router(config-if)#cdp enable 交换机A同时也显示其Mac地址使用show cdp neighbor 命令Router#sh cdp neighborsCapability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r - RepeaterDevice ID Local Intrfce Holdtme Capability Platform Port IDRouterB Ser 0 148 R 2522 Ser 1SwitchA0050BD855780 Eth 0 167 T S 1900 2 #sh cdp DP counters :Packets output: 56, Input: 38Hdr syntax: 0, Chksum error: 0, Encaps failed: 3No memory: 0, Invalid packet: 0, Fragmented: 0RouterA#sh cdp interface BRI0 is administratively down, line protocol is down Encapsulation HDLC Sending CDP packets every 60 seconds Holdtime is 180 . # Trying ... Open-------------------------------------------------Catalyst 1900 Management ConsoleCopyright (c) Cisco Systems, Inc. 1993-1998All rights Edition Address: 00-90-86-73-33-40PCA Number: 73-2239-06PCA Serial Number: FA