Cisco发现协议CiscoDiscoveryProtocolPPT课件

1、Cisco发现协议发现协议Cisco Discovery Protocol深圳职业技术学院计算机系网络专业第1页/共14页教学目标（教学目标（ Objectives ） 1. Cisco发现协议特征（Feature of Cisco Discovery Protocol ） 命令（CDP Command ） 3.开启和关闭CDP（Enable and disable CDP） 4. 远程登录（telnet ） 第2页/共14页Cisco发现协议（发现协议（ Cisco Discovery Protocol ） 提供的专有的命令 CDP runs on all Cisco equipment 2

2、.获得直接连接的设备的信息摘要 The primary use of CDP is to discover all Cisco devices that are directly connected to a local device. 3.运行在数据链路层 Cisco Discovery Protocol (CDP) is a Layer 2 protocol 版本1在版本后会自动启动 CDP Version 1 is enabled by default with Cisco IOS (Release 10.3 later). 更新周期60秒 CDP update timer is 60s

3、 过期周期180秒 CDP hold timer is 180s第3页/共14页 信息摘要包括（Summary information includes）: 设备ID（Device ID） 本地接口（Local Interface ） 保持时间（Holdtime ） 功能（Capability ） 平台（Platform ） 端口ID（Port ID ） VTP域名（VTP Management Domain Name (CDPv2 only) ） 本征VLAN（Native VLAN (CDPv2 only) ） 全双工/半双工（Full/Half-Duplex (CDPv2 only) ）

4、CDPshow cdpCDPCDP用用CDP发现邻居（发现邻居（Discovering Neighbors with CDP）第4页/共14页Using the show cdp neighbor CommandRouterA#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 Po

5、rt IDRouterB Ser 0 148 R 2522 Ser 1SwitchA Eth 0 167 T S 1900 2 SwitchBRouterARouterBSwitchAS0S1第5页/共14页Using the show cdp entry CommandRouterA#sh cdp entry *-Device ID: RouterB Entry address(es): IP address: Platform: cisco 2522, Capabilities: Router Interface: Serial0, Port ID (outgoing p

6、ort): Serial1Holdtime : 168 secVersion :Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-JS-L), Version 12.0(3), RELEASE SOFTWARE (fci)Copyright (c) 1986-1999 by cisco Systems, Inc.Compiled Mon 08-Feb-99 18:18 by phanguyeSwitchBRouterARouterBSwitchAS0S1第6页/共14页CDP其它命令（其它命令（

7、Additional CDP Commands）RouterA#sh cdp trafficCDP 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

8、every 60 seconds Holdtime is 180 secondsSwitchBRouterARouterBSwitchAS0S1第7页/共14页1. 在全局配置模式下使用（no）cdp run 命令开启或关闭所由接口的CDP功能。默认情况下，CDP被全局开启。The cdp run command is used to enable CDP globally on the router. By default, CDP is globally enabled. 2.在接口模式下使用（no） cdp enable 命令可以开启或关闭某个特定接口的CDP功能。CDP could b

9、e enabled on each of the devices interfaces by using the cdp enable command. 开启和关闭开启和关闭CDP（Enable and disable CDP）第8页/共14页配置周期（配置周期（Configuring Timer） Router(config)#cdp timer 5 Router(config)# cdp holdtime 15第9页/共14页用用telnet连接到远程主机连接到远程主机（Using Telnet to Connect to Remote Devices）Remote deviceSwitc

10、hBRouterARouterBSwitchAS0S1RouterA#telnet Trying . Open-Catalyst 1900 Management ConsoleCopyright (c) Cisco Systems, Inc. 1993-1998All rights reserved.Enterprise Edition SoftwareEthernet Address: 00-90-86-73-33-40PCA Number: 73-2239-06PCA Serial Number: FAA02359H8KModel Number: WS-C1924-ENS

11、ystem Serial Number: FAA0237X0FQ.RouterB第10页/共14页查看查看telnet连接（连接（Viewing Telnet Connections）SwitchBRouterARouterBSwitchAS0S1RouterA#sh sessionConn Host Address Byte Idle Conn NameRouterA#sh user Line User Host(s) Idle Location* 0 con 0 3 2 第11页/共14页挂起挂起telnet会话（会话（Suspending a Telnet Session）SwitchBRouterARouterBSwitchAS0S1RouterB# xRouterA#sh sessionConn Host Address Byte Idle Conn NameRouterA#resume 1RouterB#第12页/共14页RouterA#disconnect Closing connection to confirmRouterA#clear line 11confirm