实验3：CDP命令操作

 Cisco Discovery Protocol （CDP）从名字我们就可以看出这是Cisco专有的了，建议大家学习CCNA的时候尽量熟悉全拼 不要简单的记下缩写！ CDP可以收集相邻的设备的硬件和协议信息 CDP有两个全局参数 ，可以进行设置 CDP timer(CDP定时器) 和 CDP holdtime（保持时间） CDP定时器是多长时间将CDP数据包传输到所有接口的时间量。 CDP保持时间是设备保留从相邻设备接收到的数据包的时间量。 下面介绍下CDP的几个命令和区别 show cdp neighbors :作用是显示有关直连设备的信息，其中包括设备的主机名，接收数据包的端口或接口，保持时间，邻居设备的性能，设备类型和连接的端口ID show cdp neighbors detail 显示的就比较详细了 和以上比较多了，直连设备的IP地址和IOS版本号。 show cdp entry * 与 show cdp neighbors detail 相同。 show cdp entry * protocols 显示直连邻居的IP地址。 show cdp entry * version 显示直连邻居的IOS版本。 show cdp traffic 显示了设备发送和接收的CDP数据包。 show cdp interface 显示每个接口使用的CDP信息，包括线路的封装类型，定时器和保持时间。 关闭CDP服务 no cdp run ,关闭某个接口的CDP 进入接口模式下 no cdp enable 当大家看完以上的命令的时候，想象一下，给你一个路由器 然后需要你根据CDP的 信息来配置IP和线缆的连接类型 以及设备类型 ，大家应该能做出来吧！下面我们来做以上实验

Router>en Router#conf t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#host ccna1                                   设置路由器名 ccna1(config)#enable password cisco1            设置password ccna1(config)#enable secret cisco2                   设置secret ccna1(config)#line vty 0 4 ccna1(config-line)#login % Login disabled on line 66, until 'password' is set % Login disabled on line 67, until 'password' is set % Login disabled on line 68, until 'password' is set % Login disabled on line 69, until 'password' is set % Login disabled on line 70, until 'password' is set ccna1(config-line)#pass cisco3                            设置vty密码 ccna1(config-line)#exit ccna1(config)#service password-encryption ccna1(config)#int s1/1/0 ccna1(config-if)#ip add 202.119.249.1 255.255.255.0                    设置s0 ccna1(config-if)#clock rate 56000 ccna1(config-if)#no shut

%LINK-5-CHANGED: Interface Serial1/1/0, changed state to down ccna1(config-if)#exit ccna1(config)#exit %SYS-5-CONFIG_I: Configured from console by console ccna1#

ccna2配置

Router>en Router#Conf t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#host ccna2 ccna2(config)#enable password cisco1 ccna2(config)#enable secret cisco2 ccna2(config)#line vty 0 4 ccna2(config-line)#login % Login disabled on line 66, until 'password' is set % Login disabled on line 67, until 'password' is set % Login disabled on line 68, until 'password' is set % Login disabled on line 69, until 'password' is set % Login disabled on line 70, until 'password' is set ccna2(config-line)#password cisco3 ccna2(config-line)#exit ccna2(config)#service password-encryption ccna2(config)#int s1/1/0 ccna2(config-if)#ip add 202.119.249.2 255.255.255.0 ccna2(config-if)#no shut

%LINK-5-CHANGED: Interface Serial1/1/0, changed state to up ccna2(config-if)#exit ccna2(config)#int s1/1/1 ccna2(config-if)#ip add 202.119.248.1 255.255.255.0 ccna2(config-if)#clock rate 56000 ccna2(config-if)#no shut

%LINK-5-CHANGED: Interface Serial1/1/1, changed state to down ccna2(config-if)#end %SYS-5-CONFIG_I: Configured from console by console

ccna3配置

Router>en Router#conf t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#host ccna3 ccna3(config)#enable password cisco1 ccna3(config)#enable secret cisco2 ccna3(config)#line vty 0 4 ccna3(config-line)#login % Login disabled on line 66, until 'password' is set % Login disabled on line 67, until 'password' is set % Login disabled on line 68, until 'password' is set % Login disabled on line 69, until 'password' is set % Login disabled on line 70, until 'password' is set ccna3(config-line)#pass cisco3 ccna3(config-line)#exit ccna3(config)#service password-encryption ccna3(config)#int s1/1/0 ccna3(config-if)#ip add 202.119.248.2 255.255.255.0 ccna3(config-if)#no shut

%LINK-5-CHANGED: Interface Serial1/1/0, changed state to up ccna3(config-if)# %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1/0, changed state to upend %SYS-5-CONFIG_I: Configured from console by console ccna3#

主要内容ccna2上操作： ccna2>en Password: ccna2#show cdp neighbors Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge                   S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone Device ID    Local Intrfce   Holdtme    Capability   Platform    Port ID ccna1        Ser 1/1/0        167            R       C2800       Ser 1/1/0 ccna3        Ser 1/1/1        161            R       C2800       Ser 1/1/0 ccna2#show cdp Global CDP information:     Sending CDP packets every 60 seconds     Sending a holdtime value of 180 seconds     Sending CDPv2 advertisements is enabled

ccna2#show cdp entry *

Device ID: ccna1 Entry address(es):   IP address : 202.119.249.1 Platform: cisco C2800, Capabilities: Router Interface: Serial1/1/0, Port ID (outgoing port): Serial1/1/0 Holdtime: 158

Version : Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2007 by Cisco Systems, Inc. Compiled Wed 18-Jul-07 06:21 by pt_rel_team

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Device ID: ccna3 Entry address(es):   IP address : 202.119.248.2 Platform: cisco C2800, Capabilities: Router Interface: Serial1/1/1, Port ID (outgoing port): Serial1/1/0 Holdtime: 152

Version : Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2007 by Cisco Systems, Inc. Compiled Wed 18-Jul-07 06:21 by pt_rel_team

advertisement version: 2 Duplex: full

ccna2#show cdp entry ccna1

Device ID: ccna1 Entry address(es):   IP address : 202.119.249.1 Platform: cisco C2800, Capabilities: Router Interface: Serial1/1/0, Port ID (outgoing port): Serial1/1/0 Holdtime: 139

Version : Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2007 by Cisco Systems, Inc. Compiled Wed 18-Jul-07 06:21 by pt_rel_team

advertisement version: 2 Duplex: full ---------------------------

ccna2#show cdp entry ccna3

Device ID: ccna3 Entry address(es):   IP address : 202.119.248.2 Platform: cisco C2800, Capabilities: Router Interface: Serial1/1/1, Port ID (outgoing port): Serial1/1/0 Holdtime: 129

Version : Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2007 by Cisco Systems, Inc. Compiled Wed 18-Jul-07 06:21 by pt_rel_team

advertisement version: 2 Duplex: full ---------------------------

ccna2#show cdp entry ccna2

ccna2#un all All possible debugging has been turned off

ccna2#conf t Enter configuration commands, one per line.  End with CNTL/Z. ccna2(config)#cdp run ccna2(config)#exit %SYS-5-CONFIG_I: Configured from console by console ccna2#show cdp interfac Vlan1 is administratively down, line protocol is down   Sending CDP packets every 60 seconds   Holdtime is 180 seconds FastEthernet0/0 is administratively down, line protocol is down   Sending CDP packets every 60 seconds   Holdtime is 180 seconds FastEthernet0/1 is administratively down, line protocol is down   Sending CDP packets every 60 seconds   Holdtime is 180 seconds Serial1/1/0 is up, line protocol is up   Sending CDP packets every 60 seconds   Holdtime is 180 seconds Serial1/1/1 is up, line protocol is up   Sending CDP packets every 60 seconds   Holdtime is 180 seconds ccna2#debug ?   eigrp        EIGRP Protocol information   frame-relay  Frame Relay   ip           IP information

搞定。。。。。