1、1.show cdp 显示 cdp 更新时间及保持时间R1#sh cdp *Mar 1 00:14:28.951: %SYS-5-CONFIG_I: Configured from console by consoleR1#sh cdp neiCapability Codes: R - Router, T - Trans Bridge, B - Source Route BridgeS - Switch, H - Host, I - IGMP, r - RepeaterDevice ID Local Intrfce Holdtme Capability Platform Port IDR2 S
2、er 0/0 167 R S I 3640 Ser 0/02.show cdp neighors 显示每个接口的邻居信息R1#sh cdp neiR1#sh cdp neighbors Capability Codes: R - Router, T - Trans Bridge, B - Source Route BridgeS - Switch, H - Host, I - IGMP, r - RepeaterDevice ID Local Intrfce Holdtme Capability Platform Port IDR2 Ser 0/0 142 R S I 3640 Ser 03.
3、show cdp interface 显示各端口的 cdp 状态。R1#sh cdp intR1#sh cdp interface Serial0/0 is up, line protocol is upEncapsulation HDLCSending CDP packets every 60 secondsHoldtime is 180 secondsSerial0/1 is administratively down, line protocol is downEncapsulation HDLCSending CDP packets every 60 secondsHoldtime i
4、s 180 secondsSerial0/2 is administratively down, line protocol is downEncapsulation HDLCSending CDP packets every 60 secondsHoldtime is 180 secondsSerial0/3 is administratively down, line protocol is downEncapsulation HDLCSending CDP packets every 60 secondsHoldtime is 180 secondsFastEthernet1/0 is
5、administratively down, line protocol is downEncapsulation ARPASending CDP packets every 60 secondsHoldtime is 180 seconds4.show cdp traffic (显示 cdp 广播的数量统计) 本命令显示路由器已发送和接收了多少 cdp 报文。也显示收到了多少错误的 cdp 报文。R1#sh cdp traR1#sh cdp traffic CDP counters :Total packets output: 12, Input: 6Hdr syntax: 0, Chksu
6、m error: 0, Encaps failed: 0No memory: 0, Invalid packet: 0, Fragmented: 0CDP version 1 advertisements output: 0, Input: 0CDP version 2 advertisements output: 12, Input: 65.clear cdp counters 计数从 0 重新开始R1#clear cdp countersR1#6.clear cdp table 将清除路由器的 CDP 表。R1#clear cdp tableR1#7.cdp run 使用 cdp 应用到整
7、个路由器上，而应用 no cdp run 命令将废除任何 cdp 功能。因为缺省设置为应用 cdp，故在路由器配置总不在出现，本命令是全局模式R1(config)#cdp runR1(config)#R1(config)#no cdp runR1(config)#8.cdp enable 和 no cdp enable 在接口下启用 cdp 和关闭 cdpR1(config-if)#cdp enableR1(config-if)#R1(config-if)#no cdp enableR1(config-if)#9.cdp timer 本命令设置路由器发送 cdp 更新数据的间隔，缺省设置为 6
8、0s。本命令为全局模式下。Cdp holdtime 设置保持时间R1(config)#cdp timer 60R1(config)#R1(config)#cdp hR1(config)#cdp holdtime 180R1(config)#10.debug cdo packers 调试R1#debug cdp packets CDP packet info debugging is onR1#11.show cdp entry * 显示整个 cdp 信息R1#show cdp entry *-Device ID: R2Entry address(es): Platform: Cisco 364
9、0, Capabilities: Router Switch IGMP Interface: Serial0/0, Port ID (outgoing port): Serial0/0Holdtime : 134 secVersion :Cisco IOS Software, 3600 Software (C3640-IS-M), Version 12.4(10), RELEASE SOFTWARE (fc1)Technical Support: http:/ (c) 1986-2006 by Cisco Systems, Inc.Compiled Wed 16-Aug-06 04:04 by
10、 prod_rel_teamadvertisement version: 2VTP Management Domain: R1#*Mar 1 00:49:19.171: CDP-PA: Packet received from R2 on interface Serial0/0*Mar 1 00:49:19.175: *Entry found in cache*R1#*Mar 1 00:49:44.723: CDP-PA: version 2 packet sent out on Serial0/0cdp 更新时间的设置范围：R2(config)#cdp timer ?Rate at whic
11、h CDP packets are sent (in sec)cdp 保持时间的设置范围：R2(config)#cdp holdtime ?Length of time (in sec) that receiver must keep this packetshow cdp entry * protocols 显示每个直连邻居的 ip 地址R2#sh cdp entry * protocol Protocol information for R1 :IP address: 192.168.1.1show cdp entry * version 显示邻居打的 ios 版本R2#sh cdp en
12、try * version Version information for R1 :Cisco IOS Software, 3600 Software (C3640-IS-M), Version 12.4(10), RELEASE SOFTWARE (fc1)Technical Support: http:/ (c) 1986-2006 by Cisco Systems, Inc.Compiled Wed 16-Aug-06 04:04 by prod_rel_teamShow cdp entry * 和 show cdp neighbors detail 命令一样R2#sh cdp neig
13、hbors detail -Device ID: R1Entry address(es): IP address: 192.168.1.1Platform: Cisco 3640, Capabilities: Router Switch IGMP Interface: Serial0/0, Port ID (outgoing port): Serial0/0Holdtime : 136 secVersion :Cisco IOS Software, 3600 Software (C3640-IS-M), Version 12.4(10), RELEASE SOFTWARE (fc1)Techn
14、ical Support: http:/ (c) 1986-2006 by Cisco Systems, Inc.Compiled Wed 16-Aug-06 04:04 by prod_rel_teamadvertisement version: 2VTP Management Domain: R2#sh cdp entR2#sh cdp entry *-Device ID: R1Entry address(es): IP address: 192.168.1.1Platform: Cisco 3640, Capabilities: Router Switch IGMP Interface:
15、 Serial0/0, Port ID (outgoing port): Serial0/0Holdtime : 176 secVersion :Cisco IOS Software, 3600 Software (C3640-IS-M), Version 12.4(10), RELEASE SOFTWARE (fc1)Technical Support: http:/ (c) 1986-2006 by Cisco Systems, Inc.Compiled Wed 16-Aug-06 04:04 by prod_rel_teamadvertisement version: 2VTP Management Domain: Device ID 直连设备的主机名Local Interface 要接收 cdp 数据包的端口或接口Holdtime 如果没有接收到其他 CDP 数据包，路由器在丢弃接收到的信息之前将要保存的时间量。Capability 邻居设备的性能，如路由器、交换机或中继器。性能代码在命令中输出的顶端 列出Platfirm 直连的 Cisco 设备类型。Port ID 组播 cdp 数据包的相邻设备的端口或接口。
