D(ppt 41页).ppt

管理网络环境CICND(ppt 41页)
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
CDP
show cdp
CDP
CDP
用CDP发现直接相邻的设备
使用 CDP
交换机B
路由器A
路由器B
交换机A






S0
S1
RouterA#sh cdp ?
entry Information for specific neighbor entry
interface CDP interface status and configuration
neighbors CDP neighbor entries
traffic CDP statistics
<cr>
RouterA(config)#no cdp run
RouterA(config)#interface serial0
RouterA(config-if)#no cdp enable
交换机A同时也显示其Mac地址
使用show cdp neighbor 命令
RouterA#sh cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
RouterB Ser 0 148 R 2522 Ser 1
SwitchA0050BD855780 Eth 0 167 T S 1900 2






S0
S1
交换机B
路由器A
路由器B
交换机A
使用show cdp entry 命令
RouterA#sh cdp entry *
-------------------------
Device ID: RouterB
Entry address(es):
IP address:
Platform: cisco 2522, Capabilities: Router
Interface: Serial0, Port ID (outgoing port): Serial1
Holdtime : 168 sec
Version :
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-JS-L), Version (3), RELEASE SOFTWARE (fci)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Mon 08-Feb-99 18:18 by phanguye






S0
S1
交换机B
路由器A
路由器B
交换机A
其它CDP命令
RouterA#sh cdp traffic
CDP counters :
Packets output: 56, Input: 38
Hdr syntax: 0, Chksum error: 0, Encaps failed: 3
No memory: 0, Invalid packet: 0, Fragmented: 0
RouterA#sh cdp interface
BRI0 is administratively down, line protocol is down
Encapsulation HDLC
Sending CDP packets every 60 seconds
Holdtime is 180 seconds