Cisco Discovery Protocol
| Router#show cdp | Displays global CDP information (such as timers) |
| Router#show cdp neighbors | Displays information about neighbors |
| Router#show cdp neighbors detail | Displays more detail about neighbor device |
| Router#show cdp entry word | Displays information about device named word |
| Router#show cdp entry * | Displays information about all devices |
| Router#show cdp interface | Displays info about interfaces that have CDP running |
| Router#show cdp interface x | Displays info about specific interface x running CDP |
| Router#show cdp traffic | Displays traffic infopackets in/out/version |
| Router(config)#cdp holdtime x | Changes length of time to keep CDP packets |
| Router(config)#cdp timer x | Changes how often CDP updates are sent |
| Router(config)#cdp run | Enables CDP globally (on by default) |
| Router(config)#no cdp run | Turns off CDP globally |
| Router(config-if)#cdp enable | Enables CDP on a specific interface |
| Router(config-if)#no cdp enable | Turns off CDP on a specific interface |
| Router#clear cdp counters | Resets traffic counters to 0 |
| Router#clear cdp table | Deletes the CDP table |
| Router#debug cdp adjacency | Monitors CDP neighbor information |
| Router#debug cdp events | Monitors all CDP events |
| Router#debug cdp ip | Monitors CDP events specifically for IP |
| Router#debug cdp packets | Monitors CDP packet-related information |
Caution:
Although CDP is an excellent source of information to you the network administrator, is it a potential security risk if a hacker gains access to one of your systems. The information that you gain through CDP is also gained by the hacker.
After you have used CDP to gather your information in a production environment, turn it off to thwart any bad people from using it for no good.
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