CCNA Cisco Certified Network Associate Study Guide - FTP Server

350 Chapter 7 � Managing a Cisco Internetwork
Getting Port and Interface Information
The show cdp interface command (sh cdp inter for short) shows the
CDP status on router interfaces or switch ports.
As explained earlier, you can turn off CDP completely on a router by
using the no cdp run command. However, CDP can also be turned off per
interface with the no cdp enable command. You can enable a port with the
cdp enable command. All ports and interfaces default to cdp enable.
On a router, the show cdp interface command shows information
about each interface using CDP, including the encapsulation on the line, the
timer, and the holdtime for each interface. Here is an example of this command’s
output on a router:
Router#sh cdp interface
Ethernet0 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Serial0 is administratively down, line protocol is down
Encapsulation HDLC
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Serial1 is administratively down, line protocol is down
Encapsulation HDLC
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
To turn off CDP on one interface on a router, use the no cdp enable
command from interface configuration mode:
Router#config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int s0
Router(config-if)#no cdp enable
Router(config-if)#^Z
Verify the change with the show cdp interface command:
Router#sh cdp int
Ethernet0 is up, line protocol is up