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Chapter 7
Managing a Cisco Internetwork
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 com-
mand 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
Encapsulation ARPA
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
Router#
Notice in the output above that serial 0 is not listed in the router out-
put. When you perform a cdp enable on serial 0, it would then display in
the output.
CDP is your friend!
You can use CDP to help you draw out your network. It is easy and just takes
some of your time. However, all the routers must be Cisco routers, or this
won't work!
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