Verifying or Troubleshooting a Serial LinkPPP Encapsulation


Verifying or Troubleshooting a Serial Link/PPP Encapsulation

Router#show interfaces serial x

Lists info for serial interface x

Router#show controllers serial x

Tells you what type of cable (DCE/DTE) is plugged into your interface and whether a clock rate has been set

Router#debug serial interface

Displays whether serial keepalive counters are incrementing

Router#debug ppp

Displays any traffic related to PPP

Router#debug ppp packet

Displays PPP packets that are being sent and received

Router#debug ppp negotiation

Displays PPP packets related to the negotiation of the PPP link

Router#debug ppp error

Displays PPP error packets

Router#debug ppp authentication

Displays PPP packets related to the authentication of the PPP link

Router#debug ppp compression

Displays PPP packets related to the compression of packets across the link


Tip:

With frequent lab use, serial cable pins often get bent, which may prevent the router from seeing the cable. The output from the command show controllers interface serial x will show no cable even though a cable is physically present.





CCNA Self-Study(c) CCNA Portable Command Guide
CCNA Portable Command Guide
ISBN: 1587201585
EAN: 2147483647
Year: 2006
Pages: 261
Authors: Scott Empson

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