Ccna routing and Switching Complete Study Guide

Encapsulation PPP, loopback not set

  Keepalive set (10 sec)

  

LCP REQsent

Closed: IPCP, CDPCP

The serial interface is up/down and LCP is sending requests but will never receive any 

responses because router Pod1R2 is using the HDLC encapsulation. To fix this problem, 

you would have to go to router Pod1R2 and configure the PPP encapsulation on the 

serial interface. One more thing: Even though the usernames are configured incorrectly, 

it doesn’t matter because the command 

ppp authentication chap

 isn’t used under the 

serial interface configuration. This means that the username command isn’t relevant in 

this example.

You can set a Cisco serial interface back to the default of HDLC with the 

no encapsulation

 

command like this:

Router(config)#

int s0/0

Router(config-if)#