HDLC PPP command reference sheet

 HDLC PPP command reference sheet

1.    Moves to interface configuration mode

Router(config)#interface serial

0/0/0

2.    Sets the encapsulation mode for this interface to HDLC

Router(config-if)#encapsulation

hdlc

3.    Moves to interface configuration mode

Router(config)#interface serial

0/0/0

4.    Changes encapsulation from default HDLC to PPP

Router(config-if)#encapsulation ppp

5.    Sets a username of R1 and a password of vinita for

authentication from the other side of the PPP serial link.

This is used by the local router to authenticate the PPP

peer

Router(config)#username R1 password vinita

6.    Moves to interface configuration mode.

Router(config)#interface serial

0/0/0

7.    Turns on Password Authentication Protocol (PAP)

authentication only

Router(config-if)#ppp authentication pap

8.    Turns on Challenge Handshake Authentication Protocol

(CHAP) authentication only.

Router(config-if)#ppp authentication chap

9.    Defines that the link will use PAP authentication, but will

try CHAP if PAP fails or is rejected by other side.

Router(config-if)#ppp

authentication pap chap

10    .Defines that the link will use CHAP authentication, but

will try PAP if CHAP fails or is rejected by other side.

Router(config-if)#ppp authentication chap pap

11.    This command must be set if using PAP in Cisco IOS

Software Release 11.1 or later

Router(config-if)#ppp pap sentusername R1 password vinita

12.    Lists information for serial interface x

Router#show interfaces serial x 

13.    Tells you what type of cable (DCE/DTE) is plugged into

your interface and whether a clock rate has been set

Router#show controllers serial x

14    Displays whether serial keepalive counters are

incrementing

Router#debug serial interface

15.    Displays any traffic related to PPP

Router#debug ppp 

16.    Displays PPP packets that are being sent and received

Router#debug ppp packet 

17.    Displays PPP packets related to the negotiation of the PPP

link

Router#debug ppp negotiation