Command
PPP Authentication CHAP
Use
This command enables CHAP authentication on the PPP link.
Syntax
Router(config-if)#ppp authentication chap
Example
In this example, we will configure R1’s S1/1 inteface to authenticate R3 using CHAP.
R1(config)#int s1/1 R1(config-if)#encapsulation ppp R1(config-if)#ppp authentication chap R1(config-if)# *Mar 2 01:42:38.237: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1, changed state to down R1(config-if)#exit R1(config)#username R3 password cisco
R3(config-if)#int s1/1 R3(config-if)#encapsulation ppp R3(config-if)#ppp chap hostname R3 R3(config-if)#ppp chap password cisco R3(config-if)# *Mar 2 01:43:43.697: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1, changed state to up