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The
debug ppp authentication
command displays the authentication
exchange sequence. Figure
 illustrates
the Left router output during CHAP authentication with the router on the
right when
debug ppp authentication
is enabled. With two-way authentication configured, each router
authenticates the other. Messages appear for both the authenticating
process and the process of being authenticated. Use the
debug ppp authentication
command to display the exchange sequence as it occurs.
Figure 
highlights router output for a two-way PAP authentication.
The
debug ppp
command is used to display information about the operation of PPP. The
no
form of this command disables debugging output.
Router#debug ppp
{authentication | packet |
negotiation | error | chap}
Router#no debug ppp {authentication | packet | negotiation | error | chap}
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Lab Activity
Lab Exercise: Troubleshooting PPP
Configuration
In this lab, the
student will configure
a serial
interface on the London and Paris routers and troubleshoot the
connection.
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Lab Activity
e-Lab Activity: Troubleshooting a Serial Interface
In this lab, the student will configure a serial
interface on the London and Paris routers then use show
commands to troubleshoot and connectivity issues.
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