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<img border="0" src="../../images/content_lines.gif" width="16" height="25">
<img border="0" src="../../images/transdot.gif" width="2" height="1"></td>
<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">3</font></b><font face="Arial" size="2" color="#FFFFFF"><b>.</b></font><b><font face="Arial" size="2" color="#FFFFFF">3</font></b></td>
<td bgcolor="#336666"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
<td bgcolor="#336666" width="100%">
<font size="2" color="#FFFFFF"><b><span style="font-family: Arial">
Configuring PPP</span></b></font></td>
<td width="9" bgcolor="#336666"> </td>
</tr>
<tr>
<td bgcolor="#669999" height="25" width="18"> </td>
<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">3.3.5</font></b></td>
<td bgcolor="#669999"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
<td bgcolor="#669999" height="25" width="100%"><b>
<font face="Arial" size="2" color="#FFFFFF">Troubleshooting the serial
encapsulation configuration</font></b></td>
<td bgcolor="#669999" height="25" width="9"> </td>
</tr></table>
<table border="0" cellpadding="0" cellspacing="0" width="95%" bordercolor="#111111">
<tr>
<td width="15"></td>
<td><font size="2" face="Arial">The
</font><font size="2" face="Courier New"><b>debug ppp authentication
</b>
</font><font size="2" face="Arial">command displays the authentication
exchange sequence. Figure
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"> illustrates
the Left router output during CHAP authentication with the router on the
right when
</font><font size="2" face="Courier New"><b>debug ppp authentication</b></font><font size="2" face="Arial">
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
</font><font size="2" face="Courier New"><b>debug ppp authentication</b></font><font size="2" face="Arial">
command to display the exchange sequence as it occurs.</font><p><font size="2" face="Arial">
Figure <img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12">
highlights router output for a two-way PAP authentication.
</font></p>
<p><font size="2" face="Arial">The
</font><font size="2" face="Courier New"><b>debug ppp</b></font><font size="2" face="Arial">
command is used to display information about the operation of PPP. The </font>
<b><font size="2" face="Courier New">no</font></b><font size="2" face="Arial">
form of this command disables debugging output.
<img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"></font></p>
<blockquote>
<p><font size="2" face="Courier New">Router#<b>debug ppp
{authentication | packet |
negotiation | error | chap}</b><br>
Router#<b>no debug ppp {authentication | packet | negotiation | error | chap}</b></font></p>
</blockquote>
<p>
<TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
<TR>
<TD valign="top">
<TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD width="5">
<img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
<TD>
<IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
<IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
</TR>
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<TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD>
<TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
<TR>
<TD bgcolor="#ffffff" width="15"> </TD>
<TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">
<a target="main" href="../lab3_3_5/index.html">
<img border="0" src="../../images/lab_icon.gif" width="25" height="25"> <b>
Lab Activity</b></a></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>Lab Exercise: <font face="Arial" size="2">Troubleshooting PPP
Configuration</font></p>
<p><font color="#808080" FACE="Arial" SIZE="2">In this lab, the
student will</font> configure
<span style="font-size: 10.0pt; font-family: Arial">a serial
interface on the London and Paris routers and troubleshoot the
connection.</span></p>
</font><font FACE="Arial" SIZE="2" COLOR="#000000">
<p></TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
<TABLE bgcolor="#669999" width="95%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD width="5">
<img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
<TD>
<IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
<IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="95%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD>
<TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
<TR>
<TD bgcolor="#ffffff" width="15"> </TD>
<TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">
<a href="javascript:void(0)" onClick="window.open('../../elabs/mod03/elab_3_3_5/elab3_3_5.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">
<img border="0" src="../../images/lab_icon.gif" width="25" height="25"><b></a>
<a href="javascript:void(0)" onClick="window.open('../../elabs/mod03/elab_3_3_5/elab3_3_5.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">Lab Activity</a></b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>e-Lab Activity: Troubleshooting a Serial Interface</p>
</font><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">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.</font></p>
<p></TD>
</TR>
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</TD>
</TR>
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