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<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">4.2</font></b></td>
<td bgcolor="#336666"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
<td bgcolor="#336666" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">ISDN Configuration</font></strong></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">4.2.4</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%"><strong>
<font face="Arial" size="2" color="#FFFFFF">Troubleshooting the ISDN
configuration</font></strong></td>
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<font FACE="Arial" SIZE="2">
The following commands are used to debug and troubleshoot the ISDN
configuration:</font>
<font face="Arial" size="2">
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></font><ul>
<li><font FACE="Arial" SIZE="2">The </font>
<font FACE="Courier New" SIZE="2">
<b>debug isdn q921</b> </font>
<font FACE="Arial" SIZE="2">
command shows data link layer, or Layer 2, messages on the D channel
between the router and the ISDN switch. Use this command if the </font>
<font FACE="Courier New" SIZE="2">
<b>show
isdn status</b></font><font FACE="Arial" SIZE="2">
command does not show Layer 1 as ACTIVE and Layer 2 as MULTIPLE_FRAME_ESTABLISHED.</font></li>
<li>
<font FACE="Arial" SIZE="2">
The </font>
<font FACE="Courier New" SIZE="2">
<b>debug isdn q931</b></font><font FACE="Arial" SIZE="2">
command shows the exchange of call setup and teardown messages of
the Layer 3 ISDN connection.<br>
The </font>
<font FACE="Courier New" SIZE="2">
<b>debug ppp authentication</b></font><font FACE="Arial" SIZE="2">
command displays the PPP authentication protocol messages, including
Challenge Handshake Authentication Protocol (CHAP) packet exchanges
and Password Authentication Protocol (PAP) exchanges.</font></li>
<li>
<font FACE="Arial" SIZE="2">
The </font>
<font FACE="Courier New" SIZE="2">
<b>debug ppp negotiation</b></font><font FACE="Arial" SIZE="2">
command displays information on PPP traffic and exchanges while the
PPP components are negotiated. This includes LCP,
authentication, and NCP exchanges. A
successful PPP negotiation will first open the LCP state, then
authenticate, and finally negotiate NCP.</font></li>
<li>
<font FACE="Arial" SIZE="2">
The </font>
<font FACE="Courier New" SIZE="2">
<b>debug ppp error</b></font><font FACE="Arial" SIZE="2">
command displays protocol errors and error statistics associated
with PPP connection negotiation and operation. Use the </font>
<font FACE="Courier New" SIZE="2">
<b>debug ppp</b></font><font FACE="Arial" SIZE="2">
commands to troubleshoot a Layer 2 problem if the </font>
<font FACE="Courier New" SIZE="2">
<b>show isdn status</b></font><font FACE="Arial" SIZE="2">
command does not indicate an ISDN problem.</li>
</ul>
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<p><font color="#808080">
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<b>Web Links</b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>Troubleshooting ISDN BRI SPIDs<p>
<a target="_blank" href="http://www.cisco.com/en/US/tech/tk801/tk379/technologies_tech_note09186a0080093c44.shtml">
http://www.cisco.com/en/US/tech/
tk801/tk379/technologies_tech_ note09186a0080093c44.shtml</a></font></p>
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