📄 cdp_theory.htm
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<p><b><font size="4" color="#008000" face="Arial">Basic Lab Overview</font></b></p>
<p><font face="Arial">This lab is designed to introduce the Cisco Discovery
Protocol (CDP) and some of its available commands.</font></p>
<font face="Arial, Helvetica"><font face="Arial, Arial, Helvetica">
<h1><font color="#008000" size="4">The Cisco Discovery Protocol (CDP) Discovery Protocol</font></h1>
<p>CDP allows devices to share basic configuration information without even
configuring any protocol specific information and is enabled by default
on all interfaces.</p>
<p>CDP is a Datalink Protocol occurring at Layer 2 of the OSI model.
<br>
This is important to understand because CDP is not routable and can only
traverse to directly connected devices.</p>
<p>CDP allows you to view information such Operating System Version, Protocol
Information, and much more. <br>
This can be very handy for
troubleshooting a variety of problems.</p>
<p>CDP Configuration by default it is enabled on the router and all interfaces. <br>
The
commands are simple:</p>
<p><font color="#008000" size="4"><strong>Global Configuration Commands:</strong></font></p>
</font></font>
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<table borderColorDark="#999966" width="100%" borderColorLight="#cccc99" border="1">
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<td width="36%">no cdp run</td>
</font>
<td width="64%"><font face="Arial">turn off CDP for the entire router</font></td>
</tr>
<font face="Arial, Helvetica">
<font face="Terminal">
<font face="Terminal" size="2">
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<td width="36%">cdp run</td>
</font></font>
</font>
<td width="64%"><font face="Arial">(default) turn it on for the entire router</font></td>
</tr>
<font face="Terminal" size="2">
<tr>
<td width="36%">cdp timer 120</td>
</font>
<td width="64%"><font face="Arial">would change CDP to advertise every 120 seconds</font></td>
</tr>
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</table>
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<font face="Terminal">
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<p><font color="#008000" size="4"><strong>Interface Configuration Commands:</strong></font></p>
</font>
</font>
</font>
</font>
</font>
<font face="Terminal">
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<td width="35%" height="18">cdp enable</td>
</font>
<td width="65%" height="18"><font face="Arial">(default) turn it on for the interface</font></td>
</tr>
<font face="Arial, Arial, Helvetica">
<font face="Arial, Helvetica">
<font face="Terminal" size="2">
<tr>
<td width="35%" height="17">no cdp enable</td>
</font></font>
</font>
<td width="65%" height="17"><font face="Arial">turn it off for interface</font></td>
</tr>
</tbody>
</table>
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<font face="Arial, Helvetica"><font face="Arial, Arial, Helvetica">
<p><font color="#008000" size="4"><strong>Show Commands:</strong></font></p>
</font></font>
</font>
<font face="Terminal">
<table borderColorDark="#999966" width="100%" borderColorLight="#cccc99" border="1">
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<td width="35%">show cdp interface</td>
</font>
<td width="65%"><font face="Arial">view interface settings,</font></td>
</tr>
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<font face="Arial, Helvetica">
<font face="Terminal" size="2">
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<td width="35%">show cdp neighbor</td>
</font></font>
</font>
<td width="65%"><font face="Arial">view directly connected neighbors</font></td>
</tr>
<font face="Arial, Helvetica"><font face="Arial, Arial, Helvetica">
<font face="Arial, Arial, Helvetica">
<font face="Terminal" size="2">
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<td width="35%">show cdp neighbor detail</td>
</font>
</font>
</font>
</font>
<td width="65%"><font face="Arial">view detailed information about neighbors</font></td>
</tr>
<font face="Arial, Helvetica"><font face="Arial, Arial, Helvetica">
<font face="Arial, Arial, Helvetica">
<font face="Arial, Arial, Helvetica">
<font face="Terminal" size="2">
<tr>
<td width="35%">show cdp</td>
</font>
</font>
</font>
</font>
</font>
<td width="65%"><font face="Arial">general information</font></td>
</tr>
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</table>
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<font face="Arial, Helvetica"> </font></font></font></font></font></font></font>
<p><font face="Arial" size="2"><span class="724482219-24092001">Copyright (c)
1998-2003 Boson Software, Inc. All Rights Reserved.</span></font></p>
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