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<title>Layer2 Protocol Tunneling</title>

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<h1>Layer2 Protocol Tunneling</h1>

<p><b>Port &gt; Configure &gt; Layer2 Protocol Tunneling</b></p>

<p>From this dialog box, you can specify Layer2 protocol tunneling settings for
the ports on this device. Tunneling allows separate local networks, connected through an ISP,
to be recognized as one VLAN. This is possible because packets are transported
by the ISP from one network to another, giving the impression that the two networks are
really one network. Tunneling is supported by the following Layer2 protocols: Cisco Discovery
Protocol (CDP), VLAN Trunk Protocol (VTP), and Spanning Tree Protocol (STP).</p>

<p><b>Note:</b> This dialog box only appears on interfaces that support tunneling.</p>

<p>This dialog box displays the following data:</p>

<ul class=whs1
	style="list-style: disc;"
	type=disc>
	
	<li class=kadov-P><p>	<a href="#CDP Tunneling">	CDP Tunneling (cltcTunneledProtocolType)</a></p></li>
	
	<li class=kadov-P><p>	<a href="#CDP Drop Threshold (PDUs/sec)">	CDP Drop Threshold
      (PDUs/sec) (cltcTunnelDropThreshold)</a></p></li>
	
	<li class=kadov-P><p>	<a href="#CDP Shutdown Threshold (PDUs/sec)">	CDP Shutdown Threshold
      (PDUs/sec) (cltcTunnelShutdownThreshold)</a></p></li>
	
	<li class=kadov-P><p>	<a href="#VTP Tunneling">	VTP Tunneling (cltcTunneledProtocolType)</a></p></li>
	
	<li class=kadov-P><p>	<a href="#VTP Drop Threshold (PDUs/sec)">	VTP Drop Threshold
      (PDUs/sec) (cltcTunnelDropThreshold)</a></p></li>
	
	<li class=kadov-P><p>	<a href="#VTP Shutdown Threshold (PDUs/sec)">	VTP Shutdown Threshold
      (PDUs/sec) (cltcTunnelShutdownThreshold)</a></p></li>
	
	<li class=kadov-P><p>	<a href="#STP Tunneling">	STP Tunneling (cltcTunneledProtocolType)</a></p></li>
	
	<li class=kadov-P><p>	<a href="#STP Drop Threshold (PDUs/sec)">	STP Drop Threshold
      (PDUs/sec) (cltcTunnelDropThreshold)</a></p></li>
	
	<li class=kadov-P><p>	<a href="#STP Shutdown Threshold (PDUs/sec)">	STP Shutdown Threshold
      (PDUs/sec) (cltcTunnelShutdownThreshold)</a></p></li>
	
	<li class=kadov-P><p>	<a href="#Drop Threshold (PDUs/sec)">	Drop Threshold
      (PDUs/sec) (cltcTunnelDropThreshold)</a></p></li>
	
	<li class=kadov-P><p>	<a href="#Shutdown Threshold (PDUs/sec)">	Shutdown Threshold
      (PDUs/sec) (cltcTunnelShutdownThreshold)</a></p></li>
	
</ul>

<p>The following list specifies buttons in this dialog box, as well as their
function:</p>
<ul>
  <li class="kadov-p">
    <p>Click <span style="font-weight: bold;">OK</span> to continue.</p>
  </li>
  <li class="kadov-p">
    <p>Click <span style="font-weight: bold;">Apply </span>to save the changes
    in the dialog box.</p>
  </li>
  <li class="kadov-p">
    <p>Click <span style="font-weight: bold;">Cancel</span> to close the dialog
    box.</p>
  </li>
  <li class="kadov-p">
    <p>Click <span style="font-weight: bold;">Refresh</span> to update the
    contents of the dialog box.</p>
  </li>
  <li class="kadov-p">
    <p>Click <span style="font-weight: bold;">Print</span> to print the contents
    of the dialog box.</p>
  </li>
  <li class="kadov-p">
    <p>Click <span style="font-weight: bold;">Help</span> to access online help.</p>
  </li>
</ul>


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<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p>	<b><a name="CDP Tunneling"></a>	CDP Tunneling (cltcTunneledProtocolType)</b></p>


<p>Indicates whether CDP PDU  tunneling mode is enabled.&nbsp;</p>


<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p>	<b><a name="CDP Drop Threshold (PDUs/sec)"></a>	CDP Drop Threshold (PDUs/sec) (cltcTunnelDropThreshold)</b></p>


<p>Indicates the drop threshold for tunneled CDP PDUs on an interface. After reaching this
value, the interface drops CPD PDUs. A value of &quot;0&quot; indicates that no limit is set.  This field
is disabled when CDP tunneling mode is disabled.</p>


<p><b>Note:</b> This field is only displayed on devices that support thresholds
on a per interface and per protocol basis.</p>


<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p>	<b><a name="CDP Shutdown Threshold (PDUs/sec)"></a>	CDP Shutdown Threshold (PDUs/sec) (cltcTunnelShutdownThreshold)</b></p>


<p>Indicates the shutdown threshold for tunneled CDP PDUs on an interface. After reaching this
value, the interface shuts down. A value of &quot;0&quot; indicates that no limit is set. This field
is disabled when CDP tunneling mode is disabled.</p>


<p><b>Note:</b> This field is only displayed on devices that support thresholds
on a per interface and per protocol basis.</p>


<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p>	<b><a name="VTP Tunneling"></a>	VTP Tunneling (cltcTunneledProtocolType)</b></p>


<p>Indicates whether VTP PDU  tunneling mode is enabled.</p>


<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p>	<b><a name="VTP Drop Threshold (PDUs/sec)"></a>	VTP Drop Threshold (PDUs/sec) (cltcTunnelDropThreshold)</b></p>


<p>Indicates the drop threshold for tunneled VTP PDUs on an interface. After reaching this
value, the interface drops VTP PDUs. A value of &quot;0&quot; indicates that no limit is set. This field
is disabled when VTP tunneling mode is disabled.</p>


<p><b>Note:</b> This field is only displayed on devices that support thresholds
on a per interface and per protocol basis.</p>


<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p>	<b><a name="VTP Shutdown Threshold (PDUs/sec)"></a>	VTP Shutdown Threshold (PDUs/sec) (cltcTunnelShutdownThreshold)</b></p>


<p>Indicates the shutdown threshold for tunneled VTP PDUs on an interface. After reaching this
value, the interface shuts down. A value of &quot;0&quot; indicates that no limit is set. This field
is disabled when VTP tunneling mode is disabled.</p>


<p><b>Note:</b> This field is only displayed on devices that support thresholds
on a per interface and per protocol basis.</p>


<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p>	<b><a name="STP Tunneling"></a>	STP Tunneling (cltcTunneledProtocolType)</b></p>


<p>Indicates whether STP PDU tunneling mode is enabled.&nbsp;</p>


<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p><b><a name="STP Drop Threshold (PDUs/sec)"></a>STP Drop Threshold (PDUs/sec) (cltcTunnelDropThreshold)</b></p>


<p>Indicates the drop threshold for tunneled STP PDUs on an interface. After reaching this
value, the interface drops STP PDUs. A value of &quot;0&quot; indicates that no limit is set. This field
is disabled when STP tunneling mode is disabled.</p>


<p><b>Note:</b> This field is only displayed on devices that support thresholds
on a per interface and per protocol basis.</p>


<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p>	<b><a name="STP Shutdown Threshold (PDUs/sec)"></a>	STP Shutdown Threshold (PDUs/sec) (cltcTunnelShutdownThreshold)</b></p>


<p>Indicates the shutdown threshold for tunneled STP PDUs on an interface. After reaching this
value, the interface shuts down. A value of &quot;0&quot; indicates that no limit is set. This field
is disabled when STP tunneling mode is disabled.</p>


<p><b>Note:</b> This field is only displayed on devices that support thresholds
on a per interface and per protocol basis.</p>


<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p>	<b><a name="Drop Threshold (PDUs/sec)"></a>	Drop Threshold (PDUs/sec) (cltcTunnelDropThreshold)</b></p>


<p>Indicates the drop threshold on an interface. After reaching this value, the interface
drops PDUs. A value of &quot;0&quot; indicates that no limit is set. This threshold
is applicable for all the three protocols.</p>


<p><b>Note:</b> This field is only displayed on devices that <i>do not </i> support thresholds
on a per interface and per protocol basis.</p>


<hr class=whs3
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p><b><a name="Shutdown Threshold (PDUs/sec)"></a>Shutdown Threshold (PDUs/sec) (cltcTunnelShutdownThreshold)</b></p>


<p>Indicates the shutdown threshold on an interface. After reaching this value, the interface
shuts down. A value of &quot;0&quot; indicates that no limit is set. This threshold
is applicable for all the three protocols.</p>


<p><b>Note:</b> This field is only displayed on devices that <i>do not </i> support thresholds
on a per interface and per protocol basis.</p>


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