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<title>Global Configuration</title>

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<h1>Global Configuration</h1>

<p class=whs1
	style="font-weight: bold;">Device &gt; Configure &gt; Spanning Tree</p>

<p>Use this feature to set spanning tree parameters that enable the device's 
 learning bridge to dynamically halt loops in the network (by shutting 
 down selected bridge interfaces) before creating a spanning tree path.</p>

<p>The following data is displayed:</p>

<ul class=whs2
	style="list-style: disc;"
	type=disc>
	
	<li class=kadov-p><p><a href="#Spanning Tree Mode">Spanning Tree Mode (stpxSpanningTreeType)</a></p></li>
	
	<li class=kadov-p><p><a href="#Spanning Tree Path Cost Mode">Spanning Tree
      Path Cost Mode (stpxSpanningTreePathCostMode)</a></p></li>
	
	<li class=kadov-p><p><a href="#UplinkFast Mode">UplinkFast Mode
      (stpxUplinkFastEnabled)</a></p></li>
	
	<li class=kadov-p-Cwhs3><p class=whs3><a href="#UplinkFast Learning Rate">UplinkFast 
 Learning Rate (0..32000) (stpxUplinkStationLearningGenRate)</a></p></li>
	
	<li class=kadov-p-Cwhs4><p class=whs4><a href="#Backbone Fast">Backbone 
 Fast (stpxBackboneFastEnabled)</a></p></li>
	
	<li class=kadov-p-Cwhs5><p class=whs5><a href="#Fast Start BPDU Guard">Fast 
 Start BPDU Guard (stpxFastStartBpduGuardEnable)</a></p></li>
	
	<li class=kadov-p-Cwhs6><p class=whs6><a href="#Fast Start BPDU Filter">Fast 
 Start BPDU Filter (stpxFastStartBpduFilterEnable)</a></p></li>
	
	<li class=kadov-p><p><a href="#Fast Start Default Mode">Fast Start 
 Default Mode (stpxFastStartGlobalDefaultMode)</a></p></li>
	
	<li class=kadov-p><p><a href="#LoopGuard Default Mode">LoopGuard 
 Default Mode (stpxLoopGuardGlobalDefaultMode)</a></p></li>
	
	<li class=kadov-p><p><a href="#Mac Reduction Admin Status">Mac Reduction Admin Status
      (sysMacReductionAdminEnable)</a></p></li>
	
	<li class=kadov-p><p><a href="#Mac Reduction Oper Status">Mac Reduction Oper Status
      (sysMacReductionOperEnable)</a></p></li>
</ul>

<p>Do one of the following:</p>

<ul>
	
	<li class=kadov-p><p>Click <span style="font-weight: bold;"><b>OK</b></span> 
 to continue.</p></li>
	
	<li class=kadov-p><p>Click <span style="font-weight: bold;"><b>Apply 
 </b></span>to save the changes made in the dialog box.</p></li>
	
	<li class=kadov-p><p>Click <span style="font-weight: bold;"><b>Cancel</b></span> 
 to close the dialog box.</p></li>
	
	<li class=kadov-p><p>Click <span style="font-weight: bold;"><b>Refresh</b></span> 
 to update the contents of the dialog box.</p></li>
	
	<li class=kadov-p><p>Click <span style="font-weight: bold;"><b>Print</b></span> 
 to print the contents of the dialog box.</p></li>
	
	<li class=kadov-p><p>Click <span style="font-weight: bold;"><b>Help</b></span> 
 to access online help.</p></li>
</ul>


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<p class=whs8><a name="Spanning Tree Mode"></a><span style="font-weight: bold;">Spanning 
 Tree Mode (stpxSpanningTreeType)</span></p>

<p class=whs9>Actual mode the spanning tree protocol runs in on this device. 
 There are four modes:</p>

<ul class=whs10
	style="list-style: disc;"
	type=disc>
	
	<li class=kadov-p-Cwhs11><p class=whs11>PVST+ (Per VLAN Spanning Tree+ 
 Protocol)</p></li>
	
	<li class=kadov-p-Cwhs12><p class=whs12>MISTP (Multiple Instance Spanning 
 Tree Protocol)</p></li>
	
	<li class=kadov-p-Cwhs13><p class=whs13>MISTP–PVST+ (with the tunneling 
 scheme enabled)</p></li>
	
	<li class=kadov-p-Cwhs14><p class=whs14>MST (IEEE 802.1s Multiple Spanning 
 Tree)</p></li>
</ul>


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<p class=whs16><b><a name="Spanning Tree Path Cost Mode"></a>Spanning Tree Path
Cost Mode (stpxSpanningTreePathCostMode)</b></p>

<p>Indicates the spanning tree path cost mode configured on this device. This
mode applies to all instances of the spanning tree protocol running on the
device. When the value of this field is changed, the path cost of all ports is
reassigned to the default path cost value, which is based on the new spanning tree path
cost mode and the speed of the ports.</p>
<p>If the selected STP mode for the device is &quot;pvst+&quot;, the value of
this field can be changed between &quot;long&quot; and &quot;short&quot;. If the
selected STP mode for the device is &quot;mistp&quot;, &quot;mistp-pvst+&quot;, or
&quot;mst&quot;, the
default switch uses the long path cost.</p>
<p><b>Note:</b> When the value of this field is set to &quot;long&quot;, the path cost
you can specify
ranges from 1 to 268435456. When the value of this field is set to
&quot;short&quot;, the path cost you can specify ranges from 1 to 65545.</p>
<p>To set the path cost per port value:</p>
<ol>
  <li><p>Select <b> Port &gt; Configure &gt; Bridge</b>.</p></li>
  <li><p>Click <b>Bridge Details</b>.</p></li>
</ol>
<hr class=whs15
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p class=whs16><span style="font-weight: bold;"><a name="UplinkFast Mode"></a>UplinkFast Mode (stpxUplinkFastEnabled)</span></p>

<p>Displays whether STP UplinkFast is enabled on the device, as true or 
 false.</p>


<p><b>Note:</b> This field is not displayed when Spanning Tree Mode is set to
&quot;MST&quot;.</p>


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<p class=whs18><a name="UplinkFast Learning Rate"></a><span style="font-weight: bold;">UplinkFast 
 Learning Rate (0..32000) (stpxUplinkStationLearningGenRate)</span></p>

<p>Maximum number of station-learning frames that this device will generate 
 in each 100 millisecond period after an UplinkFast transition. The default 
 is 15.</p>


<p><b>Note:</b> This field is not displayed when Spanning Tree Mode is set to
&quot;MST&quot;.</p>


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<hr class=whs19
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p class=whs20><a name="Backbone Fast"></a><span style="font-weight: bold;">Backbone 
 Fast (stpxBackboneFastEnabled)</span></p>

<p>Indicates whether the BackboneFast capability is enabled on the device.</p>


<p><b>Note:</b> This field is displayed when Spanning Tree Mode is set to &quot;PVST+&quot;.</p>


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<p class=whs22><a name="Fast Start BPDU Guard"></a><span style="font-weight: bold;">Fast 
 Start BPDU Guard (stpxFastStartBpduGuardEnable)</span> </p>

<p class=whs23>Indicates whether BPDU Guard for Spanning Tree Port Fast 
 Start feature is enabled or not. </p>


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


<p class=whs25><a name="Fast Start BPDU Filter"></a><span style="font-weight: bold;">Fast 
 Start BPDU Filter (stpxFastStartBpduFilterEnable)</span> </p>

<p class=whs26>Indicates whether BPDU Filtering for Spanning Tree Port 
 Fast Start feature is enabled or not. </p>


<hr class=whs29
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p class=whs30><a name="Fast Start Default Mode"></a><span style="font-weight: bold;">Fast 
 Start Default Mode (stpxFastStartGlobalDefaultMode)</span></p>

<p>Indicates global default mode of Fast Start feature on the device.</p>

<hr class=whs27
	style="/*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ ">


<p class=whs28><span style="font-weight: bold;"><a name="LoopGuard Default Mode"></a>LoopGuard Default Mode (stpxLoopGuardGlobalDefaultMode)</span></p>

<p>Indicates global default configuration mode of LoopGuard feature on 
 the device.</p>


<hr>


<p><b><a name="Mac Reduction Admin Status"></a>Mac Reduction Admin Status (sysMacReductionAdminEnable)</b></p>
<p>
Indicates whether the Mac Reduction feature, which reduces the number of MAC
addresses used in bridge identifier, is administratively enabled on the device
or not.
<p>
<b>Note: </b>This object is only valid for Catalyst 6000 devices.</p>
<hr ALIGN="CENTER" WIDTH="100%" SIZE="2">
<p><b><a name="Mac Reduction Oper Status"></a>Mac Reduction Oper Status (sysMacReductionOperEnable)</b></p>
Indicates whether the Mac Reduction feature, which reduces the number of MAC
addresses used in bridge identifier, is operationaly enabled on the device or
not.
<p>
If the value of this object is true(1), the accepted values for dot1dStpPriority
in BRIDGE-MIB should be in multiples of 4096 plus the bridge instance ID (such
as VlanIndex). Changing this object value may cause the values of
dot1dBaseBridgeAddress and dot1dStpPriority, in BRIDGE-MIB, to be changed.
<p>
<b>Note: </b>This object is only valid for Catalyst 6000 devices.


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