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==Summary==

The Spanning Tree Protocol (STP) is a network protocol that builds a loop-free logical topology for Ethernet networks. The basic function of STP is to prevent bridge loops and the broadcast radiation that results from them. Spanning tree also allows a network design to include backup links providing fault tolerance if an active link fails.

==Spanning Tree Settings==

[[File:Networking tswos manual spanning tree.png|border|class=tlt-border]]

<table class="nd-mantable">
<tr>
<th>Field</th>
<th>Value</th>
<th>Description</th>
</tr>
<tr>
<td>Mode</td>
<td>Disabled | STP | RSTP; default: <b>Disabled</b></td>
<td> STP - provides a single path between any two end stations, avoiding and eliminating loops. RSTP - detects network topologies to provide faster convergence of the spanning tree. Disabled - turns off spanning tree protocol. </td>
</tr>
<tr>
<td>Priority</td>
<td>Integer [0..61440]; default: <b>32768</b></td>
<td>STP priority. The lower the number, the higher the priority. </td>
</tr>
<tr>
<td>Max age</td>
<td>Integer [6..40]; default: <b>20</b></td>
<td>Maximum expected arrival time of hello bridge protocol data units (BPDUs). </td>
</tr>
<tr>
<td>Forward delay</td>
<td>Integer [4..30]; default: <b>15</b></td>
<td>How long an STP bridge port remains in the listening and learning states before transitioning to the forwarding state.</td>
</tr>
<tr>
<td>Hello time</td>
<td>Integer [1..10]; default: <b>2</b></td>
<td>Number of seconds between transmissions of configuration BPDUs.</td>
</tr>
<tr>
<td>Hold count</td>
<td>Integer [1..10]; default: <b>6</b></td>
<td>The number or BPDUs that can be transmitted during every hello time period ranges from a minimum of one and a maximum of not more than defined value.</td>
</tr>
</table>




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