home-assistant.github.io/components/sensor.snmp/index.html
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SNMP
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<p>The <code class="highlighter-rouge">snmp</code> sensor platform simple displays the information which are available through the <a href="https://en.wikipedia.org/wiki/Simple_Network_Management_Protocol">Simple Network Management Protocol (SNMP)</a>. SNMP uses a tree-like hierarchy where each node is an object.</p>
<p>To enable this sensor in your installation, add the following to your <code class="highlighter-rouge">configuration.yaml</code> file:</p>
<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yaml entry</span>
<span class="s">sensor</span><span class="pi">:</span>
<span class="pi">-</span> <span class="s">platform</span><span class="pi">:</span> <span class="s">snmp</span>
<span class="s">host</span><span class="pi">:</span> <span class="s">192.168.1.32</span>
<span class="s">baseoid</span><span class="pi">:</span> <span class="s">1.3.6.1.4.1.2021.10.1.3.1</span>
</code></pre>
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<p>Configuration variables:</p>
<ul>
<li><strong>host</strong> (<em>Required</em>): The IP address of your host, eg. <code class="highlighter-rouge">192.168.1.32</code>.</li>
<li><strong>port</strong> (<em>Option</em>): The SNMP port of your host. Defaults to <code class="highlighter-rouge">161</code>.</li>
<li><strong>name</strong> (<em>Optional</em>): Name of the SNMP sensor.</li>
<li><strong>community</strong> (<em>Optional</em>): The SNMP community which is set for the device. Most devices have a default community set to to <code class="highlighter-rouge">public</code> with read-only permission (which is sufficient).</li>
<li><strong>baseoid</strong> (<em>Required</em>): The OID where the information is located. Its advised to use the numerical notation.</li>
<li><strong>unit_of_measurement</strong> (<em>Optional</em>): Defines the unit of measurement of the sensor, if any.</li>
</ul>
<p>The OIDs may vary on different system because they are vendor-specific. Beside the devices manual is the <a href="http://www.oid-info.com/">OID Repository</a> a good place to start if you are looking for OIDs. The following OIDs are for the load of a Linux systems.</p>
<ul>
<li>1 minute Load: 1.3.6.1.4.1.2021.10.1.3.1</li>
<li>5 minute Load: 1.3.6.1.4.1.2021.10.1.3.2</li>
<li>15 minute Load: 1.3.6.1.4.1.2021.10.1.3.3</li>
</ul>
<p>There is a large amount of tools available to work with SNMP. <code class="highlighter-rouge">snmpwalk</code> let you easily retrieve the value of a OID.</p>
<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="gp">$ </span>snmpwalk -Os -c public -v 2c 192.168.1.32 1.3.6.1.4.1.2021.10.1.3.1
laLoad.1 <span class="o">=</span> STRING: 0.19
</code></pre>
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Introduced in release: 0.22
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