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Introduction
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Network Calculator
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Network Monitoring
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Networking
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Networking
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Overview
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Common Settings
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Bridging
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Link Aggregation
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Ethernet Interfaces
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IP Addressing
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Routing
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Firewall Configuration
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Quality of Service
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RMON Counters
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Device Discovery
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DHCP Server
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NTP Server
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NTP Server
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Standalone Mode
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<article class="md-content__inner md-typeset">
<h1 id="ntp-server">NTP Server<a class="headerlink" href="#ntp-server" title="Permanent link"></a></h1>
<p>The NTP (Network Time Protocol) server provides accurate time synchronization
for network clients. It supports both standalone operation with a local
reference clock and hybrid mode where it synchronizes with upstream servers
while serving time to downstream clients.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The NTP server is mutually exclusive with the NTP client in system
configuration context.</p>
</div>
<h2 id="standalone-mode">Standalone Mode<a class="headerlink" href="#standalone-mode" title="Permanent link"></a></h2>
<p>Configure a standalone NTP server using only a local reference clock:</p>
<pre class="cli"><code>admin@example:/&gt; <b>configure</b>
admin@example:/config/&gt; <b>edit ntp</b>
admin@example:/config/ntp/&gt; <b>leave</b>
</code></pre>
<p>When setting up NTP via the CLI the system automatically configures a local
reference clock. The default <a href="#ntp-stratum-levels">stratum</a> is 16 (unsynchronized),
which is suitable for isolated networks. For production use, configure a specific
stratum level:</p>
<pre class="cli"><code>admin@example:/config/&gt; <b>edit ntp</b>
admin@example:/config/ntp/&gt; <b>set refclock-master master-stratum 10</b>
admin@example:/config/ntp/&gt; <b>leave</b>
</code></pre>
<h2 id="gps-reference-clock">GPS Reference Clock<a class="headerlink" href="#gps-reference-clock" title="Permanent link"></a></h2>
<p>A GPS/GNSS receiver can be used as an NTP reference clock source,
providing stratum 1 time derived from the GPS satellite constellation.
This requires a GPS hardware component to be configured first, see
<a href="../hardware/#gpsgnss-receivers">Hardware — GPS/GNSS Receivers</a>.</p>
<h3 id="basic-setup">Basic setup<a class="headerlink" href="#basic-setup" title="Permanent link"></a></h3>
<p>Add a GPS receiver as a reference clock source:</p>
<pre class="cli"><code>admin@example:/config/&gt; <b>edit ntp</b>
admin@example:/config/ntp/&gt; <b>edit refclock-master source gps0</b>
admin@example:/config/ntp/refclock-master/source/gps0/&gt; <b>set poll 2</b>
admin@example:/config/ntp/refclock-master/source/gps0/&gt; <b>set precision 0.1</b>
admin@example:/config/ntp/refclock-master/source/gps0/&gt; <b>end</b>
admin@example:/config/ntp/&gt; <b>leave</b>
</code></pre>
<p>Tunable parameters:</p>
<table>
<thead>
<tr>
<th>Parameter</th>
<th style="text-align: right;">Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>poll</code></td>
<td style="text-align: right;"><code>2</code></td>
<td>Polling interval in log2 seconds (2 = 4s)</td>
</tr>
<tr>
<td><code>precision</code></td>
<td style="text-align: right;"><code>0.1</code></td>
<td>Assumed precision in seconds (0.1 = 100ms)</td>
</tr>
<tr>
<td><code>refid</code></td>
<td style="text-align: right;"><code>"GPS"</code></td>
<td>Reference identifier (e.g., <code>GPS</code>, <code>GNSS</code>, <code>GLO</code>)</td>
</tr>
<tr>
<td><code>prefer</code></td>
<td style="text-align: right;"><code>false</code></td>
<td>Prefer this source over other reference clocks</td>
</tr>
<tr>
<td><code>pps</code></td>
<td style="text-align: right;"><code>false</code></td>
<td>Enable PPS for microsecond-level accuracy</td>
</tr>
<tr>
<td><code>offset</code></td>
<td style="text-align: right;"><code>0.0</code></td>
<td>Constant offset correction in seconds</td>
</tr>
<tr>
<td><code>delay</code></td>
<td style="text-align: right;"><code>0.0</code></td>
<td>Assumed maximum delay from the receiver</td>
</tr>
</tbody>
</table>
<h3 id="pps-pulse-per-second">PPS (Pulse Per Second)<a class="headerlink" href="#pps-pulse-per-second" title="Permanent link"></a></h3>
<p>When the GPS receiver provides a PPS signal, enable the <code>pps</code> option for
microsecond-level accuracy. With PPS, the GPS time provides the initial
lock and the PPS edges discipline the clock:</p>
<pre class="cli"><code>admin@example:/config/ntp/&gt; <b>edit refclock-master source gps0</b>
admin@example:/config/ntp/refclock-master/source/gps0/&gt; <b>set pps true</b>
admin@example:/config/ntp/refclock-master/source/gps0/&gt; <b>set precision 0.000001</b>
admin@example:/config/ntp/refclock-master/source/gps0/&gt; <b>end</b>
admin@example:/config/ntp/&gt; <b>leave</b>
</code></pre>
<h3 id="monitoring">Monitoring<a class="headerlink" href="#monitoring" title="Permanent link"></a></h3>
<p>The <code>show ntp</code> command shows the GPS receiver as the reference clock source:</p>
<pre class="cli"><code>admin@example:/&gt; <b>show ntp</b>
Mode : Server (GPS reference clock: gps0)
Port : 123
Stratum : 1
Ref time (UTC) : Sun Feb 08 19:44:36 2026
</code></pre>
<p>Use <code>show ntp source</code> to see GPS reference clock details:</p>
<pre class="cli"><code>admin@example:/&gt; <b>show ntp source</b>
Reference Clock : gps0 (u-blox)
Status : selected
Fix Mode : 3D
Satellites : 9/17 (used/visible)
</code></pre>
<h2 id="server-mode">Server Mode<a class="headerlink" href="#server-mode" title="Permanent link"></a></h2>
<p>Synchronize from upstream NTP servers while serving time to clients:</p>
<pre class="cli"><code>admin@example:/config/&gt; <b>edit ntp</b>
admin@example:/config/ntp/&gt; <b>edit unicast-configuration 0.pool.ntp.org type uc-server</b>
admin@example:/config/ntp/…/0.pool.ntp.org/type/uc-server/&gt; <b>set iburst true</b>
admin@example:/config/ntp/…/0.pool.ntp.org/type/uc-server/&gt; <b>end</b>
admin@example:/config/ntp/&gt; <b>edit unicast-configuration 1.pool.ntp.org type uc-server</b>
admin@example:/config/ntp/…/1.pool.ntp.org/type/uc-server/&gt; <b>set iburst true</b>
admin@example:/config/ntp/…/1.pool.ntp.org/type/uc-server/&gt; <b>end</b>
admin@example:/config/ntp/&gt; <b>leave</b>
</code></pre>
<p>The <code>unicast-configuration</code> uses a composite key with both address and type.
Both hostnames and IP addresses are supported. The <code>iburst</code> option enables
fast initial synchronization.</p>
<h2 id="peer-mode">Peer Mode<a class="headerlink" href="#peer-mode" title="Permanent link"></a></h2>
<p>In peer mode, two NTP servers synchronize with each other bidirectionally.
Each server acts as both client and server to the other:</p>
<p><strong>First peer:</strong></p>
<pre class="cli"><code>admin@peer1:/config/&gt; <b>edit ntp</b>
admin@peer1:/config/ntp/&gt; <b>edit unicast-configuration 192.168.1.2 type uc-peer</b>
admin@peer1:/config/ntp/…/192.168.1.2/type/uc-peer/&gt; <b>end</b>
admin@peer1:/config/ntp/&gt; <b>set refclock-master master-stratum 8</b>
admin@peer1:/config/ntp/&gt; <b>leave</b>
</code></pre>
<p><strong>Second peer:</strong></p>
<pre class="cli"><code>admin@peer2:/config/&gt; <b>edit ntp</b>
admin@peer2:/config/ntp/&gt; <b>edit unicast-configuration 192.168.1.1 type uc-peer</b>
admin@peer2:/config/ntp/…/192.168.1.1/type/uc-peer/&gt; <b>end</b>
admin@peer2:/config/ntp/&gt; <b>set refclock-master master-stratum 8</b>
admin@peer2:/config/ntp/&gt; <b>leave</b>
</code></pre>
<p>This configuration provides mutual synchronization between peers. If one peer
fails, the other continues to serve time to clients.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The <code>iburst</code> and <code>burst</code> options are not supported in peer mode.</p>
</div>
<h3 id="peer-selection-in-symmetric-mode">Peer Selection in Symmetric Mode<a class="headerlink" href="#peer-selection-in-symmetric-mode" title="Permanent link"></a></h3>
<p>When both peers have the same stratum (as in the example above where both are
stratum 8), NTP's clock selection algorithm uses the <strong>Reference ID</strong> as the
tie-breaker. The Reference ID is typically derived from the peer's IP address
when using a local reference clock.</p>
<p>This means the peer with the <strong>numerically lower IP address</strong> will be selected
as the sync source by the other peer. In the example above:</p>
<ul>
<li>peer1 (192.168.1.1) has a lower Reference ID</li>
<li>peer2 (192.168.1.2) will select peer1 as sync source</li>
</ul>
<p>This behavior is deterministic and ensures stable clock selection. If you need
a specific peer to be selected, configure it with a lower stratum level than
the other peer.</p>
<h2 id="timing-configuration">Timing Configuration<a class="headerlink" href="#timing-configuration" title="Permanent link"></a></h2>
<h3 id="poll-intervals">Poll Intervals<a class="headerlink" href="#poll-intervals" title="Permanent link"></a></h3>
<p>Control how often the NTP server polls upstream sources:</p>
<pre class="cli"><code>admin@example:/config/ntp/&gt; <b>edit unicast-configuration 0.pool.ntp.org type uc-server</b>
admin@example:/config/ntp/…/0.pool.ntp.org/type/uc-server/&gt; <b>set minpoll 4</b>
admin@example:/config/ntp/…/0.pool.ntp.org/type/uc-server/&gt; <b>set maxpoll 10</b>
admin@example:/config/ntp/…/0.pool.ntp.org/type/uc-server/&gt; <b>end</b>
</code></pre>
<p>Poll intervals are specified as powers of 2:
- <code>minpoll 4</code> = poll every 2^4 = 16 seconds (minimum polling rate)
- <code>maxpoll 10</code> = poll every 2^10 = 1024 seconds (maximum polling rate)
- Defaults: minpoll 6 (64 seconds), maxpoll 10 (1024 seconds)</p>
<p>Use shorter intervals (minpoll 2-4) for faster convergence in test environments
or peer configurations. Use defaults for production servers.</p>
<h3 id="fast-initial-synchronization">Fast Initial Synchronization<a class="headerlink" href="#fast-initial-synchronization" title="Permanent link"></a></h3>
<p>The <code>makestep</code> directive is automatically configured with safe defaults (1.0
seconds threshold, 3 updates limit) when creating an NTP server. This is
critical for embedded systems without RTC that boot with epoch time.</p>
<p>To customize the values:</p>
<pre class="cli"><code>admin@example:/config/ntp/&gt; <b>edit makestep</b>
admin@example:/config/ntp/makestep/&gt; <b>set threshold 2.0</b>
admin@example:/config/ntp/makestep/&gt; <b>set limit 1</b>
admin@example:/config/ntp/makestep/&gt; <b>end</b>
</code></pre>
<ul>
<li><strong>threshold</strong> - If clock offset exceeds this (in seconds), step immediately
instead of slewing slowly</li>
<li><strong>limit</strong> - Number of updates during which stepping is allowed. After this,
only gradual slewing is used for security</li>
</ul>
<p>With these defaults, a device booting at epoch time (1970-01-01) will sync to
correct time within seconds instead of hours.</p>
<h2 id="monitoring_1">Monitoring<a class="headerlink" href="#monitoring_1" title="Permanent link"></a></h2>
<p>For a quick overview:</p>
<p>To view the sources being used by the NTP client, run:</p>
<pre class="cli"><code>admin@example:/&gt; <b>show ntp</b>
Mode : Client
Stratum : 3
Ref time (UTC) : Sat Jan 24 23:41:42 2026
<span class="header">ADDRESS MODE STATE STRATUM POLL</span>
147.78.228.41 server outlier 2 64s
192.168.0.1 server unusable 0 128s
176.126.86.247 server selected 2 64s
</code></pre>
<p>Check NTP source status:</p>
<pre class="cli"><code>admin@example:/&gt; <b>show ntp source</b>
<span class="header">MS Name/IP address Stratum Poll Reach LastRx Last sample</span>
^+ 147.78.228.41 2 6 007 15 -431us +/- 33.573ms
^* 176.126.86.247 2 6 007 14 -389us +/- 4.307ms
</code></pre>
<p>For detailed information about a specific source:</p>
<pre class="cli"><code>admin@example:/&gt; <b>show ntp source 176.126.86.247</b>
Address : 176.126.86.247
Mode : Server (client mode) [^]
State : Selected sync source [*]
Configured : Yes
Stratum : 2
Poll interval : 7 (2^7 seconds = 128s)
Reachability : 377 (octal) = 11111111b
Last RX : 75s ago
Offset : +2.0us (+0.002000ms)
Delay : 4.270ms (0.004270s)
Dispersion : 205.0us (0.205000ms)
</code></pre>
<h2 id="ntp-stratum-levels">NTP Stratum Levels<a class="headerlink" href="#ntp-stratum-levels" title="Permanent link"></a></h2>
<p>NTP uses a hierarchical system called <strong>stratum</strong> to indicate distance from
authoritative time sources:</p>
<ul>
<li><strong>Stratum 0</strong>: Reference clocks (atomic clocks)</li>
<li><strong>Stratum 1</strong>: Servers directly connected to stratum 0 (e.g., GPS receivers)</li>
<li><strong>Stratum 2-15</strong>: Servers that sync from lower stratum (each hop adds one)</li>
<li><strong>Stratum 16</strong>: Unsynchronized (invalid)</li>
</ul>
<p>The default stratum (16) is not suitable for distributing time in isolated
networks, so when setting up an NTP server remember to adjust this value.
Use, e.g., <code>10</code>, this is a safe, low-priority value that ensures clients will
prefer upstream-synchronized servers (stratum 1-9) while still having a
fallback time source in isolated networks.</p>
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