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<li class="nav-item nav-item-this"><a href="">Combine multiple interfaces with network bonding</a></li>
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<section id="combine-multiple-interfaces-with-network-bonding">
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<span id="network-bonding"></span><h1>Combine multiple interfaces with network bonding<a class="headerlink" href="#combine-multiple-interfaces-with-network-bonding" title="Link to this heading">¶</a></h1>
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<p>This guide describes how to configure systemd to use the <strong class="command">bonding</strong>
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driver.</p>
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<p>Network bonding combines multiple network interfaces into a single logical
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interface to provide redundancy and bandwidth aggregation.</p>
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<p>Clear Linux* OS includes the Linux <a class="reference external" href="https://www.kernel.org/doc/Documentation/networking/bonding.txt">Bonding driver</a> and <a class="reference external" href="https://www.kernel.org/doc/Documentation/networking/team.txt">Team driver</a> .</p>
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<p>The example demonstrates how to:</p>
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<ul class="simple">
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<li><p>Bond all four ports of a quad-port NIC in 802.3ad mode.</p></li>
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<li><p>Enable jumbo frames to optimize large data transfers on the local network.</p></li>
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</ul>
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<p>Your NICs and network switch must support 802.3ad mode and jumbo frames. The
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example explains how to configure your NICs for both features. Your switch may
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require additional configuration. See your switch documentation for details.</p>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>You must run all commands in this guide as root.</p>
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</div>
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<ol class="arabic">
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<li><p>Log in and get root privileges.</p>
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<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">sudo -s</span>
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</pre></div>
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</div>
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</li>
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<li><p>Create the <code class="file docutils literal notranslate"><span class="pre">/etc/systemd/network</span></code> directory.</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>mkdir<span class="w"> </span>-p<span class="w"> </span>/etc/systemd/network
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</pre></div>
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</div>
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<p>The <code class="file docutils literal notranslate"><span class="pre">/etc/systemd/network</span></code> directory contains configuration files and
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network settings for the virtual device and its underlying physical
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interfaces.</p>
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</li>
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<li><p>Configure systemd to create a virtual network device called <cite>bond1</cite>. Use a
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text editor to create a file named <code class="file docutils literal notranslate"><span class="pre">30-bond1.netdev</span></code>.</p>
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<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">[NetDev]</span>
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<span class="go">Name=bond1</span>
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<span class="go">Kind=bond</span>
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<span class="go">[Bond]</span>
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<span class="go">Mode=802.3ad</span>
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<span class="go">TransmitHashPolicy=layer3+4</span>
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<span class="go">MIIMonitorSec=1s</span>
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<span class="go">LACPTransmitRate=fast</span>
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</pre></div>
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</div>
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<p>Refer to the <a class="reference external" href="https://www.freedesktop.org/software/systemd/man/systemd.netdev.html">systemd.netdev</a> manpage for <code class="file docutils literal notranslate"><span class="pre">30-bond1.netdev</span></code> file
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syntax. This example is based on Example 9 on the manpage. Modify the
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example for your configuration.</p>
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</li>
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<li><p>Configure the slave interfaces. Create a text file named
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<code class="file docutils literal notranslate"><span class="pre">30-bond1-enp1s0.network</span></code>. Assign the slave interfaces to the virtual
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<cite>bond1</cite> device and use the syntax shown in <a class="reference external" href="https://www.freedesktop.org/software/systemd/man/systemd.network.html">systemd.network</a>.</p>
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<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">[Match]</span>
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<span class="go">Name=enp1s0f*</span>
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<span class="go">[Network]</span>
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<span class="go">Bond=bond1</span>
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<span class="go">[Link]</span>
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<span class="go">MTUBytes=9000</span>
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</pre></div>
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</div>
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<p>The example bonds all four ports of a quad-port NIC as a slave of <cite>bond1</cite>.
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The example uses a wildcard match because the NIC names are in the range
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<cite>enp1s0f0-enp1s0f3</cite>. If your NIC names are not wildcard-compatible, create
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a separate <code class="file docutils literal notranslate"><span class="pre">.network</span></code> file for each NIC.</p>
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<p>For best results, do not assign addresses or DHCP support to the individual
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NICs.</p>
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<p>The <cite>MTUBytes</cite> setting enables jumbo frames of up to 9000 bytes. Your
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switch may require additional configuration to support this setting.</p>
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</li>
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<li><p>Configure the bonded interface in a file named <code class="file docutils literal notranslate"><span class="pre">30-bond1.network</span></code>.</p>
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<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">[Match]</span>
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<span class="go">Name=bond1</span>
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<span class="go">[Network]</span>
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<span class="go">BindCarrier=enp1s0f0 enp1s0f1 enp1s0f2 enp1s0f3</span>
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<span class="go">Address=192.168.1.201/24</span>
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<span class="go">[Link]</span>
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<span class="go">MTUBytes=9000</span>
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</pre></div>
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</div>
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<p><cite>bond1</cite> is a virtual interface with no physical link status.</p>
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<p><cite>BindCarrier</cite> indicates that the <cite>bond1</cite> link status is determined by the
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status of the listed slave devices.</p>
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<p><cite>Address</cite> contains an IP address that you assign to the logical interface.
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DHCP bonded interfaces are complex and outside the scope of this example.</p>
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<p><cite>MTUBytes</cite> must be set to 9000 on all slave interfaces and on the bonded
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interface for successful jumbo frames operation. If <cite>MTUBytes</cite> is not the
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same on all interfaces, then the lowest value is used.</p>
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</li>
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<li><p>Apply the new network configuration with the command:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>systemctl<span class="w"> </span>restart<span class="w"> </span>systemd-networkd
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</pre></div>
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</div>
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<p>The <cite>MTUBytes</cite> settings do not take effect until you reboot or manually
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apply the settings with a utility such as ifconfig.</p>
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</li>
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