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<article class="md-content__inner md-typeset">
<h1 id="cli-introduction">CLI Introduction<a class="headerlink" href="#cli-introduction" title="Permanent link"></a></h1>
<p>The command line interface (CLI, see-ell-aye) implements a CISCO-like,
or Juniper Networks JunOS-like, CLI. It is the traditional way of
interacting with single network equipment like switches and routers.
Today more advanced graphical NETCONF-based tools are available that
allows for managing entire fleets of installed equipment.</p>
<p>Nevertheless, when it comes to initial deployment and debugging, it
is very useful to know how to navigate and use the CLI. This very
short guide intends to help you with that.</p>
<hr>
<p>New users usually get the CLI as the default "shell" when logging in,
but the default <code>admin</code> user logs in to <code>bash</code>. To access the CLI,
type:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>admin@host-12-34-56:~$ cli
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>See the 'help' command for an introduction to the system
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>admin@host-12-34-56:/&gt;
</code></pre></div>
<p>The prompt (beginning of the line) changes slightly. Key commands
available in any context are:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>admin@host-12-34-56:/&gt; help # Try: Tab or ?
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>...
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>admin@host-12-34-56:/&gt; show # Try: Tab or ?
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a>admin@host-12-34-56:/&gt; # Try: Tab or ?
</code></pre></div>
<hr>
<blockquote>
<p><strong>Note:</strong> even on an empty command line, you can tap the <code>Tab</code> or <code>?</code> keys.<br>
See <a href="../keybindings/"><code>help keybindings</code></a> for more tips!</p>
</blockquote>
<hr>
<h2 id="key-concepts">Key Concepts<a class="headerlink" href="#key-concepts" title="Permanent link"></a></h2>
<p>The two modes in the CLI are the admin-exec and the configure context.</p>
<p>The top-level context after logging in and starting the CLI is the
admin-exec or "main" context. It is used for querying system status,
managing configuration files/profiles and doing advanced debugging.</p>
<p>Available commands can be seen by pressing <code>?</code> at the prompt:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>admin@host:/&gt;
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a> configure Create new candidate-config based on running-config
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a> copy Copy file or configuration, e.g., copy running-config startup-config
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a> dir List available configuration files
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a> exit Exit from CLI (log out)
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a> factory-reset Restore the system to factory default state
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a> follow Monitor a log file, use Ctrl-C to abort
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a> help Help system (try also the '?' key)
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a> logout Alias to exit
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a> netcalc IP subnet calculator, with subnetting
<a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a> password Password tools
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a> ping Ping a network host or multicast group
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a> poweroff Poweroff system (system policy may yield reboot)
<a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a> reboot Reboot system
<a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a> remove Remove a configuration file
<a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a> set Set operations, e.g., current date/time
<a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a> show Show system status and configuration files
<a id="__codelineno-2-18" name="__codelineno-2-18" href="#__codelineno-2-18"></a> tcpdump Capture network traffic
<a id="__codelineno-2-19" name="__codelineno-2-19" href="#__codelineno-2-19"></a> upgrade Install a software update bundle from remote or local file
</code></pre></div>
<p>The system has three <em>main datastores</em> (or files): <em>factory</em>, <em>startup</em>,
and <em>running</em> that can be managed and inspected using the <code>copy</code>,
<code>show</code>, and <code>configure</code> commands. The traditional names used in the CLI
for these are listed below:</p>
<ul>
<li><code>factory-config</code> the default configuration from factory for the
device, i.e., what the system returns to after a <code>factory-reset</code></li>
<li><code>startup-config</code> created from <code>factory-config</code> at first boot after
factory reset. Loaded as the system configuration on each boot</li>
<li><code>running-config</code> what is actively running on the system. If no
changes have been made since boot, it is the same as <code>startup-config</code></li>
<li><code>candidate-config</code> is created from <code>running-config</code> when entering the
configure context. Any changes made here can be discarded (<code>abort</code>,
<code>rollback</code>) or committed (<code>commit</code>, <code>leave</code>) to <code>running-config</code></li>
</ul>
<p>Edit the <em>running</em> configuration using the <code>configure</code> command. This
copies <em>running</em> to <em>candidate</em>, a temporary datastore, where changes
are made:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>admin@host-12-34-56:/&gt; configure
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>admin@host-12-34-56:/config/&gt; ... # Try: Tab or ?
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>admin@host-12-34-56:/config/&gt; leave
</code></pre></div>
<p>The <code>leave</code> command activates the changes by issuing a transaction to,
essentially, copy the <em>candidate</em> back to <em>running</em>. Depending on the
changes made, this can take a few seconds. If the changes are invalid,
i.e., not correct according to the underlying YANG models, a warning is
shown and the session remains in configure context. Use the <code>abort</code>
command to cancel your changes, or investigate further with the <code>diff</code>
command (see more below).</p>
<p>To save configuration changes made to the <code>running-config</code> to persistent
store, so the system will use them for consecutive reboots, use the
<code>copy</code> command:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>admin@host-12-34-56:/&gt; copy running-config startup-config
</code></pre></div>
<p>In <em>configure context</em> the following commands are available:</p>
<table>
<thead>
<tr>
<th><strong>Command</strong></th>
<th><strong>Description</strong></th>
</tr>
</thead>
<tbody>
<tr>
<td><code>set foo bar val</code></td>
<td>Set <code>bar</code> leaf node in <code>foo</code> subcontext to <code>val</code></td>
</tr>
<tr>
<td><code>no foo bar</code></td>
<td>Clear/delete configuration made to <code>bar</code> in <code>foo</code></td>
</tr>
<tr>
<td><code>edit foo baz</code></td>
<td>Enter <code>baz</code> sub-sub-context in <code>foo</code> subcontext</td>
</tr>
<tr>
<td><code>change password</code></td>
<td>Start password dialogue to change a user's password</td>
</tr>
<tr>
<td><code>text-editor foo</code></td>
<td>Open a text editor to edit binary setting <code>foo</code></td>
</tr>
<tr>
<td><code>abort</code></td>
<td>Abort changes in configuration, return to admin-exec</td>
</tr>
<tr>
<td><code>exit</code></td>
<td>Exit one level sub-context, or abort from top-level</td>
</tr>
<tr>
<td><code>leave</code></td>
<td>Save changes to <code>running-config</code>, return to admin-exec</td>
</tr>
<tr>
<td><code>show [foo]</code></td>
<td>Show configured values (optionally in subcontext)</td>
</tr>
<tr>
<td><code>diff [foo]</code></td>
<td>Show uncommitted changes in candidate</td>
</tr>
<tr>
<td><code>do command</code></td>
<td>Call admin-exec command: <code>do show log</code></td>
</tr>
<tr>
<td><code>commit</code></td>
<td></td>
</tr>
</tbody>
</table>
<h2 id="example-session">Example Session<a class="headerlink" href="#example-session" title="Permanent link"></a></h2>
<hr>
<blockquote>
<p>Remember to use the <code>TAB</code> and <code>?</code> keys to speed up your navigation.<br>
See <a href="../keybindings/"><code>help keybindings</code></a> for more tips!</p>
</blockquote>
<hr>
<p>In this example we enter configure context to add an IPv4 address to
interface <code>eth0</code>, then we apply the changes using the <code>leave</code> command.</p>
<p>We inspect the system status to ensure the change took effect. Then we
save the changes for the next reboot.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a>admin@host-12-34-56:/&gt; configure
<a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a>admin@host-12-34-56:/config/&gt; edit interface eth0
<a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a>admin@host-12-34-56:/config/interface/eth0/&gt; set ipv4 &lt;TAB&gt;
<a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a> address autoconf bind-ni-name enabled
<a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a> forwarding mtu neighbor
<a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a>admin@host-12-34-56:/config/interface/eth0/&gt; set ipv4 address 192.168.2.200 prefix-length 24
<a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a>admin@host-12-34-56:/config/interface/eth0/&gt; show
<a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a>type ethernetCsmacd;
<a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a>ipv4 address 192.168.2.200 prefix-length 24;
<a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codelineno-5-10"></a>ipv6 enabled true;
<a id="__codelineno-5-11" name="__codelineno-5-11" href="#__codelineno-5-11"></a>admin@host-12-34-56:/config/interface/eth0/&gt; diff
<a id="__codelineno-5-12" name="__codelineno-5-12" href="#__codelineno-5-12"></a>interfaces {
<a id="__codelineno-5-13" name="__codelineno-5-13" href="#__codelineno-5-13"></a> interface eth0 {
<a id="__codelineno-5-14" name="__codelineno-5-14" href="#__codelineno-5-14"></a>+ ipv4 {
<a id="__codelineno-5-15" name="__codelineno-5-15" href="#__codelineno-5-15"></a>+ address 192.168.2.200 {
<a id="__codelineno-5-16" name="__codelineno-5-16" href="#__codelineno-5-16"></a>+ prefix-length 24;
<a id="__codelineno-5-17" name="__codelineno-5-17" href="#__codelineno-5-17"></a>+ }
<a id="__codelineno-5-18" name="__codelineno-5-18" href="#__codelineno-5-18"></a>+ }
<a id="__codelineno-5-19" name="__codelineno-5-19" href="#__codelineno-5-19"></a> }
<a id="__codelineno-5-20" name="__codelineno-5-20" href="#__codelineno-5-20"></a>}
<a id="__codelineno-5-21" name="__codelineno-5-21" href="#__codelineno-5-21"></a>admin@host-12-34-56:/config/interface/eth0/&gt; leave
<a id="__codelineno-5-22" name="__codelineno-5-22" href="#__codelineno-5-22"></a>admin@host-12-34-56:/&gt; show interfaces
<a id="__codelineno-5-23" name="__codelineno-5-23" href="#__codelineno-5-23"></a>INTERFACE PROTOCOL STATE DATA
<a id="__codelineno-5-24" name="__codelineno-5-24" href="#__codelineno-5-24"></a>lo loopback UNKNOWN 00:00:00:00:00:00
<a id="__codelineno-5-25" name="__codelineno-5-25" href="#__codelineno-5-25"></a> ipv4 127.0.0.1/8 (static)
<a id="__codelineno-5-26" name="__codelineno-5-26" href="#__codelineno-5-26"></a> ipv6 ::1/128 (static)
<a id="__codelineno-5-27" name="__codelineno-5-27" href="#__codelineno-5-27"></a>eth0 ethernet UP 52:54:00:12:34:56
<a id="__codelineno-5-28" name="__codelineno-5-28" href="#__codelineno-5-28"></a> ipv4 192.168.2.200/24 (static)
<a id="__codelineno-5-29" name="__codelineno-5-29" href="#__codelineno-5-29"></a> ipv6 fe80::5054:ff:fe12:3456/64 (link-layer)
<a id="__codelineno-5-30" name="__codelineno-5-30" href="#__codelineno-5-30"></a>admin@host-12-34-56:/&gt; show ip brief
<a id="__codelineno-5-31" name="__codelineno-5-31" href="#__codelineno-5-31"></a>lo UNKNOWN 127.0.0.1/8 ::1/128
<a id="__codelineno-5-32" name="__codelineno-5-32" href="#__codelineno-5-32"></a>eth0 UP 192.168.2.200/24 fe80::5054:ff:fe12:3456/64
<a id="__codelineno-5-33" name="__codelineno-5-33" href="#__codelineno-5-33"></a>admin@host-12-34-56:/&gt; copy running-config startup-config
</code></pre></div>
<p>One of the ideas behind a separate running and startup configuration is
to be able to verify a configuration change. In case of an inadvertent
change that, e.g., breaks networking, it is trivial to revert back by:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a>admin@host-12-34-56:/&gt; copy startup-config running-config
</code></pre></div>
<p>Or restart the device, for example if the change to the configuration
caused you to lose contact with the system (it happens to the best of
us). The system will start up from the last "save gave".</p>
<blockquote>
<p><strong>Tip:</strong> when restoring a backup of a configuration, or having manually
edited a config file, you can validate it using system's YANG models,
it is <em>not</em> applied if validation is successful:</p>
<p><code>copy /media/backup/old.cfg running-config validate</code></p>
</blockquote>
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