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Christian Giese
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<section id="ospf">
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<span id="id1"></span><h1>OSPF<a class="headerlink" href="#ospf" title="Link to this heading"></a></h1>
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<p>OSPF (Open Shortest Path First) is a dynamic Interior Gateway Protocol (IGP)
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widely used in large computer networks. It efficiently determines the best paths
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for data transmission, adapting to network changes in real-time. OSPF’s link-state
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algorithm builds a detailed network map, optimizing data delivery and
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ensuring network stability.</p>
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<p>There are two versions of OSPF: OSPFv2 and OSPFv3. OSPFv2 is used for IPv4 networks,
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while OSPFv3 is designed specifically for IPv6 networks.</p>
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<p>The BNG Blaster can emulate multiple OSPF instances of both versions, OSPFv2 and OSPFv3
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(OSPFv3 is basically working but still under development).</p>
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<p>An OSPF instance is a virtual OSPF node with one or more network interfaces attached. Such a
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node behaves like a “real router” including database synchronization and flooding. Every
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instance generates a <code class="docutils literal notranslate"><span class="pre">self</span></code> originated type 1 router LSA describing the node itself.</p>
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<section id="configuration">
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<h2>Configuration<a class="headerlink" href="#configuration" title="Link to this heading"></a></h2>
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<p>Following an example OSPFv2 configuration with two instances
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attached to two network interfaces.</p>
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<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
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<span class="w"> </span><span class="nt">"interfaces"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="nt">"network"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
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<span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="nt">"interface"</span><span class="p">:</span><span class="w"> </span><span class="s2">"eth1"</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"address"</span><span class="p">:</span><span class="w"> </span><span class="s2">"10.0.1.2/30"</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"gateway"</span><span class="p">:</span><span class="w"> </span><span class="s2">"10.0.1.1"</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"ospfv2-instance-id"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"ospfv2-type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"p2p"</span><span class="p">,</span>
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<span class="w"> </span><span class="p">},</span>
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<span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="nt">"interface"</span><span class="p">:</span><span class="w"> </span><span class="s2">"eth2"</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"address"</span><span class="p">:</span><span class="w"> </span><span class="s2">"10.0.2.2/24"</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"gateway"</span><span class="p">:</span><span class="w"> </span><span class="s2">"10.0.2.1"</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"ospfv2-instance-id"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"ospfv2-type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"broadcast"</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="w"> </span><span class="p">]</span>
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<span class="w"> </span><span class="p">},</span>
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<span class="w"> </span><span class="nt">"ospf"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
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<span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="nt">"instance-id"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"version"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"router-id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"10.0.0.11"</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"hostname"</span><span class="p">:</span><span class="w"> </span><span class="s2">"R1"</span>
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<span class="w"> </span><span class="p">},</span>
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<span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="nt">"instance-id"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span>
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||
<span class="w"> </span><span class="nt">"version"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span>
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||
<span class="w"> </span><span class="nt">"router-id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"10.0.0.12"</span><span class="p">,</span>
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||
<span class="w"> </span><span class="nt">"hostname"</span><span class="p">:</span><span class="w"> </span><span class="s2">"R2"</span>
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||
<span class="w"> </span><span class="p">}</span>
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||
<span class="w"> </span><span class="p">]</span>
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||
<span class="p">}</span>
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</pre></div>
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</div>
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<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span><span class="w"> </span><span class="nt">"ospf"</span><span class="p">:</span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="p">}</span>
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</pre></div>
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</div>
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<table class="docutils align-default">
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<thead>
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<tr class="row-odd"><th class="head"><p>Attribute</p></th>
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<th class="head"><p>Description</p></th>
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</tr>
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</thead>
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<tbody>
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<tr class="row-even"><td><p><strong>instance-id</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF instance identifier.</div>
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</div>
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</td>
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</tr>
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<tr class="row-odd"><td><p><strong>version</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF version.</div>
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<div class="line">Default: 2</div>
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</div>
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</td>
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</tr>
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<tr class="row-even"><td><p><strong>auth-key</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF authentication key.</div>
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</div>
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</td>
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</tr>
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<tr class="row-odd"><td><p><strong>auth-type</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF authentication type (simple or md5).</div>
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</div>
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</td>
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</tr>
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<tr class="row-even"><td><p><strong>hello-interval</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF hello interval in seconds.</div>
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<div class="line">Default: 10 Range: 1 - 65535</div>
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</div>
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</td>
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</tr>
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<tr class="row-odd"><td><p><strong>dead-interval</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF dead interval in seconds.</div>
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<div class="line">Default: 40 Range: 1 - 65535</div>
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</div>
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</td>
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</tr>
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<tr class="row-even"><td><p><strong>lsa-retry-interval</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF LSA retry interval in seconds.</div>
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<div class="line">Default: 5 Range: 1 - 65535</div>
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</div>
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</td>
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</tr>
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<tr class="row-odd"><td><p><strong>hostname</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF hostname.</div>
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<div class="line">Default: bngblaster</div>
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</div>
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</td>
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</tr>
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<tr class="row-even"><td><p><strong>router-id</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF router identifier.</div>
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<div class="line">Default: 10.10.10.10</div>
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</div>
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</td>
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</tr>
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<tr class="row-odd"><td><p><strong>router-priority</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF router priority.</div>
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<div class="line">Default: 64 Range: 0 - 255</div>
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</div>
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</td>
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</tr>
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<tr class="row-even"><td><p><strong>area</strong></p></td>
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<td><div class="line-block">
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<div class="line">OSPF area.</div>
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||
<div class="line">Default: 0.0.0.0</div>
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||
</div>
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||
</td>
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||
</tr>
|
||
<tr class="row-odd"><td><p><strong>sr-base</strong></p></td>
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||
<td><div class="line-block">
|
||
<div class="line">OSPF SR base.</div>
|
||
<div class="line">Default: 0 Range: 0 - 1048575</div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
<tr class="row-even"><td><p><strong>sr-range</strong></p></td>
|
||
<td><div class="line-block">
|
||
<div class="line">OSPF SR range.</div>
|
||
<div class="line">Default: 0 Range: 0 - 1048575</div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p><strong>sr-node-sid</strong></p></td>
|
||
<td><div class="line-block">
|
||
<div class="line">OSPF SR node SID.</div>
|
||
<div class="line">Default: 0 Range: 0 - 1048575</div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
<tr class="row-even"><td><p><strong>teardown-time</strong></p></td>
|
||
<td><div class="line-block">
|
||
<div class="line">OSPF teardown time in seconds.</div>
|
||
<div class="line">Default: 5 Range: 0 - 65535</div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>The support for multiple instances allows different use cases. One example might
|
||
be to create two instances connected to the device or network under test. Now
|
||
inject an LSA on one instance and check if learned over the tested network on
|
||
the other instance.</p>
|
||
<p>Every OSPF instance can be also connected to an emulated link state graph loaded
|
||
by MRT files as shown in the example below.</p>
|
||
<img alt="OSPF" src="../_images/bbl_ospf.png" />
|
||
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"ospf"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
|
||
<span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"instance-id"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"version"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"router-id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"10.0.0.11"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"hostname"</span><span class="p">:</span><span class="w"> </span><span class="nt">"R1"</span>
|
||
<span class="w"> </span><span class="nt">"external"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"mrt-file"</span><span class="p">:</span><span class="w"> </span><span class="s2">"ospf.mrt"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"connections"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
|
||
<span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"router-id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"10.10.0.1"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"local-ipv4-address"</span><span class="p">:</span><span class="w"> </span><span class="s2">"10.0.0.1"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"metric"</span><span class="p">:</span><span class="w"> </span><span class="mi">1000</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="p">]</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="p">]</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span><span class="w"> </span><span class="nt">"ospf"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nt">"external"</span><span class="p">:</span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<table class="docutils align-default">
|
||
<thead>
|
||
<tr class="row-odd"><th class="head"><p>Attribute</p></th>
|
||
<th class="head"><p>Description</p></th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr class="row-even"><td><p><strong>purge</strong></p></td>
|
||
<td><div class="line-block">
|
||
<div class="line">Automatically purge all external LSA during teardown.</div>
|
||
<div class="line">Default: true</div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p><strong>mrt-file</strong></p></td>
|
||
<td><div class="line-block">
|
||
<div class="line">OSPF MRT file.</div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span><span class="w"> </span><span class="nt">"ospf"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nt">"external"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nt">"connections"</span><span class="p">:</span><span class="w"> </span><span class="p">[]</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<table class="docutils align-default">
|
||
<thead>
|
||
<tr class="row-odd"><th class="head"><p>Attribute</p></th>
|
||
<th class="head"><p>Description</p></th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr class="row-even"><td><p><strong>router-id</strong></p></td>
|
||
<td><div class="line-block">
|
||
<div class="line">Mandatory remote router identifier.</div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p><strong>metric</strong></p></td>
|
||
<td><div class="line-block">
|
||
<div class="line">Optional interface metric.</div>
|
||
<div class="line">Default: 10 Range: 0 - 4294967295</div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
<tr class="row-even"><td><p><strong>local-ipv4-address</strong></p></td>
|
||
<td><div class="line-block">
|
||
<div class="line">Mandatory local IPv4 address (OSPFv2 only).</div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
<tr class="row-odd"><td><p><strong>local-interface-id</strong></p></td>
|
||
<td><div class="line-block">
|
||
<div class="line">Local interface identifier (OSPFv3 only).</div>
|
||
<div class="line">Default: 1 (2, 3, …)</div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
<tr class="row-even"><td><p><strong>neighbor-interface-id</strong></p></td>
|
||
<td><div class="line-block">
|
||
<div class="line">Remote interface identifier (OSPFv3 only).</div>
|
||
<div class="line">Default: <cite>local-interface-id</cite></div>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</section>
|
||
<section id="interfaces">
|
||
<h2>Interfaces<a class="headerlink" href="#interfaces" title="Link to this heading"></a></h2>
|
||
<p>The BNG Blaster supports P2P and broadcast interfaces only.</p>
|
||
<p>The following command returns detailed informations about all
|
||
OSPF interfaces associated with the given OSPF instance (e.g. instance 1).</p>
|
||
<p><code class="docutils literal notranslate"><span class="pre">$</span> <span class="pre">sudo</span> <span class="pre">bngblaster-cli</span> <span class="pre">run.sock</span> <span class="pre">ospf-interfaces</span> <span class="pre">instance</span> <span class="pre">1</span></code></p>
|
||
</section>
|
||
<section id="neighbors">
|
||
<h2>Neighbors<a class="headerlink" href="#neighbors" title="Link to this heading"></a></h2>
|
||
<p>The following command returns detailed informations about all
|
||
OSPF neighbors associated with the given OSPF instance (e.g. instance 1).</p>
|
||
<p><code class="docutils literal notranslate"><span class="pre">$</span> <span class="pre">sudo</span> <span class="pre">bngblaster-cli</span> <span class="pre">run.sock</span> <span class="pre">ospf-neighbors</span> <span class="pre">instance</span> <span class="pre">1</span></code></p>
|
||
</section>
|
||
<section id="database">
|
||
<h2>Database<a class="headerlink" href="#database" title="Link to this heading"></a></h2>
|
||
<p>The BNG Blaster distinguishes between three different source types of
|
||
LSA entries in the OSPF database.</p>
|
||
<p>The type <code class="docutils literal notranslate"><span class="pre">self</span></code> is used for the self-originated LSA describing the own
|
||
BNG Blaster OSPF instance. LSP entries of type <code class="docutils literal notranslate"><span class="pre">adjacency</span></code> are learned
|
||
from OSPF neighbors. The type <code class="docutils literal notranslate"><span class="pre">external</span></code> is used for those LSA entries
|
||
learned via MRT files or injected via <code class="docutils literal notranslate"><span class="pre">ospf-lsa/pdu-update</span></code> <a class="reference internal" href="../api/index.html#api"><span class="std std-ref">command</span></a>.</p>
|
||
<p><code class="docutils literal notranslate"><span class="pre">$</span> <span class="pre">sudo</span> <span class="pre">bngblaster-cli</span> <span class="pre">run.sock</span> <span class="pre">ospf-database</span> <span class="pre">instance</span> <span class="pre">1</span></code></p>
|
||
<p>The BNG Blaster automatically purges all LSAs of type
|
||
<code class="docutils literal notranslate"><span class="pre">self</span></code> and <code class="docutils literal notranslate"><span class="pre">external</span></code> during teardown. This is done by
|
||
generating LSAs with newer sequence numbers and max age.</p>
|
||
</section>
|
||
<section id="flooding">
|
||
<h2>Flooding<a class="headerlink" href="#flooding" title="Link to this heading"></a></h2>
|
||
<p>The BNG Blaster floods LSAs received to all other active
|
||
neighbors of the OSPF instance except to those with neighbor
|
||
router-id equal to the source router-id of the LSA.</p>
|
||
</section>
|
||
<section id="lsa-update-command">
|
||
<h2>LSA Update Command<a class="headerlink" href="#lsa-update-command" title="Link to this heading"></a></h2>
|
||
<p>It is also possible to inject LSAs using the <code class="docutils literal notranslate"><span class="pre">ospf-lsa-update</span></code> <a class="reference internal" href="../api/index.html#api"><span class="std std-ref">command</span></a>.</p>
|
||
<p>This <a class="reference internal" href="../api/index.html#api"><span class="std std-ref">command</span></a> expects a list of hex encoded LSA including
|
||
the OSPF LSA common header (<code class="docutils literal notranslate"><span class="pre">|</span> <span class="pre">LS</span> <span class="pre">age</span> <span class="pre">|</span> <span class="pre">Options</span> <span class="pre">|</span> <span class="pre">LS</span> <span class="pre">type</span> <span class="pre">|</span></code>).</p>
|
||
<p><code class="docutils literal notranslate"><span class="pre">$</span> <span class="pre">cat</span> <span class="pre">command.json</span> <span class="pre">|</span> <span class="pre">jq</span> <span class="pre">.</span></code></p>
|
||
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"command"</span><span class="p">:</span><span class="w"> </span><span class="s2">"ospf-lsa-update"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"arguments"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"instance"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"lsa"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
|
||
<span class="w"> </span><span class="s2">"000100050ac801000aff010180000001e7790024ffffff00000000140000000000000000"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="s2">"000100050ac802000aff010180000001dc830024ffffff00000000140000000000000000"</span>
|
||
<span class="w"> </span><span class="p">]</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>The command <code class="docutils literal notranslate"><span class="pre">ospf-pdu-update</span></code> work similar to <code class="docutils literal notranslate"><span class="pre">ospf-lsa-update</span></code> expecting OSPF LS update
|
||
request PDU including OSPF common header (<code class="docutils literal notranslate"><span class="pre">|</span> <span class="pre">Version</span> <span class="pre">|</span> <span class="pre">Type</span> <span class="pre">|</span></code>).</p>
|
||
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"command"</span><span class="p">:</span><span class="w"> </span><span class="s2">"ospf-pdu-update"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"arguments"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"instance"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"pdu"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
|
||
<span class="w"> </span><span class="s2">"020400400101010100000000456e0000000000000000000000000001000100050ac80c000aff01018000012d13160024ffffff00000000140000000000000000"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="s2">"0204004001010101000000003b780000000000000000000000000001000100050ac80b000aff01018000012d1e0c0024ffffff00000000140000000000000000"</span>
|
||
<span class="w"> </span><span class="p">]</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
</section>
|
||
<section id="lsa-update-via-scapy">
|
||
<h2>LSA Update via Scapy<a class="headerlink" href="#lsa-update-via-scapy" title="Link to this heading"></a></h2>
|
||
<p>The following example shows how to generate LSAs via Scapy
|
||
and inject them using the ospf-lsa-update <a class="reference internal" href="../api/index.html#api"><span class="std std-ref">command</span></a>.</p>
|
||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">sys</span>
|
||
<span class="kn">import</span> <span class="nn">socket</span>
|
||
<span class="kn">import</span> <span class="nn">os</span>
|
||
<span class="kn">import</span> <span class="nn">json</span>
|
||
|
||
<span class="kn">from</span> <span class="nn">scapy.contrib.ospf</span> <span class="kn">import</span> <span class="o">*</span>
|
||
|
||
<span class="k">def</span> <span class="nf">error</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
|
||
<span class="w"> </span><span class="sd">"""print error and exit"""</span>
|
||
<span class="nb">print</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="n">file</span><span class="o">=</span><span class="n">sys</span><span class="o">.</span><span class="n">stderr</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
|
||
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
|
||
|
||
|
||
<span class="k">def</span> <span class="nf">execute_command</span><span class="p">(</span><span class="n">socket_path</span><span class="p">,</span> <span class="n">request</span><span class="p">):</span>
|
||
<span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">exists</span><span class="p">(</span><span class="n">socket_path</span><span class="p">):</span>
|
||
<span class="n">client</span> <span class="o">=</span> <span class="n">socket</span><span class="o">.</span><span class="n">socket</span><span class="p">(</span><span class="n">socket</span><span class="o">.</span><span class="n">AF_UNIX</span><span class="p">,</span> <span class="n">socket</span><span class="o">.</span><span class="n">SOCK_STREAM</span><span class="p">)</span>
|
||
<span class="k">try</span><span class="p">:</span>
|
||
<span class="n">client</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">socket_path</span><span class="p">)</span>
|
||
<span class="n">client</span><span class="o">.</span><span class="n">send</span><span class="p">(</span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">request</span><span class="p">)</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'utf-8'</span><span class="p">))</span>
|
||
<span class="n">data</span> <span class="o">=</span> <span class="s2">""</span>
|
||
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
|
||
<span class="n">junk</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">recv</span><span class="p">(</span><span class="mi">1024</span><span class="p">)</span>
|
||
<span class="k">if</span> <span class="n">junk</span><span class="p">:</span>
|
||
<span class="n">data</span> <span class="o">+=</span> <span class="n">junk</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s1">'utf-8'</span><span class="p">)</span>
|
||
<span class="k">else</span><span class="p">:</span>
|
||
<span class="k">break</span>
|
||
<span class="nb">print</span><span class="p">(</span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">data</span><span class="p">),</span> <span class="n">indent</span><span class="o">=</span><span class="mi">4</span><span class="p">))</span>
|
||
<span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
|
||
<span class="n">error</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
|
||
<span class="k">finally</span><span class="p">:</span>
|
||
<span class="n">client</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
|
||
<span class="k">else</span><span class="p">:</span>
|
||
<span class="n">error</span><span class="p">(</span><span class="s2">"socket </span><span class="si">%s</span><span class="s2"> not found"</span> <span class="o">%</span> <span class="n">socket_path</span><span class="p">)</span>
|
||
|
||
|
||
<span class="k">def</span> <span class="nf">main</span><span class="p">():</span>
|
||
<span class="w"> </span><span class="sd">"""main function"""</span>
|
||
<span class="n">socket_path</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
|
||
|
||
<span class="n">command</span> <span class="o">=</span> <span class="p">{</span>
|
||
<span class="s2">"command"</span><span class="p">:</span> <span class="s2">"ospf-lsa-update"</span><span class="p">,</span>
|
||
<span class="s2">"arguments"</span><span class="p">:</span> <span class="p">{</span>
|
||
<span class="s2">"instance"</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span>
|
||
<span class="s2">"lsa"</span><span class="p">:</span> <span class="p">[]</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="n">lsa</span> <span class="o">=</span> <span class="n">OSPF_External_LSA</span><span class="p">(</span><span class="nb">type</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="nb">id</span><span class="o">=</span><span class="s2">"10.200.1.0"</span><span class="p">,</span> <span class="n">adrouter</span><span class="o">=</span><span class="s2">"10.255.1.1"</span><span class="p">,</span> <span class="n">mask</span><span class="o">=</span><span class="s2">"255.255.255.0"</span><span class="p">,</span> <span class="n">seq</span><span class="o">=</span><span class="mi">2147483649</span><span class="p">)</span>
|
||
<span class="n">command</span><span class="p">[</span><span class="s2">"arguments"</span><span class="p">][</span><span class="s2">"lsa"</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">lsa</span><span class="o">.</span><span class="n">build</span><span class="p">()</span><span class="o">.</span><span class="n">hex</span><span class="p">())</span>
|
||
|
||
<span class="n">lsa</span> <span class="o">=</span> <span class="n">OSPF_External_LSA</span><span class="p">(</span><span class="nb">type</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="nb">id</span><span class="o">=</span><span class="s2">"10.200.2.0"</span><span class="p">,</span> <span class="n">adrouter</span><span class="o">=</span><span class="s2">"10.255.1.1"</span><span class="p">,</span> <span class="n">mask</span><span class="o">=</span><span class="s2">"255.255.255.0"</span><span class="p">,</span> <span class="n">seq</span><span class="o">=</span><span class="mi">2147483649</span><span class="p">)</span>
|
||
<span class="n">command</span><span class="p">[</span><span class="s2">"arguments"</span><span class="p">][</span><span class="s2">"lsa"</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">lsa</span><span class="o">.</span><span class="n">build</span><span class="p">()</span><span class="o">.</span><span class="n">hex</span><span class="p">())</span>
|
||
|
||
<span class="n">execute_command</span><span class="p">(</span><span class="n">socket_path</span><span class="p">,</span> <span class="n">command</span><span class="p">)</span>
|
||
|
||
|
||
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">"__main__"</span><span class="p">:</span>
|
||
<span class="n">main</span><span class="p">()</span>
|
||
</pre></div>
|
||
</div>
|
||
</section>
|
||
<section id="mrt-files">
|
||
<h2>MRT Files<a class="headerlink" href="#mrt-files" title="Link to this heading"></a></h2>
|
||
<p>The BNG Blaster can load LSA updates from a MRT file as defined in
|
||
<a class="reference external" href="https://datatracker.ietf.org/doc/html/rfc6396">RFC6396</a>.</p>
|
||
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>0 1 2 3
|
||
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| Timestamp |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| Type | Subtype |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| Length |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| Message... (variable)
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
</pre></div>
|
||
</div>
|
||
<p>The message field contains the complete OSPF LS Update PDU including
|
||
the OSPF common header starting with version field.</p>
|
||
<p>Those files can be loaded at startup via the configuration option
|
||
<code class="docutils literal notranslate"><span class="pre">"ospf":</span> <span class="pre">{</span> <span class="pre">"external":</span> <span class="pre">{</span> <span class="pre">"mrt-file":</span> <span class="pre">"<file>"</span> <span class="pre">}</span> <span class="pre">}</span></code> or alternative
|
||
via <code class="docutils literal notranslate"><span class="pre">ospf-load-mrt</span></code> <a class="reference internal" href="../api/index.html#api"><span class="std std-ref">command</span></a>.</p>
|
||
<p><code class="docutils literal notranslate"><span class="pre">$</span> <span class="pre">sudo</span> <span class="pre">bngblaster-cli</span> <span class="pre">run.sock</span> <span class="pre">ospf-load-mrt</span> <span class="pre">file</span> <span class="pre">ospf.mrt</span> <span class="pre">instance</span> <span class="pre">1</span></code></p>
|
||
<p>The following example shows how to generate such MRT file via Scapy.</p>
|
||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">struct</span>
|
||
<span class="kn">from</span> <span class="nn">scapy.contrib.ospf</span> <span class="kn">import</span> <span class="o">*</span>
|
||
|
||
<span class="k">def</span> <span class="nf">main</span><span class="p">():</span>
|
||
<span class="w"> </span><span class="sd">"""main function"""</span>
|
||
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s2">"ospf.mrt"</span><span class="p">,</span> <span class="s2">"wb"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
|
||
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">):</span>
|
||
<span class="n">lsa</span> <span class="o">=</span> <span class="n">OSPF_External_LSA</span><span class="p">(</span><span class="nb">type</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="nb">id</span><span class="o">=</span><span class="s2">"10.222.</span><span class="si">%s</span><span class="s2">.0"</span> <span class="o">%</span> <span class="n">i</span><span class="p">,</span> <span class="n">adrouter</span><span class="o">=</span><span class="s2">"10.255.1.1"</span><span class="p">,</span> <span class="n">mask</span><span class="o">=</span><span class="s2">"255.255.255.0"</span><span class="p">,</span> <span class="n">seq</span><span class="o">=</span><span class="mi">2147483949</span><span class="p">)</span>
|
||
<span class="n">ospf</span> <span class="o">=</span> <span class="n">OSPF_Hdr</span><span class="p">()</span><span class="o">/</span><span class="n">OSPF_LSUpd</span><span class="p">(</span><span class="n">lsacount</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span><span class="o">/</span><span class="n">lsa</span>
|
||
<span class="n">pdu</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s2">"!II"</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="o">+</span> <span class="n">ospf</span><span class="o">.</span><span class="n">build</span><span class="p">()</span>
|
||
<span class="n">mrt</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s2">"!IHHI"</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">11</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">pdu</span><span class="p">))</span> <span class="o">+</span> <span class="n">pdu</span>
|
||
<span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">mrt</span><span class="p">)</span>
|
||
|
||
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">"__main__"</span><span class="p">:</span>
|
||
<span class="n">main</span><span class="p">()</span>
|
||
</pre></div>
|
||
</div>
|
||
</section>
|
||
<section id="lspgen">
|
||
<h2>LSPGEN<a class="headerlink" href="#lspgen" title="Link to this heading"></a></h2>
|
||
<p>The BNG Blaster includes a tool called <a class="reference internal" href="lspgen.html#lspgen"><span class="std std-ref">lspgen</span></a>, which is able to generate
|
||
topologies and link state packets for export as MRT and PCAP files. This tool
|
||
is also able to inject LSAs directly using the <code class="docutils literal notranslate"><span class="pre">ospf-pdu-update</span></code>
|
||
<a class="reference internal" href="../api/index.html#api"><span class="std std-ref">command</span></a>.</p>
|
||
</section>
|
||
<section id="ospfv3">
|
||
<h2>OSPFv3<a class="headerlink" href="#ospfv3" title="Link to this heading"></a></h2>
|
||
<p>The BNG Blaster also provides support for OSPFv3, although it should be noted that
|
||
its support, compared to OSPFv2, is still considered experimental.</p>
|
||
<p>Conceptually, OSPFv2 and OSPFv3 function the same way in the BNG Blaster, and the
|
||
basic configuration differs only in the version number. The control commands are
|
||
also identical.</p>
|
||
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"interfaces"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"network"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
|
||
<span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"interface"</span><span class="p">:</span><span class="w"> </span><span class="s2">"eth1"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"address-ipv6"</span><span class="p">:</span><span class="w"> </span><span class="s2">"fc66:1337:60::2/64"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"gateway-ipv6"</span><span class="p">:</span><span class="w"> </span><span class="s2">"fc66:1337:60::1"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"ospfv3-instance-id"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"ospfv3-type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"p2p"</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="p">]</span>
|
||
<span class="w"> </span><span class="p">},</span>
|
||
<span class="w"> </span><span class="nt">"ospf"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
|
||
<span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="nt">"instance-id"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"version"</span><span class="p">:</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"router-id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"10.0.0.16"</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="nt">"hostname"</span><span class="p">:</span><span class="w"> </span><span class="s2">"R6"</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="p">]</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
</section>
|
||
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|
||
|
||
|
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