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|
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|
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|
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|
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|
||
<a href='/'>burble.dn42</a> / <a href='/network/'>Network</a> / Routing Policy
|
||
|
||
|
||
|
||
|
||
|
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</span>
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</div>
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|
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|
||
<article class="gdoc-markdown">
|
||
<h1>Routing Policy</h1>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<p>With a global network and multiple peers, the burble.dn42 network typically has many alternative route paths for reaching a particular destination. The routing policy aims to keep route selection sane, and avoid sending traffic outside of a region where possible.</p>
|
||
<div class="gdoc-page__anchorwrap"><h2 id="policy-objectives">Policy Objectives<a data-clipboard-text="http://localhost:2010/network/routing-policy/#policy-objectives" class="gdoc-page__anchor gdoc-page__anchor--right clip" aria-label="Anchor Policy Objectives" href="#policy-objectives"><svg class="icon link"><use xlink:href="#link"></use></svg></a></h2></div>
|
||
<ol>
|
||
<li>Direct routes for prefixes belonging to a peer should be given the highest priority.
|
||
<ul>
|
||
<li>So that traffic to peer networks is routed over the burble.dn42 network directly to the peer and not via an external 3rd party</li>
|
||
</ul>
|
||
</li>
|
||
<li>Where prefixes are tagged with a DN42 region, they should be routed locally or within the burble.dn42 network.
|
||
<ul>
|
||
<li>To avoid sending traffic across regions when this could have been avoided.</li>
|
||
<li>The AS path length is also increased between regions to pursuade external routers to also prefer local hosts.</li>
|
||
</ul>
|
||
</li>
|
||
<li>Prioritise by shortest path, then lowest latency</li>
|
||
</ol>
|
||
<div class="gdoc-page__anchorwrap"><h2 id="policy-implementation">Policy Implementation<a data-clipboard-text="http://localhost:2010/network/routing-policy/#policy-implementation" class="gdoc-page__anchor gdoc-page__anchor--right clip" aria-label="Anchor Policy Implementation" href="#policy-implementation"><svg class="icon link"><use xlink:href="#link"></use></svg></a></h2></div>
|
||
<div class="gdoc-page__anchorwrap"><h3 id="bgp-local_pref">bgp local_pref<a data-clipboard-text="http://localhost:2010/network/routing-policy/#bgp-local_pref" class="gdoc-page__anchor gdoc-page__anchor--right clip" aria-label="Anchor bgp local_pref" href="#bgp-local_pref"><svg class="icon link"><use xlink:href="#link"></use></svg></a></h3></div>
|
||
<p>The local_pref for routes is set on entry, and then propogated across the whole network. This forces the
|
||
network to prefer routes that, where possible, send traffic through the burble.dn42 network to a local peer,
|
||
rather than sending cross regional traffic through external peers (aka
|
||
<a href="https://en.wikipedia.org/wiki/Hot-potato_and_cold-potato_routing">Cold Potato Routing</a>).</p>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th style="text-align: left">Local Pref </th>
|
||
<th style="text-align: left">Route Class</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td style="text-align: left">3000 </td>
|
||
<td style="text-align: left">burble.dn42 dynamic / anycast routes</td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left">2000 </td>
|
||
<td style="text-align: left">burble.dn42 internal networks</td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left">1000 </td>
|
||
<td style="text-align: left">Peer networks (AS path len = 1)</td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left">500 </td>
|
||
<td style="text-align: left">Route received in same DN42 region as it originated</td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left">100 </td>
|
||
<td style="text-align: left">Default</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<div class="gdoc-page__anchorwrap"><h3 id="bgp-med">bgp med<a data-clipboard-text="http://localhost:2010/network/routing-policy/#bgp-med" class="gdoc-page__anchor gdoc-page__anchor--right clip" aria-label="Anchor bgp med" href="#bgp-med"><svg class="icon link"><use xlink:href="#link"></use></svg></a></h3></div>
|
||
<p>The med attribute is used to implement a latency based metric across the network. Scripts are used
|
||
to gather the latency between nodes (using ping) and this is then incorporated in to the ansible
|
||
scripting that generates the peer configuration for the internal mesh. The peer configuration
|
||
sets the med to be the latency in ms between nodes (in milliseconds * 10). A penalty of 500 is added
|
||
for each hop to encourange direct routing between nodes.</p>
|
||
<pre tabindex="0"><code>med = (latency between nodes in ms * 10) + (500 per hop)
|
||
</code></pre><p>The med metric is exported to external peers to help them decide how to route traffic to the burble.dn42
|
||
network.</p>
|
||
<div class="gdoc-page__anchorwrap"><h2 id="collectordn42">collector.dn42<a data-clipboard-text="http://localhost:2010/network/routing-policy/#collectordn42" class="gdoc-page__anchor gdoc-page__anchor--right clip" aria-label="Anchor collector.dn42" href="#collectordn42"><svg class="icon link"><use xlink:href="#link"></use></svg></a></h2></div>
|
||
<p>The global route collector is treated as a special case and does not follow the normal routing policy.
|
||
The objective of the collector policy is to steer traffic directly to fr-par1 and reduce transit of GRC
|
||
traffic over the burble.dn42 network. This is aggressively implemented for certain low bandwidth nodes
|
||
to prevent any GRC traffic going through these nodes.</p>
|
||
<p>To accomplish this, each node announces the GRC prefix in to DN42 with different levels of path prepending
|
||
depending on the available bandwidth of that node. Some nodes with low bandwidth allocations do not
|
||
announce the GRC prefix at all.</p>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th style="text-align: left">Node capability</th>
|
||
<th style="text-align: left">Action Taken</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td style="text-align: left">fr-par1</td>
|
||
<td style="text-align: left">Prefix announced without any prepending</td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left">Other nodes with unlimited BW allowance</td>
|
||
<td style="text-align: left">ASN prepended once</td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left">Nodes with BW limits</td>
|
||
<td style="text-align: left">ASN prepended twice</td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left">Nodes with low BW limits</td>
|
||
<td style="text-align: left">GRC prefix not announced</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>As well as the external traffic engineering, the internal mesh policy also prevents transit of GRC
|
||
traffic via low bandwidth nodes.</p>
|
||
|
||
|
||
</article>
|
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