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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Same – we poll all the major RR every 24 hours. Our scripts will automatically add or remove prefixes based on matching origin key
<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> routing-wg-bounces@ripe.net [mailto:routing-wg-bounces@ripe.net]
<b>On Behalf Of </b>Michael Hallgren<br>
<b>Sent:</b> Friday, November 21, 2014 9:25 AM<br>
<b>To:</b> routing-wg@ripe.net<br>
<b>Subject:</b> Re: [routing-wg] Who uses the RIPE IRR and for what?<o:p></o:p></span></p>
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Le 21/11/2014 10:08, Gert Doering a écrit :<br>
> Hi,<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> ><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > On Wed, Nov 19, 2014 at 06:31:56PM -0800, Ronald F. Guilmette<o:p></o:p></p>
<p class="MsoNormal"> wrote:<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> >> Of the remaining 235,061 route base IP addresses, fully<o:p></o:p></p>
<p class="MsoNormal"> 28,988 of<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> >> those (12.3%) are being announced by some AS other than<o:p></o:p></p>
<p class="MsoNormal"> the one<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> >> specified in the ripe.db.route file.<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> ><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > To state something that might be obvious or not - for the<o:p></o:p></p>
<p class="MsoNormal"> same prefix,<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > you can have multiple route: entries with different origin<o:p></o:p></p>
<p class="MsoNormal"> ASes, which<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > makes sense when a network moves (add new route: object,<o:p></o:p></p>
<p class="MsoNormal"> start new<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > announcement, eventually remove old route: object). So, some<o:p></o:p></p>
<p class="MsoNormal"> of these<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > might be perfectly fine, some might be forgotten (= a route:<o:p></o:p></p>
<p class="MsoNormal"> object with<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > the proper origin AS exists as well), and some might just be<o:p></o:p></p>
<p class="MsoNormal"> legacy<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > garbage - indeed.<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> ><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> >> Given the considerable number of routing anomalies<o:p></o:p></p>
<p class="MsoNormal"> revealed by my simple<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> >> experiment, I am inclined to wonder who is actually using<o:p></o:p></p>
<p class="MsoNormal"> all of that<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> >> route information in the RIPE DB, and what on earth they<o:p></o:p></p>
<p class="MsoNormal"> could be using<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> >> it for.<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> ><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > We use it to build BGP filters for BGP customers.<br>
<br>
So did I at previous employer's edge, for years and years.<br>
<br>
><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> ><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > For those, the filter is build using the origin AS as key, so<o:p></o:p></p>
<p class="MsoNormal"> if there are<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > additional route objects for the same prefix but with a<o:p></o:p></p>
<p class="MsoNormal"> different origin AS,<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > our script won't see them, so it's "garbage that does not<o:p></o:p></p>
<p class="MsoNormal"> disturb anything".<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> ><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > Of course, if the origin AS doesn't match at all, customers'<o:p></o:p></p>
<p class="MsoNormal"> BGP announcements<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > won't go out - and they usually notice that quickly and fix<o:p></o:p></p>
<p class="MsoNormal"> their stuff.<br>
<br>
Yes, voilà, same.<br>
<br>
><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> ><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > (Our upstream providers do the same thing for us, so it's<o:p></o:p></p>
<p class="MsoNormal"> used on a larger<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > scale - unfortunately, not all large transit providers do<o:p></o:p></p>
<p class="MsoNormal"> that, some just<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > take the money and look the other way)<br>
<br>
Right, shared view.<br>
<br>
Cheers,<br>
<br>
mh<br>
<br>
><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"> > Gert Doering<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"> > -- NetMaster<br>
<br>
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