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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I was referring to the BGP route selection rules. But as someone else pointed out, there are things like local pref that they can use, which falls within those rules…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> AusNOG [mailto:ausnog-bounces@lists.ausnog.net]
<b>On Behalf Of </b>McDonald Richards<br>
<b>Sent:</b> Friday, 12 January 2018 9:14 AM<br>
<b>To:</b> ausnog@lists.ausnog.net<br>
<b>Subject:</b> Re: [AusNOG] Megaport IX Sydney - Sudden grows in number of prefixes<o:p></o:p></span></p>
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<p class="MsoNormal">Pretty sure there are no rules....<o:p></o:p></p>
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<p class="MsoNormal">On Fri, Jan 12, 2018 at 9:08 AM, Philip Loenneker <<a href="mailto:Philip.Loenneker@tasmanet.com.au" target="_blank">Philip.Loenneker@tasmanet.com.au</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Traffic engineering is difficult when people don’t play by the rules…<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Perhaps using the HE community strings which Jacob suggested would be more helpful – you may be able to prevent HE advertising your subnets to TPG. Unless NSW-IX remove all community
strings when they go to peers….<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> AusNOG [mailto:<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">ausnog-bounces@lists.ausnog.net</a>]
<b>On Behalf Of </b>John Alexander<br>
<b>Sent:</b> Friday, 12 January 2018 9:04 AM<br>
<b>To:</b> <a href="mailto:ausnog@lists.ausnog.net" target="_blank">ausnog@lists.ausnog.net</a></span><o:p></o:p></p>
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<b>Subject:</b> Re: [AusNOG] Megaport IX Sydney - Sudden grows in number of prefixes<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p><span style="font-family:"Arial",sans-serif">I tried this, with 3:6939 which added 3 prepends to he (which I could see at HE's LG) but TPG still preferred to send traffic via he rather than transit, even though the path was longer...</span><o:p></o:p></p>
<p><span style="font-family:"Arial",sans-serif">ughhh</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On 01/12/2018 08:52 AM, Philip Loenneker wrote:<o:p></o:p></p>
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<pre>Note that you can also use BGP communities to adjust how the IX advertises your subnets to individual peers using the documentation here:<o:p></o:p></pre>
<pre><a href="https://www.ix.asn.au/peering-technical/" target="_blank">https://www.ix.asn.au/peering-technical/</a><o:p></o:p></pre>
<pre>Unfortunately you can't set a community of 0:7545 to avoid advertising your routes to TPG, as they aren't the direct peer - you would need to block advertising to HE using 0:6427. It may be sufficient for you to prepend the routes being advertised to HE, using 3:6427, to reduce the amount of traffic taking that path, but still keeping it available.<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>-----Original Message-----<o:p></o:p></pre>
<pre>From: AusNOG [<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">mailto:ausnog-bounces@lists.ausnog.net</a>] On Behalf Of Bill Walker<o:p></o:p></pre>
<pre>Sent: Friday, 12 January 2018 8:11 AM<o:p></o:p></pre>
<pre>To: John Alexander <a href="mailto:johna@wideband.net.au" target="_blank"><johna@wideband.net.au></a><o:p></o:p></pre>
<pre>Cc: <a href="mailto:ausnog@lists.ausnog.net" target="_blank">ausnog@lists.ausnog.net</a><o:p></o:p></pre>
<pre>Subject: Re: [AusNOG] Megaport IX Sydney - Sudden grows in number of prefixes<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>Filter based on the AS Path?<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>If the path is:<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>You <- 58941 <- 6427 <- 7545<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>You <- MegaIXSyd <- HE <- TPG<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>In the Cisco world, I would use<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>ip as-path access-list 10 deny ^58941_6427_7545$<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>(The ASN's here may not be exactly what is in use, you will need to check your received prefixes)<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>On 2018-01-12 09:46, John Alexander wrote:<o:p></o:p></pre>
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<pre>With this, does anyone know of a way of keeping HE routes, but <o:p></o:p></pre>
<pre>excluding a specific one, namely TPG 7545 which is a direct customer <o:p></o:p></pre>
<pre>of HE. Traffic from them goes from Syd -> LA -> Syd -> he peering -> <o:p></o:p></pre>
<pre>me. I'd prefer to just make them stay at home so to speak instead of <o:p></o:p></pre>
<pre>going around the world. We don't peer at Pipe which would be the only <o:p></o:p></pre>
<pre>other place to connect to tpg.<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>John<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>On 01/11/2018 05:55 PM, Nathan Le Nevez wrote:<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
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<pre>I assume it was Hurricane Electric...IPv6 routes are now at 21843 too<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>Nathan<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>-----Original Message-----<o:p></o:p></pre>
<pre>From: AusNOG [<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">mailto:ausnog-bounces@lists.ausnog.net</a>] On Behalf Of <o:p></o:p></pre>
<pre>Paul Holmanskikh<o:p></o:p></pre>
<pre>Sent: Thursday, 11 January 2018 5:00 PM<o:p></o:p></pre>
<pre>To: <a href="mailto:ausnog@lists.ausnog.net" target="_blank">ausnog@lists.ausnog.net</a><o:p></o:p></pre>
<pre>Subject: [AusNOG] Megaport IX Sydney - Sudden grows in number of <o:p></o:p></pre>
<pre>prefixes<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>G'day,<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>Number of prefixes we are receiving from Megaport IX in Sydeney <o:p></o:p></pre>
<pre>suddenly jumped to 40493.<o:p></o:p></pre>
<pre>At lest 100% grow. Any ideas what happened.<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>as_path count<o:p></o:p></pre>
<pre>36351 945<o:p></o:p></pre>
<pre>4739 909<o:p></o:p></pre>
<pre>9443 658<o:p></o:p></pre>
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