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There is a bit more than just a few extra packets (as your cost) - BGP can/does have notable CPU impact on low-mid range routing gear.
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<div class="">With eBGP, you are talking propagation of your routes to the internet, so not all of the internet is going to see your changes for maybe up to 180 seconds. That said, it's likely most of it will be sooner than that.</div>
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<div class="">Tom<br class="">
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<div class="">On 27 Jan 2015, at 11:01 pm, Alex Samad - Yieldbroker <<a href="mailto:Alex.Samad@yieldbroker.com" class="">Alex.Samad@yieldbroker.com</a>> wrote:</div>
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<div class="">Hi<br class="">
<br class="">
Okay its eBGP, currently have 4 providers, some with multiple connections. So I am thinking 6 / 20 might be good for me, business requirement for approx. 30sec response.<br class="">
I am presuming all I am looking at is extra BGP packets .. every 6 sec compared to 1 min..<br class="">
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<br class="">
Alex<br class="">
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<blockquote type="cite" class="">-----Original Message-----<br class="">
From: David Hughes [<a href="mailto:david@hughes.com.au" class="">mailto:david@hughes.com.au</a>]<br class="">
Sent: Tuesday, 27 January 2015 9:37 PM<br class="">
To: Alex Samad - Yieldbroker<br class="">
Cc: <a href="mailto:ausnog@lists.ausnog.net" class="">ausnog@lists.ausnog.net</a><br class="">
Subject: Re: [AusNOG] BGP hold timer values<br class="">
<br class="">
<br class="">
I gave a lightning talk about this sort of thing a while ago at an APRICOT. I just<br class="">
googled to find the slides and can now see just how many years ago it was.<br class="">
Gotta say I'm feeling old :)<br class="">
<br class="">
But, it's probably still relevant although the defaults may have changed. This<br class="">
reflected what we were running at the time - and we were trying to be<br class="">
pretty aggressive.<br class="">
<br class="">
<span class="Apple-tab-span" style="white-space:pre"></span><a href="http://archive.apnic.net/meetings/21/docs/sigs/routing/routing-" class="">http://archive.apnic.net/meetings/21/docs/sigs/routing/routing-</a><br class="">
pres-hughes-bgp.pdf<br class="">
<br class="">
For reference I'm currently happy to run<br class="">
<br class="">
<span class="Apple-tab-span" style="white-space:pre"></span>eBGP<span class="Apple-tab-span" style="white-space:pre">
</span>: 10 / 30<br class="">
<span class="Apple-tab-span" style="white-space:pre"></span>iBGP<span class="Apple-tab-span" style="white-space:pre">
</span>: 5 / 15<br class="">
<br class="">
And I'd run this even to a single upstream. If it fails at least you'll have<br class="">
something in your logs to say why you fell off the net for a while. Silent<br class="">
failures are a bugger to troubleshoot.<br class="">
<br class="">
<br class="">
Thanks<br class="">
<br class="">
David<br class="">
...<br class="">
<br class="">
<br class="">
<br class="">
On 27/01/2015, at 6:47 PM, Alex Samad - Yieldbroker<br class="">
<Alex.Samad@yieldbroker.com> wrote:<br class="">
<br class="">
<blockquote type="cite" class="">Hi<br class="">
<br class="">
I'm wonder what is considered "best practice" or good/responsible hold<br class="">
</blockquote>
timer values for BGP.<br class="">
<blockquote type="cite" class=""><br class="">
Currently I'm set at 3m, but I am considering lowering this to 30s and keep<br class="">
</blockquote>
alive down to 20s, potentially even lower. Or if possible to use BFD & BGP,<br class="">
what's the uptake on BFD ?<br class="">
<blockquote type="cite" class=""><br class="">
Alex<br class="">
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</blockquote>
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