<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><br></div>”Someday we’ll find it: the stable connection, my providers, my routers and me.“ - Kermit the Frog<div><div><br></div><div><a href="https://networkphil.com/">https://networkphil.com/</a></div><div><br></div><div>Couldn’t resist- having read this and then almost immediately seeing a link to the above “Rainbow Connection” remix via a LinkedIn post. Happy Friday!</div><div><br></div><div>Cheers,</div><div>Yoni</div><div><div dir="ltr"><br><blockquote type="cite">On Nov 21, 2019, at 11:50 PM, Warren Kumari <warren@kumari.net> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><span>On Fri, Nov 22, 2019 at 12:40 PM Christopher Morrow</span><br><span><morrowc.lists@gmail.com> wrote:</span><br><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>On Fri, Nov 22, 2019 at 12:32 PM Baldur Norddahl</span><br></blockquote><blockquote type="cite"><span><baldur.norddahl@gmail.com> wrote:</span><br></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>On Fri, Nov 22, 2019 at 1:21 AM Christopher Morrow <morrowc.lists@gmail.com> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>On Fri, Nov 22, 2019 at 2:01 AM Saku Ytti <saku@ytti.fi> wrote:</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>On Thu, 21 Nov 2019 at 19:44, Baldur Norddahl <baldur.norddahl@gmail.com> wrote:</span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>A BGP reset can cause routing trouble for as much as 15 minutes. Since you have two sessions that mitigates the problem somewhat. But nevertheless this will not be acceptable.</span><br></blockquote></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>As there are best path algorithms which consider route age, BGP reset</span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>impact may be indefinite.</span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>fortunately we have a second actual provider... so this all isn't</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>super impacting to us, just weird and unexpected on my part.</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>No that is not helping. When the BGP session flaps your routes via that provider are withdrawn. Everyone out there that were using those routes will need to switch. But consider the following:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>ISP A has routes from both of your providers</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>ISP B has A as uplink</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>BGP works so that ISP A is only announcing the route that he is actually using to ISP B. ISP B therefore does not have both of your routes. When the active route is withdrawn ISP B will momentary be without any route to your network. It can take some time after the withdraw before ISP A announces that he now is using the alternative route. This gets worse with longer chains. Also some ISPs are using route flap limiting techniques that can prolong this process.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>As I said, my experience is that you can expect as much as 15 minutes of flaky internet after a BGP reset. This is with multiple transit providers.</span><br></blockquote></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Yup, I'm sensitive to flapping causing problems. This was why i</span><br></blockquote><blockquote type="cite"><span>started the thread, which really should have been:</span><br></blockquote><blockquote type="cite"><span> "Is there a well known bug people are working around? or is this a</span><br></blockquote><blockquote type="cite"><span>new problem I should chase with the provider? or 'nah, everyone does</span><br></blockquote><blockquote type="cite"><span>this, you just aren't normally paying attention'"</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I can not say too much about why you have BGP resets, but I can say that you really want it fixed. It will affect your connectivity.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>fortunately 3am local time is not prime-internet-use time :) phew!</span><br></blockquote><blockquote type="cite"><span>(not a great excuse though, of course)</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><span></span><br><span>The other saving grace / "meh" is that this is for a conference</span><br><span>network, and we are picking up sticks and leaving tomorrow... so, we</span><br><span>will let the provider know that there is something that should be</span><br><span>fixed, but a: our pain will have stopped :-P and b: we won't really</span><br><span>have a good way to know if they have fixed the issue (other than</span><br><span>perhaps watching for a spike of withdraws / reannouncements every 24</span><br><span>hours through this AS path)</span><br><span></span><br><span>W</span><br><span></span><br><blockquote type="cite"><span>I'll be chasing up the provider to see what's up.</span><br></blockquote><blockquote type="cite"><span>thanks!</span><br></blockquote><blockquote type="cite"><span>-chris</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><blockquote type="cite"><span>Regards,</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Baldur</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><span></span><br><span></span><br><span></span><br><span>-- </span><br><span>I don't think the execution is relevant when it was obviously a bad</span><br><span>idea in the first place.</span><br><span>This is like putting rabid weasels in your pants, and later expressing</span><br><span>regret at having chosen those particular rabid weasels and that pair</span><br><span>of pants.</span><br><span> ---maf</span><br></div></blockquote></div></div></body></html>