Re: [Idr] Debugging accepted routes from BGP speakers
Jeff Tantsura <jefftant.ietf@gmail.com> Tue, 19 November 2019 05:41 UTC
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Date: Tue, 19 Nov 2019 13:41:18 +0800
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Job Snijders <job@instituut.net>, Robert Raszuk <robert@raszuk.net>, "Jakob Heitz (jheitz)" <jheitz@cisco.com>
Cc: IDR <idr@ietf.org>
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Subject: Re: [Idr] Debugging accepted routes from BGP speakers
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+1 Jakob Sometime ago, validating exactly that (across 4 vendors/6 OS's), I observed difference in behaviors across vendors and in 1 instance between different OS’s of the same vendor Cheers, Jeff On Nov 19, 2019, 1:19 PM +0800, Jakob Heitz (jheitz) <jheitz@cisco.com>, wrote: > In https://tools.ietf.org/html/rfc4271#section-9.1.2 > the AS loop is broken at the receiver. > Nowhere does it say that the sender must break the AS loop. > Split horizon filtering is a common practice, but nowhere > is it mandated. At least I could not find it. > > If the receiver of your route were to send you back its > best path, even if it's your route, then you have your > information. > > We could invent an address-family specific capability > to indicate that you wish your route to be echoed back. > > Regards, > Jakob. > > -----Original Message----- > From: Idr <idr-bounces@ietf.org> On Behalf Of Job Snijders > Sent: Monday, November 18, 2019 3:00 AM > To: Robert Raszuk <robert@raszuk.net> > Cc: IDR <idr@ietf.org> > Subject: Re: [Idr] Debugging accepted routes from BGP speakers > > On Mon, Nov 18, 2019 at 9:50 AM Robert Raszuk <robert@raszuk.net> wrote: > > > The latter one is oftentimes easily validated by Internet-wide looking glasses > > > > Hmmmm I must say that IMHO both latter and former could be addressed by looking-glass. In fact when I read this draft that was my first question - why not to just look at peer's looking glass ? > > Many networks unfortunately do not make BGP Looking Glasses available, > nor is there any standardized interface/method/design/approach for BGP > Looking Glasses. So solely relying on Looking Glasses for this > functionality has proven to be insufficient. > > > So perhaps we should simply issue a BCP to say that each AS should run a looking glass server holding all paths and declare victory ? And that could be all GROW WG thing too :) > > That is an interesting idea, but in my mind not the exclusive viable solution. > > > I already see a bunch of new things we could accomplish in the Internet if we would have those in place consistently everywhere - at least for each transit AS. > > Agreed - it would be a nicer world. Through the MANRS initiative I've > pitched the idea to provide more encouragement for networks to provide > looking glasses to the public, but arguably their availability is not > ubiquitous. > > Another observation is that in the "IP Transit Carrier" segment of the > market we see BGP Looking Glasses from time to time, but we rarely see > similar functionality offered by Cloud/CDN providers. Perhaps the > latter category is not interested in running & maintaining looking > glasses, or perhaps there are other constraints that prevent them from > exposing this information via suchs tools. My hope is that by creating > a feedback mechanism in BGP we create more opportunity to share > debugging information specific to EBGP sessions between different > orgs. > > Kind regards, > > Job > > _______________________________________________ > Idr mailing list > Idr@ietf.org > https://www.ietf.org/mailman/listinfo/idr > > _______________________________________________ > Idr mailing list > Idr@ietf.org > https://www.ietf.org/mailman/listinfo/idr
- [Idr] Debugging accepted routes from BGP speakers Jared Mauch
- Re: [Idr] Debugging accepted routes from BGP spea… Robert Raszuk
- Re: [Idr] Debugging accepted routes from BGP spea… Job Snijders
- Re: [Idr] Debugging accepted routes from BGP spea… Jared Mauch
- Re: [Idr] Debugging accepted routes from BGP spea… Robert Raszuk
- Re: [Idr] Debugging accepted routes from BGP spea… Jared Mauch
- Re: [Idr] Debugging accepted routes from BGP spea… Job Snijders
- Re: [Idr] Debugging accepted routes from BGP spea… Jakob Heitz (jheitz)
- Re: [Idr] Debugging accepted routes from BGP spea… Jeff Tantsura
- Re: [Idr] Debugging accepted routes from BGP spea… Zhuangshunwan
- Re: [Idr] Debugging accepted routes from BGP spea… Robert Raszuk
- Re: [Idr] Debugging accepted routes from BGP spea… Jakob Heitz (jheitz)
- Re: [Idr] Debugging accepted routes from BGP spea… Robert Raszuk
- Re: [Idr] Debugging accepted routes from BGP spea… Jeffrey Haas