Re: [Sidrops] IXP Route Server question
Ben Maddison <benm@workonline.africa> Tue, 08 March 2022 21:39 UTC
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Date: Tue, 8 Mar 2022 23:39:07 +0200
From: Ben Maddison <benm@workonline.africa>
To: Christopher Morrow <christopher.morrow@gmail.com>
Cc: "Sriram,
Kotikalapudi (Fed)" <kotikalapudi.sriram=40nist.gov@dmarc.ietf.org>,
"grow@ietf.org" <grow@ietf.org>, "sidrops@ietf.org" <sidrops@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/sidrops/sAD8QVr32QIEVCuzczGX5zUx6ic>
Subject: Re: [Sidrops] IXP Route Server question
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On 03/08, Christopher Morrow wrote: > On Tue, Mar 8, 2022 at 2:36 PM Sriram, Kotikalapudi (Fed) > <kotikalapudi.sriram=40nist.gov@dmarc.ietf.org> wrote: > > > This question has relevance to the ASPA method for route leak detection. > > > > Is it possible that an ISP AS A peers with a customer AS C via a > > non-transparent IXP AS B? > > IOW, the AS path in routes propagated by the ISP A for customer C's > > prefixes looks like this: A B C. > > I.e., can the AS of a non-transparent IXP/RS appear in an AS path in the > > middle between an ISP and its customer? > > > > > it seems unlikely to me that an ISP would pick up a 'customer' (someone > that pays them to transport packets) at an IXP fabric. > Might it happen? sure? is it messy? yes! > I know of several transit providers that will allow customers to use an IXP as a kind of virtual access circuit (which itself is a poor idea), but I would be *very* surprised if any of them allow RS peerings to be the control plane interconnection (intentionally, at least). If the underlying question is "should the ASPA path validation algorithm have a corner case that accommodates this?", that is a very, very firm "no" from me! Cheers, Ben
- [Sidrops] IXP Route Server question Sriram, Kotikalapudi (Fed)
- Re: [Sidrops] IXP Route Server question Christopher Morrow
- Re: [Sidrops] [GROW] IXP Route Server question Christopher Morrow
- Re: [Sidrops] [GROW] IXP Route Server question Nick Hilliard
- Re: [Sidrops] [GROW] IXP Route Server question Robert Raszuk
- Re: [Sidrops] [GROW] IXP Route Server question Robert Raszuk
- Re: [Sidrops] [GROW] IXP Route Server question Christopher Morrow
- Re: [Sidrops] IXP Route Server question Ben Maddison
- Re: [Sidrops] IXP Route Server question Randy Bush
- Re: [Sidrops] IXP Route Server question Randy Bush
- Re: [Sidrops] [GROW] IXP Route Server question Sriram, Kotikalapudi (Fed)
- Re: [Sidrops] IXP Route Server question Sriram, Kotikalapudi (Fed)
- Re: [Sidrops] [GROW] IXP Route Server question Nick Hilliard
- Re: [Sidrops] [GROW] IXP Route Server question Ben Maddison
- Re: [Sidrops] [GROW] IXP Route Server question Sriram, Kotikalapudi (Fed)
- Re: [Sidrops] [GROW] IXP Route Server question Zhuangshunwan
- Re: [Sidrops] [GROW] IXP Route Server question Nick Hilliard
- Re: [Sidrops] [GROW] IXP Route Server question Randy Bush
- Re: [Sidrops] [GROW] IXP Route Server question Sriram, Kotikalapudi (Fed)
- Re: [Sidrops] [GROW] IXP Route Server question Sriram, Kotikalapudi (Fed)
- Re: [Sidrops] [GROW] IXP Route Server question Nick Hilliard
- Re: [Sidrops] [GROW] IXP Route Server question Zhuangshunwan
- Re: [Sidrops] [GROW] IXP Route Server question Mosher, Rob