[NANOG] Re: question about peering relationships

["Forrest Christian (List Account) via NANOG" <nanog () lists nanog org>]

Yep. Pretty common, especially with regional providers who are both at a
peering exchange and who also buy transit.

Is particularly frustrating when AS C has configured their network to
prefer customer routes instead of peers which is also really common.

If I'm AS A and AS C is configured this way, my traffic will always go
through AS B even though I'm peered with AS C directly.


On Mon, Apr 7, 2025, 7:15 AM Sriram, Kotikalapudi (Fed) via NANOG <
nanog () lists nanog org> wrote:

> Does the following ever happen in reality? Do you think it is strange and
> unlikely?
>
> The lateral (i.e., non-transit) peer of an AS is also the transit provider
> of the AS's transit provider.  Example: AS A has AS B as a transit provider
> and AS C as a lateral peer, and AS C is a transit provider of AS B.
>
> Thank you.
>
> Sriram
>
>
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