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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