This seems like something to address with your Comcast contacts? What you're saying sounds right, but we have no knowledge of your contractual obligations. On Wed, May 14, 2025 at 11:09 AM Stephen Griffin via NANOG < nanog@lists.nanog.org> wrote:
So, I currently work for a university that offers Xfinity on Campus for our students. As part of that, we receive essentially peering.. with a twist... it is actually configured more like a normal customer.
We're required to send 7922:999, which is essentially 7922's no-export. However, 7922:888 (7922+customers), seems like the better choice, while still respecting the goal of not providing transit.
The former makes it such that 7922 doesn't advertise our prefixes to their BGP customers, which can lead to blackholes if their customer is default-free and their other provider(s) have an outage, or if the customer is doing link (but not provider) redundancy with BGP. It also means that billable traffic from xfinity customers to us is actually driven away from 7922, which would seem to not be in 7922's best interest (maybe folks no longer bill on usage?).
no-export and its ilk just seems like the wrong choice in nearly every case, but I thought I would check myself with the assembled.
Cheers, Stephen Griffin _______________________________________________ NANOG mailing list
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