Xfinity on Campus

[Stephen Griffin via NANOG <nanog () lists nanog org>]

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
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