* b...@herrin.us (William Herrin) [Tue 23 Jan 2024, 21:02 CET]:
On Tue, Jan 23, 2024 at 11:45 AM Owen DeLong via NANOG <nanog@nanog.org> wrote:
The catch to all of that, however, is that he’s not directly
peered with 3356 and many AS operators strip communities.
And even if I didn't, the problem isn't just one ISP localprefing to
prefer distant routes. Centurylink most directly impacts me, but as
others have pointed out: many ISPs do the same darn thing. The only
workable solution available to me appears to be tripling my presence
in the DFZ tables.
Why do you buy from ISPs when you don't want to receive traffic via
them?
Have you tried asking that upstream to interconnect more locally with
certain other networks?
Why do you buy from ISPs that strip TE communities from your
announcements that don't affect them in the first place?
Because big operators think it reasonable to localpref distance
routes ahead of nearby ones so long as the distant routes arrive
from customers. I'll remember that the next time folks complain
about the size of the routing table. This one you did to yourselves.
BGP, while a distance vector protocol, famously does not take
latency into account when making routing decisions.
-- Niels.
