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cold-potato at L3/Chi into UU?
In Chicago, L3 appears to be routing some traffic to UU directly, but for some other UU destinations, L3 is handing-off to UU via New York:
trace from L3/Chi to 188.8.131.52 (AS8015 via 701) is carried to UU via New York (edited):
1 ae-1-53.bbr1.Chicago1.Level3.net (184.108.40.206) 8 msec
Oddly, a L3/Chi trace to the last hop above within AS701 (220.127.116.11) enters UU immediately in Chicago, taking the shorter path to Minneapolis:
1 ge-7-0-0-56.edge1.Chicago1.Level3.net (18.104.22.168) 0 msec
UU support has verified that AS8015 prefixes are advertised at UU's L3/Chi peering point; and L3 support reports this is "routing as designed". I would guess that UU requires its peers to use hot-potato routing, so I'm at a loss as to what kind of traffic engineering is being used.
-- Bradley Urberg-Carlson VISI Network Operations; pgp keys avaialble at http://www.keyserver.net/