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Here are the prefixes ESnet is getting from Stanford (AS32), via a direct 100G peering with CENIC (AS2152):

Wiki Markup
128.12.0.0/16      \*\[\] 7w1d 16:06:45, MED 10, localpref 4000,
from 134.55.200.146
AS path: 2153 32 I
> to 134.55.49.1 via xe-1/3/0.5
171.64.0.0/14      \*\[\] 7w1d 16:06:45, MED 10, localpref 4000,
from 134.55.200.146
AS path: 2153 32 I
> to 134.55.49.1 via xe-1/3/0.5

Wiki Markup
2607:f6d0::/32     \*\[\] 7w1d 16:07:51, MED 10, localpref 4000,
from 134.55.200.146
AS path: 2153 32 I
> to fe80::ea4:2ff:fe5b:3401 via xe-1/3/0.5

If you start preferring these routes from ESnet, we should end up with a
symmetric path from ANL to Stanford and back. That may not solve the
throughput issues, but it will give us a place to start troubleshooting.

Thanks also for the clarification on anlborder-ps. I'll run some more
tests today and send the results.

ANL reports the routes are symmetric, 11:15am 5/31/2013