Sites unreachable while traversing Dallas IXP

[Andy Cole via NANOG <nanog () lists nanog org>]

Group,
  I've been Peering with both Route Servers in the Dallas IX for over a
month using a single 10G link with no issues. Due to capacity concerns I
had to augment to a 20G LAG. In order to do this, I shut the existing link
down (which dropped both eBGP sessions), used the existing IP space to
create the LAG, and then added the 2nd 10G link. The eBGP sessions
reestablished over the LAG and traffic started flowing error free. No
configuration changes to routing policy at all.  After a few days we
started to get customer complaints for certain sites/domains being
unreachable. I worked around the issue by not announcing the customer
blocks to the route servers and changed the return path to traverse
transit. This solved the issue, but I'm perplexed as to what could've
caused the issue, and where to look to resolve it.  If you guys could
provide feedback and point me in the right direction I'd appreciate it. TIA.

~Andy
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