UDP clamped on service provider links

[bdflemin at gmail.com (Brad Fleming)]

> 
>> In one case, when we were having an issue with a SIP trunk, we re-numbered
>> our end to another IP in the same subnet. Same path from A to Z, but the
>> packet loss mysteriously disappeared using the new IP.
> 
> lag hash put you on a congested fiber?

Or perhaps a switch fabric module geeked out and impacted 1/3rd or 1/4th of the flows through the box? We?ve seen that exact scenario more times then I want to admit with our old equipment vendor.