Hi Mark, Two things stand out to me about this bug. First, it is unresolved. That means a TAC case would help us to better understand the impact to you, our customers, and to move forward toward a fix. Second, there are some indicators that suggest this affects not just T1 interfaces. Again, a TAC case would help to recreate the issue, confirm the conditions, and update the bug accordingly. While we are discussing it internally it would be a big help if you could open a TAC case to further the inquiry. Regards, Wes