Hello, I have a Cisco 7206 (NPE200) with a serial interface that is hooked up to a T3. I have this strange problem where I am getting occassional input drops. They come in bursts of about 100, around 3 to 6 times a day, during periods of both little activity and peak usage. The input queue is never full or even half full, it is usually at 0. CPU utilization never goes above about 25% or so. We use only about 10% of our T3 during peak. There are no other errors on this or any other interface and no queues are being filled on any other interface (there are 3 other fastethernet interfaces). I've tried increasing the hold-queue in parameter for the interface and I've had mixed results. The higher I go, the less input drops I see until around a queue of about 200. Once I set it around that value or higher, I start to see slight increments in the no buffer and ignored counters on the interface. I've tried tweaking the buffers (show buffers output showed failures) following Cisco's guidelines ([URL]http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00800a7b80.shtml[/URL]) but I haven't had much luck their either unless I'm missing something. Any suggestions? Thanks, Spencer