i have a 7206VXR NPE-G1 (IOS 12.4(18)) fitted with 2xPA-A3-OC3MM, 1xPA-A3-OC3SMI and 1xPA-A3-E3. I'm terminating DSL customers using Gi0/2 for uplink.
The Gigabit port is simply configured:
ip address xxx.xxx.xxx.xxx 255.255.255.252
The other end is connected to a Cisco 2960G with identical port configuration.
Sometimes the interface starts to behave badly and output errors counter starts to increase without any apparent reason. If i do a show controller, i see that the errors are due to tx_underflow. What's is strange is that if i cycle down/up any of the ATM interfaces, the problem disappears and come back later (30 mins to 7 hours). I see no errors on the 2960G port. I'm unsure if this could be an IOS bug or a bad hardware, i tried changing port to Gi0/1 but had the same results. Any hint?