For about 6 months we've had a 2811 with Version 15.1(4)M1 with a T1 card. No errors on the line. Then we swapped to a 2911 running 15.2(4)M3. We took the existing T1 card from the 2811 and just moved it into the 2911.
After the 2911 swap we started experiencing a lot of CRC errors on the line. We asked our provider to test the T1, no problems. We swapped T1 cards with a new one, no change (still lots of CRC errors). We moved back to the 2811 (moved the T1 card again) -- no more errors.
Anything I should investigate? The only differences is the hardware (2811 vs 2911) and a small IOS change.
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