We currently had to RMA both PIX 525s due to increasing crc errors. After swapping the old ones with the new we are still seeing crc errors on all gig interfaces. We have swapped the gig nic's and the sfp's and the fiber patch cables, yet still the crc errors continue to climb. Another thing that's interesting is that when we disconnect the secondary we see an increase in throughput. Any insight as to what else could be causing the errors would be appreciated.
First, double check the speed/duplex configuration and make sure they match on both ends of each cable. Also, CRC errors are usually caused by the transmitter, but they show up as errors on the receiver side. Therefore, if you're only seeing CRC errors on the PIX and the switch ports look clean, I would focus on why the switch is corrupting the packets. You might try moving the cables to a different unused switch port and see if that helps.
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