IX2015(config)# sh devices FastEthernet0/1
Device FastEthernet0/1 is testing
FastEthernet status:
Physical address is 00:30:13:76:0d:0a
Full-duplex, 100M b/s, 100BaseTX
Statistics:
5679 input frames
8044 output frames, 8044 output requests
Rx errors:
0 alignment errors, 95 CRC errors
1 long frames, 0 short frames, 0 overflows
Tx errors:
0 single collisions, 0 multiple collisions
0 excessive collisions, 0 late collisions
0 deferred transmissions, 0 carrier sense errors
0 heart beat errors, 0 underflows

CRCエラー出まくりだな。物理か・・・。