Hi Alex, thank you very much for your reply. Unfortunatly I can open your links. In any case I changed the duplex to half and now the CRC error are decreased by 95% but instead collision have started to rise 🙁
this is the show int:
FastEthernet0/1 is up, line protocol is up
Hardware is Fast Ethernet, address is 000f.f7d0.496d (bia 000f.f7d0.496d)
Internet address is xxx.xxx.xxx.xxx/28
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 2/255, rxload 4/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of “show interface” counters never
Input queue: 2/4096/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/4096 (size/max)
5 minute input rate 1866000 bits/sec, 2684 packets/sec
5 minute output rate 1091000 bits/sec, 1406 packets/sec
192817259 packets input, 1847950642 bytes
Received 8007 broadcasts, 0 runts, 0 giants, 0 throttles
111530 input errors, 111530 CRC, 25125 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
122369142 packets output, 1210563845 bytes, 0 underruns
334 output errors, 8139613 collisions, 4 interface resets
0 babbles, 334 late collision, 4092325 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Thanks!