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Hi guys,
I’m experiencing a problem that is driving me crazy.
I have a Cisco AS5350 and a 3700 router series used as GK.
On both machines if I run a ‘show interface fastethernet 0/1’ I can see a lot of CRC error and only on the AS5350 also frame error.
I already changed the hub and the cables but the problem persist.Hope someone could give me some hints.
Thanks a lot…
Hello,
Please post the FULL output from “show interface fast0/1”.
Most ethernet problems arise from bad cabling or duplex mismatch.
You can use following links for troubleshooting:
http://www.cisco.com/univercd/cc/td/doc/product/voice/ics/ics26/icstg26/tsether2.htm
http://www.cisco.com/warp/public/63/eth_collisions.htmlHi 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 outThanks!
Manny,
Collisions are normal events in shared Ethernet environment. You will virtually always see them in Half-Duplex ethernet operation.
It seems that your hub does not support full-duplex (and if it did, it would be switch then). If error counters do not increase anymore, just collisions, then you are fine.
If your collision rate rises above 10-20%, think about replacing the hub with a full-duplex switch.
Thank you very much for the reply.
I will plan to buy a switch.
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