cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
92250
Views
22
Helpful
17
Replies

[How to resolve] CRC errors

Josiah Inubio
Level 1
Level 1

Guys,

I see many crc errors on the interface, how will I face and resolve this issue? Is there any initial fault isolation that I must do? Sometimes crc errors occur on the GigE interface. Thanks.

FastEthernet0/13 is up, line protocol is up

  Hardware is Fast Ethernet, address is 0004.4d27.66cd (bia 0004.4d27.66cd)

  Description: EDL-P-Box-NO-4

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 250/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive not set

  Auto-duplex (Full), Auto Speed (100), 100BaseTX/FX

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 18:52:43, output 00:00:01, output hang never

  Last clearing of "show interface" counters never

  Queueing strategy: fifo

  Output queue 0/40, 0 drops; input queue 0/75, 0 drops

  5 minute input rate 12000 bits/sec, 6 packets/sec

  5 minute output rate 24000 bits/sec, 6 packets/sec

     14488019 packets input, 2783320210 bytes

     Received 345346 broadcasts, 0 runts, 0 giants, 0 throttles

     261028 input errors, 259429 CRC, 1599 frame, 0 overrun, 0 ignored

     0 watchdog, 84207 multicast

     0 input packets with dribble condition detected

     19658279 packets output, 3529106068 bytes, 0 underruns

     0 output errors, 0 collisions, 1 interface resets

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out

17 Replies 17

Not sure.

CRC, as what Inayath is saying, is a layer 1 issue.  Happens when your layer 1 is "dirty".  In your case, it's caused by a faulty cable.  If you have switches that I've mentioned, then you can run a test called TDR.

We have these on our transmission facilities but its OTDR (Optical). Also some of our Field Engineers use fluke networks cable analyzer.

OTDR is fibre optic.  Get your FE to do a TDR to determine where the faulty pair is located and replace if found.

Review Cisco Networking products for a $25 gift card