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2900 Series Router - CRC Errors

Answered Question
Aug 9th, 2012
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Greetings All,


I'm getting CRC errors on one of my serial interfaces:


#sh int Serial0/0/0:1

Serial0/0/0:1 is up, line protocol is up

  Hardware is Serial

  Description: DHEC.800936.811.ATI

  MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,

     reliability 255/255, txload 1/255, rxload 21/255

  Encapsulation PPP, LCP Open, multilink Open

  Link is a member of Multilink bundle Multilink1, loopback not set

  Keepalive set (10 sec)

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters 17:20:42

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: weighted fair  [suspended, using FIFO]

  FIFO output queue 0/40, 0 drops

  5 minute input rate 132000 bits/sec, 18 packets/sec

  5 minute output rate 9000 bits/sec, 11 packets/sec

     756027 packets input, 733579767 bytes, 0 no buffer

     Received 0 broadcasts (0 IP multicasts)

     2123 runts, 0 giants, 0 throttles

     2660 input errors, 532 CRC, 0 frame, 0 overrun, 0 ignored, 5 abort

     508136 packets output, 77127054 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 unknown protocol drops

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions

  Timeslot(s) Used:1-24, SCC: 0, Transmitter delay is 0 flags


I have open tickets with telco and they are not seeing any problems on the ckt. Also, they mention that issue may be hardware related.


Are there any troubleshooting test and I can perform on the router, to determine what may be the issue.


Cheers

Correct Answer by paolo bevilacqua about 5 years 1 week ago

I have removed all my posts in this thread due to them being half-rated for no reason.

Correct Answer by Sandeep Choudhary about 5 years 1 week ago

Hi,


Check out the below explanation for CRC error and farme error and few useful links to trouble shoot these type of problems.

CRC errors usually indicates noise or transmission problems on the LAN interface or the LAN itself. A high number of CRCs is usually the result of collisions but can also indicate a physical issue (such as cabling, bad interface or NIC) or a duplex mismatch or a station transmitting bad data.




  TRY THIS: Check cables to determine whether any are damaged. If 100BaseTX is being
  used, ensure Category 5 cabling is being used and not another type, such as Category
  3.



or try this:


Clear the interface counter and start with changing the fiber patch between the 2 switches.  If that does not help then replace the GBICs and see what happens.



http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html


http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html


Hope that helps out your query !!


Please rate if it helps.

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Correct Answer
Sandeep Choudhary Thu, 08/09/2012 - 06:25
User Badges:
  • Purple, 4500 points or more
  • Cisco Designated VIP,

    2017 Wireless

Hi,


Check out the below explanation for CRC error and farme error and few useful links to trouble shoot these type of problems.

CRC errors usually indicates noise or transmission problems on the LAN interface or the LAN itself. A high number of CRCs is usually the result of collisions but can also indicate a physical issue (such as cabling, bad interface or NIC) or a duplex mismatch or a station transmitting bad data.




  TRY THIS: Check cables to determine whether any are damaged. If 100BaseTX is being
  used, ensure Category 5 cabling is being used and not another type, such as Category
  3.



or try this:


Clear the interface counter and start with changing the fiber patch between the 2 switches.  If that does not help then replace the GBICs and see what happens.



http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html


http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html


Hope that helps out your query !!


Please rate if it helps.

Correct Answer
paolo bevilacqua Thu, 08/09/2012 - 08:52
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  • Super Gold, 25000 points or more
  • Hall of Fame,

    Founding Member

I have removed all my posts in this thread due to them being half-rated for no reason.

joseacruz Fri, 08/31/2012 - 08:49
User Badges:

Hello To all!,


I just want to thanks for all the help.


All the information that you presented was very helpful.


Cheers

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