Solved: 2900 Series Router - CRC Errors

joseacruz · ‎08-09-2012

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

Sandeep Choudhary · ‎08-09-2012

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

Hope that helps out your query !!

Please rate if it helps.

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paolo bevilacqua · ‎08-09-2012

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