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Input Errors and CRC

Posted on 2008-10-06
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Last Modified: 2012-05-05
Recently we had a 2M Ethernet Link for a Internet Connection to the Telco. We have actually had a IPSEC VPN Connection over the Internet Link. Once we start moving the traffic on the IPSEC link we are seeing a log of CRC and Input Errors.

The problem is once i stop all the IPSEC traffic and just do a continous ping to yahoo.com, there is no build on the errors both on CRC and Input errors. We have checked the cable and everything, it seems to be fine. Do you think it would be a Interface issue? Or is there something we can ask the ISP to check for us? Please help me, i am stuck and dont know how to move ahead on this.


Below is the interface output, in this the error is less but actually it is building a lot over the time.

GigabitEthernet0/1 is up, line protocol is up
  Hardware is BCM1125 Internal MAC, address is 0019.e899.4561 (bia 0019.e899.456
1)
  Description: << Internet Link to Telkom ID >>
  MTU 1500 bytes, BW 2048 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is RJ45
  output flow-control is XON, input flow-control is XON
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:01, output 00:00:01, output hang never
  Last clearing of "show interface" counters 01:55:12
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     12974 packets input, 4399689 bytes, 0 no buffer
     Received 0 broadcasts, 4 runts, 0 giants, 0 throttles
     38 input errors, 22 CRC, 0 frame, 12 overrun, 0 ignored
     0 watchdog, 3562 multicast, 0 pause input
     0 input packets with dribble condition detected
     9522 packets output, 1818952 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out
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Question by:kamalgopi
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Pugglewuggle earned 2000 total points
ID: 22654274
This sounds like it might be a problem on the telco's side if you have your duplex/speed setup right (it probably is fine, it's currently at 100/full).
Please have them check again to verify the problem is not on your side.
Another thing would be to check the cable... verify there is no problem with the cable or that if doesn't have a massive amount of interference to close to it (power lines, transformers, power breakers, some sort of wireless broadcast apparatus other than wifi).
Cheers!
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by:kamalgopi
ID: 22655853
Hi,

Thanks for the advise. As you said both the Speed and Duplex is set correctly. Let me call up the Telco to check on the link and maybe do a end to end test to see if we are seeing the Input and CRC Errors.

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Expert Comment

by:Pugglewuggle
ID: 22660967
kk! let me know!
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LVL 11

Author Comment

by:kamalgopi
ID: 22665642
Hi,

Yeah it was a Issue with the Telco cable from there device in our site to the router. Once they changed it eveything seems to be fine. THanks for you help.
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LVL 12

Expert Comment

by:Pugglewuggle
ID: 22665753
I figured it was the telco... they never have their acts together.
Cheers! Glad it's fixed!
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