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carltonp
join:2014-08-20

carltonp

Member

[H/W] Cisco CRC and Input Errors Problem

Hello Experts,

Our WAN interface is experiencing a large amount input errors and output errors, see below. Of particular notice is the fact the input errors are identical to the CRCs.

Serial0/0/0:0 is up, line protocol is up
Hardware is GT96K Serial
Description: BT MPLS 1BRACGNL.0394
MTU 1500 bytes, BW 1986 Kbit/sec, DLY 20000 usec,
reliability 251/255, txload 30/255, rxload 7/255
Encapsulation FRAME-RELAY IETF, loopback not set
Keepalive set (10 sec)
LMI enq sent 1139, LMI stat recvd 1138, LMI upd recvd 0, DTE LMI up
LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0
LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE
FR SVC disabled, LAPF state down
Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 03:09:43
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 209
Queueing strategy: Class-based queueing
Output queue: 0/1000/64/209 (size/max total/threshold/drops)
Conversations 0/96/256 (active/max active/max total)
Reserved Conversations 1/1 (allocated/max allocated)
Available Bandwidth 717 kilobits/sec
5 minute input rate 60000 bits/sec, 44 packets/sec
5 minute output rate 235000 bits/sec, 52 packets/sec
468880 packets input, 125910744 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
318 input errors, 318 CRC, 116 frame, 33 overrun, 0 ignored, 203 abort
592137 packets output, 471008276 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:1-31, SCC: 0, Transmitter delay is 0 flags

My initial thoughts are the problem is with the service provider. However, because the input errors are identical I'm not sure it the problem is with the provider?

Any help will be appreciated..

Cheers

Carlton
HELLFIRE
MVM
join:2009-11-25

HELLFIRE

MVM

said by carltonp:

Of particular notice is the fact the input errors are identical to the CRCs.

Offhand, I don't know if IOS considers an "input error" the same as a "CRC error." I seem to recall the counters I've seen the two numbers
being identical, but I never looked further into it.
said by carltonp:

My initial thoughts are the problem is with the service provider. However, because the input errors are identical I'm not sure it the problem is with the provider?

Same here -- INPUT in this case is FROM the service provider TO the device itself.

Question #1, what make / model is the actual device this is from and what make / model is the serial interface this is from -- "show inv"

Question #2, do you have any sort of (SNMP) monitoring for the interface?

To be sure, some sort of testing -- either by you or the carrier -- would probably be recommended.

My 00000010bits

Regards
carltonp
join:2014-08-20

carltonp

Member

Hi Hellfire,

Thanks for responding;

Cisco 2811 (revision 53.50) with 249856K/12288K bytes of memory.
Processor board ID FCZ1306726U
2 FastEthernet interfaces
1 Serial interface
1 Channelized E1/PRI port
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)

jmsam-brasil03-mpls#show inventory
NAME: "2811 chassis", DESCR: "2811 chassis"
PID: CISCO2811 , VID: V06 , SN: FCZ1306726U

NAME: "VWIC2-1MFT-G703 - 1-Port RJ-48 Multiflex Trunk - G.703", DESCR: "VWIC2-1MFT-G703 - 1-Port RJ-48 Multiflex Trunk - G.703"
PID: VWIC2-1MFT-G703 , VID: V01 , SN: FOC13103YQJ

Your thoughts are greatly appreciated...

battleop
join:2005-09-28
00000

battleop to carltonp

Member

to carltonp
What's the time frame for these errors? What do you get from "sh service-module serial 0/0/0 performance-statistics" Do any or all of the intervals show anything?

It's going to be a service provider issue but unless they can see the errors looping back to them the won't do anything. The concern is are you actively seeing errors or are these errors created by something that was a short term problem that's resolved it's self?

318 CRCs over an hour is something to look into. 318 over a week (it's not actively climbing) isn't going to raise much concern.
HELLFIRE
MVM
join:2009-11-25

HELLFIRE to carltonp

MVM

to carltonp
said by battleop:

318 CRCs over an hour is something to look into. 318 over a week (it's not actively climbing) isn't going to raise much concern.

Last clearing of "show interface" counters 03:09:43
 

2nd battleop See Profile . How exactly did you come across these errors? Manual inspection? Or is traffic interrupted / disrupted?

My 00000010bits

Regards
carltonp
join:2014-08-20

carltonp

Member

We came about them when the interface became overutilised. The interface was running at 90% for over 30mins

Why do you ask?
tired_runner
Premium Member
join:2000-08-25
CT
·Frontier FiberOp..

tired_runner

Premium Member

Maybe provider drops packets when it sees link congestion. Since you're not running frame PVCs, it will be hard to tell on your end.

As battleop See Profile suggested, I'd have provider test your circuit.
HELLFIRE
MVM
join:2009-11-25

HELLFIRE to carltonp

MVM

to carltonp
said by carltonp:

Why do you ask?

Trying to follow your troubleshooting... and as my old stats teacher used to say "correlation with(out) causation."

Not sure if there's any relation between these two stats
said by carltonp:

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 209

Last clearing of "show interface" counters 03:09:43
 

...so if overutilization started it, then I'd put the errors out of my mind for now and focus on that. Do you have any
(SNMP) monitoring for the interface? Either by you and/or the carrier? If you don't, may be a good idea to get some
in place.

Once that's done, then you can worry about the errors you're seeing. battlop and myself have given you a couple
suggestions on how to go about this.

My 00000010bits

Regards