CRC, Frames et Overrun Erreur

[HakimAdmin1981]

Bonjour Tous le monde, 

nous avons une liaison louée entre Casablanca et Courbevoie France, et nous avons trop d'erreur CRC, frames et Overrun dessus. lorsque l'opérateur interviens en faisant des tests bout en bout il ne trouve aucune perte de packet et lorsque on remets notre routeur  la commande show interface nous remonte des erreur. 

SVP, avez vous une solution pour nous?

Serial0/0/0:0 is up, line protocol is up
  Hardware is GT96K Serial
  Description: interco vivaction 1024K via interface G703
  Internet address is 172.16.0.18/30
  MTU 1500 bytes, BW 1024 Kbit, DLY 20000 usec,
     reliability 255/255, txload 87/255, rxload 89/255
  Encapsulation PPP, LCP Open
  Open: IPCP, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:24, output 00:00:05, output hang never
  Last clearing of "show interface" counters 00:46:57
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/4/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 921 kilobits/sec
  5 minute input rate 361000 bits/sec, 167 packets/sec
  5 minute output rate 352000 bits/sec, 171 packets/sec
     476732 packets input, 134306920 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     4 input errors, 4 CRC, 4 frame, 1 overrun, 0 ignored, 2 abort
     490582 packets output, 116067692 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
  Timeslot(s) Used:1-16, SCC: 0, Transmitter delay is 0 flags

[Mark Malone]

change the local cabling on the interface , crcs and inputs together means layer 1 issue

1st change cabling and then reseat card if still an issue and retest

[HakimAdmin1981]

Bonjour Et merci Mark,

j'ai déjà changé le câble trois fois. aussi j'ai déjà fais une reset card. les erreurs persistent toujours. ça ne peux pas être un problème électrique ? car la terre de mon routeur n'est pas branchée.

[Mark Malone]

Hi

have you tried reseating the card if the cables already swapped or is there a spare serial slot you can temporarily connect to, to rule out the card hardware , sometimes they can go but I would expect to see a lot more errors if it was broken

[HakimAdmin1981]

yes, I already reinstall the card. and I change all the cables.

[Mark Malone]

Is there a free serial port preferably not on the same module that you can move the circuit over to, to see if the issue persists ?

If it the issue is still there after moving the circuit, then the problem could be on the ISP mux , if it does not follow then the module could be faulty since you have already changed the cables so many times

[HakimAdmin1981]

ce que je ne comprends pas c'est que à chaque fois FAI fait des tests bout en bout il ne trouve aucune erreur pendant 24 heures de tests. dés que je remets mon routeur les erreurs apparaissent au bout de 30 minutes maximum. j'ai changé carrément le routeur en mettant un nouveau jamais utilisé avec une nouvelle carte G703. je crois que c un problème de configuration.

tu veux que je t'envois la config de l'interface ?

[Mark Malone]

If you have changed the card then the issue is on the ISP as you have changed the card and the cables and input/crc errors are layer 1 physical errors and still been seen

As well these are input errors coming into your device , your not sending them out so if your far end is clean and the inputs only seen on 1 side then it can only be something like cabling/card or mux

The problem with ISP tests sometimes there not that thorough and sometimes they only test from MUX-MUX the equipment they own , sometimes they do not test what is known as the last mile from customer to ISP i would calrify that with them

Post the config anyway il take a look and are the errors constantly incrementing

[HakimAdmin1981]

interface Serial0/0/0:0
 description interco vivaction 1024K via interface G703
 bandwidth 1024
 ip address 172.16.0.18 255.255.255.252
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 encapsulation ppp
 no cdp enable
 max-reserved-bandwidth 90
!
interface BRI0/1/0
 no ip address
 encapsulation hdlc
 shutdown
!
 

[Mark Malone]

That config looks standard nothing there that would contribute to input errors or crcs.

The no ip unreachable will cause you trouble when testing though as it can block icmp and cause drops in traceroutes but that would not have any effect on what your issue is