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HWIC-2SHDSL CRC errors

Hello

 

I have the following issue, CRC errors increasing at the ATM interface level but not AAL5 CRC errors at the pvc level, how come?

 

Hardware is PID: HWIC-2SHDSL 

 

#sh int ATM0/0/0.2
ATM0/0/0.2 is up, line protocol is up
  Hardware is DSLSAR, address is 4c00.824e.fbe8 (bia 4c00.824e.fbe8)
  Description: Enlace De Datos
  Internet address is 172.15.37.182/30
  MTU 4470 bytes, BW 2048 Kbit/sec, DLY 110 usec,
     reliability 255/255, txload 5/255, rxload 44/255
  Encapsulation ATM
  Keepalive not supported
     2817967 packets input, 2180607949 bytes
     2360382 packets output, 515215928 bytes
     0 OAM cells input, 0 OAM cells output
  AAL5 CRC errors : 0
  AAL5 SAR Timeouts : 0
  AAL5 Oversized SDUs : 0
  Last clearing of "show interface" counters 1d17h

sh int ATM0/0/0
ATM0/0/0 is up, line protocol is up
  Hardware is DSLSAR, address is 4c00.824e.fbe8 (bia 4c00.824e.fbe8)
  MTU 4470 bytes, sub MTU 4470, BW 2048 Kbit/sec, DLY 110 usec,
     reliability 255/255, txload 4/255, rxload 43/255
  Encapsulation ATM, loopback not set
  Keepalive not supported
  Encapsulation(s): AAL5
  8 maximum active VCs, 256 VCs per VP, 1 current VCCs
  VC Auto Creation Disabled.
  VC idle disconnect time: 300 seconds
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters 1d17h
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 33
  Queueing strategy: Per VC Queueing
  5 minute input rate 350000 bits/sec, 36 packets/sec
  5 minute output rate 39000 bits/sec, 27 packets/sec
     2818537 packets input, 2181029545 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 5129 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     2360828 packets output, 515273375 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out

1 Reply 1

Leo Laohoo
Hall of Fame
Hall of Fame

Interface-level error is the PHYSICAL level and the other is a logical segmentation of the physical interface.  

 

If CRC is incrementing at that rate, then contact the ISP and get them to run a Bit Error Rate test (BER).

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