[c-nsp] Incrementing input errors and ignored counters on POS OC48 interface

Aaron Daubman daubman at gmail.com
Wed Jun 7 13:40:23 EDT 2006


Greetings,

I'm trying to determine the cause of incrementing 'input error' and
'ignored' counters on my GSR12410's OC48 LC.

Searching around, it seems ignored errors are usually due to exceeding
buffers/no mem drops:
http://www.cisco.com/warp/public/63/ignored_nomem_18003.html

This doesn't appear to be the case, however (after running the show
commands in the link above, and the input stream is only ~95Mbps...)

The network is a lab setup:

[Ixia](OC48)<==>(OC48)[ONS15454](OC48)<==>(OC48)[GSR](GigE)<==>[Ixia](GigE)

Any suggestions on how to troubleshoot further?

Relevant output follows:
---snip---
GSR-1#sh ru | b SONET
controller SONET 0/0
  sts-1 1 - 48 pos
!


GSR-1#sh ru i p0/0:1
Building configuration...

Current configuration : 217 bytes
!
interface POS0/0:1
  no ip address
  no ip directed-broadcast
 load-interval 30
  carrier-delay msec 0
  no keepalive
 ipv6 address FE80::200:FF:FE02:101 link-local
 ipv6 enable
  ipv6 cef
  crc 32
  pos scramble-atm
end


GSR-1#show interfaces POS 0/0:1 controller
POS0/0:1 is up, line protocol is up
  Hardware is Packet over SONET
  MTU 4470 bytes, BW 2488000 Kbit, DLY 100 usec, rely 255/255, load 1/255
  Encapsulation HDLC, crc 32, loopback not set
  Keepalive not set
  Scramble enabled
  Carrier delay is 0 msec
  Last input 1d03h, output 00:00:11, output hang never
  Last clearing of "show interface" counters 00:07:32
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
        Available Bandwidth 2395851 kilobits/sec
  30 second input rate 0 bits/sec, 0 packets/sec
  30 second output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
              0 parity
     4500773 input errors, 0 CRC, 0 frame, 0 overrun, 4500773 ignored, 0 abort
     8 packets output, 2808 bytes, 0 underruns
     0 output errors, 0 applique, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

POS0/0:1
PATH
  AIS = 0          RDI    = 0          FEBE = 0          BIP(B3) = 0
  LOP = 0          NEWPTR = 0          PSE  = 0          NSE     = 0

Active Defects: None
Active Alarms:  None
Alarm reporting enabled for: PLOP B3-TCA

  S1S0 = 00, C2 = 16
PATH TRACE BUFFER : STABLE
  Remote hostname :
  Remote interface:
  Remote IP addr  :
  Remote Rx(K1/K2):   /    Tx(K1/K2):   /

BER thresholds:  B3 = 10e-6
---snip---

Thanks,
     ~Aaron


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