[c-nsp] 7600 RP Invalid Packet Drops

[Antonio Soares]

I had this problem a few weeks ago. It was bug CSCte89940:

+++++++++++++++
IBC invalid packet drop on RSP 720  
Symptoms While pinging 7600 with RSP 720 we see some drops. These drops are
counted under show ibc under "Invalid pkts dropped" Conditions The issue is
seen on RSP 720 with SRD image. Workaround SRC05 and SRB07 do not have this
issue, nor it is present with SUP 720.
+++++++++++++++


Regards,

Antonio Soares, CCIE #18473 (R&S/SP)
amsoares at netcabo.pt
http://www.ccie18473.net



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Ivan
Sent: sábado, 30 de Abril de 2011 01:24
To: cisco-nsp
Subject: [c-nsp] 7600 RP Invalid Packet Drops

I have a 7600 with a RSP720-3CXL-GE.  When pinging between the 7600 and 
any other device (I have tried a few) I am loosing packets - usually 
5/10000 ish.

I have eventually been able to match the number of lost packets with a 
counter from the output of "show ibc" which from my searching of the 
archives "shows you the inband interface leading to the RP CPU".  The 
counter is: Invalid pkts dropped: 306

Can anyone advise what this counter indicates?  Only seems to increment 
with my ping traffic and not any customer traffic.  I have other similar 
hardware but can not reproduce the issue :-(

The output

7600#show ibc
Interface information:
         Interface IBC0/0(idb 0x1C88ECE8)
         5 minute rx rate 1138000 bits/sec, 156 packets/sec
         5 minute tx rate 2305000 bits/sec, 306 packets/sec
         1529092452 packets input, 97618397184 bytes
         1480180863 broadcasts received
         1522436849 packets output, 93778000882 bytes
         15858294 broadcasts sent
         0 Bridge Packet loopback drops
         1415112685 Packets CEF Switched, 0 Packets Fast Switched
         0 Packets SLB Switched, 0 Packets CWAN Switched
         Label switched pkts dropped: 0    Pkts dropped during dma: 0
         Invalid pkts dropped: 306    Pkts dropped(not cwan consumed): 0
         Xconnect pkts processed: 29, dropped: 0
         Xconnect pkt reflection drops: 0
         Total paks copied for process level 29
         Total short paks sent in route cache 1346148563
         Total throttle drops 0    Input queue drops 0
         total spd packets classified (50929199 low, 6698050 medium, 
34521686 high)
         total spd packets dropped (0 low, 0 medium, 0 high)
         spd prio pkts allowed in due to selective throttling (0 med, 0 
high)
         IBC resets   = 1; last at xxx 2010

Driver Level Counters: (Cumulative, Zeroed only at Reset)
           Frames          Bytes
   Rx(0)   878738849       2018480538
   Rx(1)   653772091       3242895654
   Tx(0)   1522436850      1746755712

  Input Drop Frame Count
      Rx0 = 0                Rx1 = 0
  Per Queue Receive Errors:
      FRME   OFLW   BUFE   NOENP  DISCRD DISABLE BADCOUNT
  Rx0 0      0      0      0      0        0    0
  Rx1 0      0      0      0      0        0    0


   Tx Errors/State:
    One Collision Error   = 0            More Collisions       = 0
    No Encap Error        = 0            Deferred Error        = 0
    Loss Carrier Error    = 0            Late Collision Error  = 0
    Excessive Collisions  = 0            Buffer Error          = 0
    Tx Freeze Count       = 0            Tx Intrpt Serv timeout= 1

   Counters collected at Idb:
    Is input throttled    = 0            Throttle Count        = 0
    Rx Resource Errors    = 0            Input Drops           = 306
    Input Errors           = 0
    Output Drops          = 0            Giants/Runts          = 0/0
    Dma Mem Error         = 0            Input Overrun         = 0

7600#show platform hardware pfc mode
PFC operating mode : PFC3CXL

Cheers

Ivan
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