Expected Output Errors

Expected Output Errors

Cisco Nexus hardware -EX, -FX1-3, and N93xxC can show output errors on internal interface counters and cause a fault (F119936) to be raised in ACI environments. As long as the output error counters under show interface remains unchanged, this is an expected behavior.

Also, note that the show platform internal counters port output error will increment. However, if checking the same port with show interface, the output error rate will not increment.

This section provides an example of the expected output errors. 

module-1# show platform internal counters port 51
Stats for port 51
(note: forward drops includes sup redirected packets too)
IF          LPort                    Input                       Output
                              Packets       Bytes          Packets    Bytes
eth-1/51    51  Total          669974   110547179       692398    194500094
                   Unicast     112138    30292113       439809    161274739
                   Multicast        0           0       251315     33075023
                   Flood       261736    32880023         1274       150332
                Total Drops    296100                   261736
                   Buffer           0                        0
                   Error            0                   261736
                   <...>
leaf-101# show interface ethernet 1/51
Ethernet1/51 is up
admin state is up, Dedicated Interface
  Hardware: 1000/10000/100000/40000 Ethernet, address: 0000.0000.0000 (bia a023.9f56.48f3)
  MTU 9366 bytes, BW 40000000 Kbit, DLY 1 usec
  reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, medium is broadcast
  Port mode is routed
  full-duplex, 40 Gb/s, media type is 40G
  FEC (forward-error-correction) : disable-fec
  Beacon is turned off
  Auto-Negotiation is turned on
  Input flow-control is off, output flow-control is off
  Auto-mdix is turned off
  Rate mode is dedicated
  Switchport monitor is off
  EtherType is 0x8100
  EEE (efficient-ethernet) : n/a
  Last link flapped 1d14h
  Last clearing of "show interface" counters never
  1 interface resets
  30 seconds input rate 4912 bits/sec, 3 packets/sec
  30 seconds output rate 1944 bits/sec, 2 packets/sec
  Load-Interval #2: 5 minute (300 seconds)
    input rate 3360 bps, 2 pps; output rate 10504 bps, 4 pps
  L3 in Switched:
    ucast: 0 pkts, 0 bytes - mcast: 0 pkts, 0 bytes
  L3 out Switched:
    ucast: 0 pkts, 0 bytes - mcast: 0 pkts, 0 bytes
  RX
    352942 unicast packets  317417 multicast packets  0 broadcast packets
    670359 input packets  110608007 bytes
    8643 jumbo packets  0 storm suppression bytes
    0 runts  0 giants  0 CRC  0 no buffer
    0 input error  0 short frame  0 overrun   0 underrun  0 ignored
    0 watchdog  0 bad etype drop  0 bad proto drop  0 if down drop
    0 input with dribble  0 input discard
    0 Rx pause
  TX
    417109 unicast packets  275682 multicast packets  0 broadcast packets
    692791 output packets  194559643 bytes
    7173 jumbo packets
    0 output error  0 collision  0 deferred  0 late collision
    0 lost carrier  0 no carrier  0 babble  0 output discard
    0 Tx pause