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NAS read latency caused by bad SFP

Last Updated:

Applies to



  • Slow read performance is reported on NAS shares
  • CRC errors are reported on a switch port connected to the controller port that host the LIF
Ethernet1/40 is up
admin state is up, Dedicated Interface
  Hardware: 1000/10000/25000 Ethernet, address: 748f.c20e.54b7 (bia 748f.c20e.54b7)
  Description: itsgbslnasc01n1
  MTU 9216 bytes, BW 10000000 Kbit , DLY 10 usec
  reliability 253/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, medium is broadcast
  Port mode is access
  full-duplex, 10 Gb/s, media type is 10G
  Beacon is turned off
  Auto-Negotiation is turned on  FEC mode is Auto
  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
    admin fec state is auto, oper fec state is off
  Last link flapped 1week(s) 4day(s)
  Last clearing of "show interface" counters never
  4 interface resets
  Load-Interval #1: 30 seconds
    30 seconds input rate 11320 bits/sec, 1 packets/sec
    30 seconds output rate 29768 bits/sec, 7 packets/sec
    input rate 11.32 Kbps, 1 pps; output rate 29.77 Kbps, 7 pps
  Load-Interval #2: 5 minute (300 seconds)
    300 seconds input rate 6448 bits/sec, 3 packets/sec
    300 seconds output rate 17896 bits/sec, 5 packets/sec
    input rate 6.45 Kbps, 3 pps; output rate 17.90 Kbps, 5 pps
    179794285 unicast packets  180564 multicast packets  243884 broadcast packets
    180218733 input packets  149626636212 bytes
    0 jumbo packets  0 storm suppression packets
    127 runts  0 giants  3426004 CRC  0 no buffer
    3426311 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
    150701546 unicast packets  10728108 multicast packets  5426639 broadcast packets
    166856293 output packets  62138770021 bytes
    0 jumbo packets
    0 output error  0 collision  0 deferred  0 late collision
    0 lost carrier  0 no carrier  0 babble  1889662 output discard
    0 Tx pause

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