Friday, July 4, 2025

Cisco Nexus Switch SFP Validation Failed Error

I had to configure a Cisco Nexus 5K switch to be a trunk port and encountered an SFP validation failed error. I've checked the port is using a 10G SFP fiber optic but there was a typo error in the interface speed. After I hard coded the correct interface speed, the port went up afterwards.

 

N5K# show interface Ethernet1/32

Ethernet1/32 is down (SFP validation failed)

 Dedicated Interface

  Hardware: 1000/10000 Ethernet, address: 8c60.4f2b.1234 (bia 8c60.4f2b.1234)

  Description: # TRUNK #

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

  reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA

  Port mode is trunk

  auto-duplex, 1000 Mb/s, media type is 10G

  Beacon is turned off

  Input flow-control is off, output flow-control is off

  Rate mode is dedicated

  Switchport monitor is off

  EtherType is 0x8100

  Last link flapped 96week(s) 6day(s)

  Last clearing of "show interface" counters 543w6d

  11 interface resets

  30 seconds input rate 0 bits/sec, 0 packets/sec

  30 seconds output rate 0 bits/sec, 0 packets/sec

  Load-Interval #2: 5 minute (300 seconds)

    input rate 0 bps, 0 pps; output rate 0 bps, 0 pps

  RX

    2065321971623 unicast packets  4764671933 multicast packets  142845790 broadcast packets

    2070229489346 input packets  805314007316143 bytes

    7349470453 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

    2209966729972 unicast packets  8503102832 multicast packets  2429472711 broadcast packets

    2220899685878 output packets  1550671605050314 bytes

    10754632287 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

 

 

N5K# show run interface Ethernet1/32

 

!Command: show running-config interface Ethernet1/32

!Time: Thu May 15 04:55:25 2025

 

version 7.0(1)N1(1)

 

interface Ethernet1/32

  description TRUNK

  switchport mode trunk

  speed 1000

 

 

N5K# show interface e1/32 transceiver

Ethernet1/32

    transceiver is present

    type is 10Gbase-SR

    name is CISCO-FINISAR  

    part number is FTLX8571D1234-56

    revision is A  

    serial number is FNS1123ABCD   

    nominal bitrate is 10300 MBit/sec

    Link length supported for 50/125um OM2 fiber is 82 m

    Link length supported for 62.5/125um fiber is 26 m

    Link length supported for 50/125um OM3 fiber is 300 m

    cisco id is --

    cisco extended id number is 4

         

 

N5K# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

N5K(config)# interface Ethernet1/32

N5K(config-if)# speed ?

  10     10Mb/s

  100    100Mb/s

  1000   1Gb/s

  10000  10Gb/s

  40000  40Gb/s

  auto   Auto negotiate speed

 

N5K(config-if)# speed 10000

N5K(config-if)# end

N5K# copy run start

[########################################] 100%

Copy complete, now saving to disk (please wait)...

 

N5K# show interface Ethernet1/32

Ethernet1/32 is up

 Dedicated Interface

  Hardware: 1000/10000 Ethernet, address: 8c60.4f2b.1234 (bia 8c60.4f2b.1234)

  Description: # TRUNK #

  MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec

  reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA

  Port mode is trunk

  full-duplex, 10 Gb/s, media type is 10G

  Beacon is turned off

  Input flow-control is off, output flow-control is off

  Rate mode is dedicated

  Switchport monitor is off

  EtherType is 0x8100

  Last link flapped 04:17:12

  Last clearing of "show interface" counters 05:06:36

  12 interface resets

  30 seconds input rate 24 bits/sec, 0 packets/sec

  30 seconds output rate 720 bits/sec, 0 packets/sec

  Load-Interval #2: 5 minute (300 seconds)

    input rate 24 bps, 0 pps; output rate 440 bps, 0 pps

  RX

    0 unicast packets  521 multicast packets  0 broadcast packets

    521 input packets  51579 bytes

    0 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

    0 unicast packets  8502 multicast packets  0 broadcast packets

    8502 output packets  1343284 bytes

    0 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

 

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