I have cisco Nexus 3048TP switch (48x1G + 4x10G)

  cisco Nexus 3048 Chassis ("48x1GE + 4x10G Supervisor")
  Intel(R) Celeron(R) CPU        P4505  @ 1.87GHz with 3665240 kB of memory.
  Processor Board ID FOC17237JKC

I am seeing this error on port e1/49 which is 10G port and i have connected 10G SFP+ transceiver

 Ethernet1/49 is down (SFP validation failed)
     Dedicated Interface
      Hardware: 1000/10000 Ethernet, address: f872.eaae.36b8 (bia f872.eaae.36b8)
      MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec
      reliability 255/255, txload 1/255, rxload 1/255
      Encapsulation ARPA
      Port mode is access
      auto-duplex, 10 Gb/s, media type is 10G

As per documentation they said you need to set speed so i did and got this error

n3k(config)# int e1/49
n3k(config-if)# speed 10000
ERROR: Ethernet1/49: Configuration does not match the port capability.

Interface capability

n3k# sh int e1/49 capabilities
  Model:                 N3K-C3048TP-1GE-SUP
  Type (SFP capable):    Unknown Type-(unknown)
  Speed:                 10000
  Duplex:                full
  Trunk encap. type:     802.1Q
  Channel:               yes
  Broadcast suppression: percentage(0-100)
  Flowcontrol:           rx-(off/on),tx-(off/on)
  Rate mode:             none
  QOS scheduling:        rx-(6q1t),tx-(1p6q0t)
  CoS rewrite:           no
  ToS rewrite:           no
  SPAN:                  yes
  UDLD:                  yes
  MDIX:                  no
  Link Debounce:         yes
  Link Debounce Time:    yes
  Pvlan Trunk capable:   no
  TDR capable:           no
  FabricPath capable:    no
  Port mode:             Routed,Switched
  FEX Fabric:            no

This switch located in remote datacenter so i can't re-seed until i have resources available, is there anything else i can do remotely?

  • What kind of SPF is in the port?
    – Ron Trunk
    Sep 11, 2018 at 20:34
  • FS fs.com/products/11552.html I have 5000 SFP running in datacenter on all kind of hardware also i have same model of switch in other datacenter and that running fine with same model of SFP, I can guarantee its not SFP+ issue.. its something related to configuration
    – Satish
    Sep 11, 2018 at 20:36
  • 2
    Sixteen dollars? You get what you pay for, Satish.
    – Ron Trunk
    Sep 11, 2018 at 20:39
  • It could certainly be a bad SFP, or you have a different hardware or software version in the switch that simply rejects this SFP..
    – Ron Maupin
    Sep 11, 2018 at 20:42
  • Believe me we have 50 nexus switches and 5 ASR routes and all running on same SFP+ and they all fine.. even my other datacenter has Nexus 3048 switch running on same model of SFP.. do you still this it's SFP issue? I have working switch on same model
    – Satish
    Sep 11, 2018 at 20:43

1 Answer 1



After reboot switch it fixed my issue, Now its showing SFP Type 10Gbase-SR

n3k# show int e1/49 capabilities
  Model:                 N3K-C3048TP-1GE-SUP
  Type (SFP capable):    10Gbase-SR
  Speed:                 10000
  Duplex:                full
  Trunk encap. type:     802.1Q
  Channel:               yes

Look like you need to set speed first before inserting SFP.

Quote from cisco documentation:

enter image description here

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