Can I stick an SFP transceiver module in a SFP+ port in a Cisco Nexus 5K for example if I need to connect a fast ethernet switch with a 1 Gbps SFP uplink port? I saw this Nexus's ports are 1/10 Gbps.

Does it depend on a switch module or is there a general rule, that they should be compatible?


1 Answer 1



GigabitEthernet SFP transceivers are supported in 1/10G SFP+ Nexus 5k slots. Please see the Nexus 5k Datasheet (see Table 2) for details.

Original Answer:
No FastEthernet SFPs are listed in the Nexus 5k Datasheet (see Table 2); as such, you're out of luck. FastEthernet SFPs are not supported on the Nexus 5k; however, many FastEthernet switches have GigabitEthernet uplinks. If that FE switch has a GE uplink, then use that GE port on the FE switch.

The old GBIC transceiver format was pretty generic and you could ignore branding on them. SFPs are a different animal, vendors qualify individual part numbers for support; you can even see different transceiver part number support between different switches from the same vendor.

  • Sorry, I mean FastEthernet switch With a GigabitEthernet SFP uplinks.
    – Alex
    Commented Mar 26, 2014 at 9:39
  • What part number is your Nexus? Which specific port are you trying to plug into? Commented Mar 26, 2014 at 9:41
  • I am not plugging atm. but I'm just researching if I can find an SFP transceiver (for 1Gbps connectivity) which is compatible with N5K's SFP+ ports. Thank you!
    – Alex
    Commented Mar 26, 2014 at 9:42

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