Cisco Nexus 5548 SFP Validation Failed

During a recent Nexus deployment I came across a very small problem which was very easily solved.

When doing a sh int brief on the Nexus 5548 I saw the following

Eth1/17       1      eth  access down    SFP validation failed       10G(D) –
Eth1/18       1      eth  access down    SFP validation failed       10G(D) –

The SFP’s that are in these slots were DS-SFP-FC8G SW

The reason is that in a Nexus 5548 the ports can either run as Ethernet or Fiber Channel. The default configuration is Ethernet.  To change the mode of the port

NX5548-SW1# conf t
Enter configuration commands, one per line.  End with CNTL/Z.
NX5548-SW1(config)# slot 1
NX5548-SW1(config-slot)# port 25-32 type fc
NX5548-SW1(config-slot)# end
NX5548-SW1# copy run start
[########################################] 100%
NX5548-SW1# reload

The Cisco doc is here

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/release/notes/Rel_5_0_3_N1_1/Nexus5000_Release_Notes_5_0_3_N1_1c.html#wp341614

Once the switch has reloaded the ports now show as FC and up!

fc1/31     1      auto   on      up               swl    F       8    –
fc1/32     1      auto   on      up               swl    F       8    –

Watch this blog over the next few months for more Nexus tips, the next challenge is FCOE to Netapp, I will also be pursuing the DCUFI certification.

 

Filed Under: Nexus Tagged With: , ,
About Roger Perkin

Roger Perkin is a 40 year old Cisco Engineer working for Cobham in the UK. He currently holds CCNP and CCSP. When not troubleshooting networks and studying for his CCIE he spends his time kite surfing, running, being a geek, travelling to Africa to support a school his wife has setup and spending time with his daughter.

Comments

  1. patrick baldwin says:
    June 26, 2012 at 6:00 pm

    awesome post man I was working on this for a while before I found your post.

  2. Kerry Thompson says:
    October 29, 2012 at 1:56 am

    Thanks for the tip Roger, like others I was scratching my head about the unsupported SFP type.

  3. Roger Perkin says:
    October 29, 2012 at 1:45 pm

    No worries, I was scratching my head with this one for a while also!

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