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
www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/release/notes/Rel_5_0_3_N1_1/Nexus5000
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 —
Another Reason
Another reason why you might see SFP Validation failed is you are inserting a 1G RJ45 SFP into a 10G SFP slot.
Hard Code the port to 1000 and the SFP will come online
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.
To see more Videos – Subscribe to my YouTube Channel
Hi I'm Roger.
I am CCIE #50038 in Routing & Switching and currently based in the UK working for a Cisco Gold Partner as a Senior Network & Security Consultant. About Roger
Contact Me | Twitter | Linkedin
awesome post man I was working on this for a while before I found your post.
Thanks for the tip Roger, like others I was scratching my head about the unsupported SFP type.
No worries, I was scratching my head with this one for a while also!