How to check FEX uplinks?

Hi all,

Does anyone how to verify the uplinks between parent Nexus 5Ks and 2K fabric extenders? I would usually use CDP or UDLD to confirm neighbours on a link but this does not seem possible on FEX uplinks.

For example if I have:

Nexus 5K             Nexus 2K

Eth1/1---------------FEX uplink 1

Eth1/2---------------FEX uplink 2

How can I check (without nipping in the data centre and tracing cables) that the links are not crossed over between uplink port 1 and 2?

Thanks