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How can I check the status of a fibre interface without configuring it?

at flag

With copper Ethernet you can see if there's a physical link even when the NIC is unused, i.e. is not configured with IP. With copper, 'ethtool ens802f0' will tell you "Link detected: yes" or "Link detected: no." This is not true of SFP+ interfaces, at least in the farm I support.

My question is, how can I quickly test the health of this a fibre connection without configuring it, without assigning an IP address? All of the fibre NICS in the network are physically wired to a switch but some are not configured and there may or may not be a corresponding port configured on the Cumulus switch at the other end of the cable.

Thanks for any advice.

djdomi avatar
za flag
please be more specific what test you wanna do.. currently the question is too broad
mr.zog avatar
at flag
I don't know what specificity you're looking for.
djdomi avatar
za flag
exactly - that's the issue - we don't understand your question.
jm flag
`ethtool` should work no matter if the connection is copper or fiber. The physical medium is at a level below what `ethtool` is capable of determining.
mr.zog avatar
at flag
Yes, I know that ethtool works with copper and fibre. ethtool can tell me whether the NIC exists but it makes the interface look physically broken when it's just unconfigured. _Or is it?_
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