[FS#883] ER-X-SFP link-state enabled on SFP port eth5 (led = lit) but swconfig reports link:down

[LEDE Bugs]

The following task has a new comment added:

FS#883 - ER-X-SFP link-state enabled on SFP port eth5 (led = lit) but swconfig reports link:down
User who did this - Torbjörn Jansson (tobbe)

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i got the same problem.
would be nice to get this solved since i was using my sfp port before i switched to lede.
it was not obvious in the beginning that port is not working even when the link led turns on.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=883#comment3011