I’m unable to get any SFP port working. Tested with two different brands of optical SFP modules. Everything works well when I put the module into a different unmanaged switch: link is up, and I can communicate with the other end by IP.
But on CRS-212, link went up only after I switched auto negotiation off on the port. Then the link is up on both ends, and I can see the other end led blinking which probably means there’s some data passed from CRS. TX counters on CRS are increasing, but RX counters and RX power are zero. This behaviour seems to not depend on the sfp settings (speed, duplex, tx/rx flow control). I did not yet tried to switch auto negotiation off on the other end, and I’m unsure if it’s possible at all.
I also have tried different ports of the device (including sfp+ one).
I currently use web interface for diagnostics. Is it worth to try command line to get more sfp diagnostics? Is it worth to downgrade to an older RouterOS release?
First off, if you are not using Mikrotik SFPs, they may not not be fully compatible. Also with Mikrotik, the SFP ports are 1.25Gb, where as on a lot of other manufactures they are simply 1Gb. That means you will typically means you will want to manually configure the ports.
When it comes to an sfp+ port, that is of course a 10Gb port and you would have to manually set it to 1Gb if you were connecting it to another 1Gb port. I’m still fairly new to Mikrotiks myself, Cisco background, so what I have provided is based on my experience and research.
So if the port comes up/up after autonegotiation is turned off, that is your first key that you will have to go that route to achieve your desired results. You will need to manually set the speed and duplex settings on both sides. See if you can get your counters to increment after that.
If you can provide more details on what device is on each end, config examples of the ports and what sfp tranceivers you are using, I’m sure we can get this figured out for you.