Problems with SFP module in DEC750

[TechTree]

Hi there forum!

I'm having some interesting problems with my (ISP supplied) SFP module (not SFP+ mind you) in my DEC750. I knew from the get-go that it would probably not be as plug-and-play as it was in my old USG 4 Pro, the port being SFP+ and all, but what I've encountered is somewhat beyond me.

I've determined that the SFP module is supposed to run at 1000baseLX (see spec sheet below), and it is quite possible to get it up and running. But it requires some manual work. I've set the module, in `ax0` to run at the specified speed/duplex:
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But after (re-)booting it looks like this in the console;
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Specifically the `media: Ethernet autoselect` and `status: no carrier` are a bit troubling, for I hope obvious reasons.
The workaround I've been able to come up with is to set the s/d to 1000Base-KX;
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which gives me a carrier, but no connectivity. (I'm guessing the final lines are just remnants from previous successful DHCP requests as I re-created the errors and fixes a few times.) Then switching back to 1000baseLX I get both a carrier and proper connectivity until reboot;
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Things I've tried so far;

• Going from `autoselect` to `1000baseLX` ❌
• Going from `autoselect` to `1000base-SGMII` ❌
• Going from `autoselect` to `1000baseSX` ❌
• Going from `1000base-SGMII` to `1000baseLX/code] ❌
• Setting `1000Base-KX` rebooting and then selecting `1000baseLX` ❌

So, if I've not been clear about what my problem is; I can, after some workarounds, get the link up and working, but I'd like to not have to as it stops me from retiring the USG 4 Pro and switching over the DEC750. I'm fine with having to do some automated post-ax0-up-scripting if that would solve my issue, but I've not found a straightforward way to change the s/d setting via the CLI or where I'd put a script to do it 😅
Thoughts? Idea? Suggestions? Dare I say, solutions? 😁

Thank you for your time regardless!

SFP module spec sheet, if that matters 😉

[pfry]

"ifconfig ax0 media 1000baseLX" may work from CLI/shell. Why poking the media type twice helps is odd - it may make setting the options in (e.g.) rc.conf (ifconfig_ax0 "media ...") a bit problematic, unless the options/commands are just fired in sequence.

I wouldn't expect any functional difference between "1000baseSX"/"...LX"/"...CX" or even "...KX", but KX might have some differences due to its use as a backplane interface. I could see the speed being an issue, potentially.

The Hexatronic module might have specific quirks built into the driver phy section... you'd have to dig into the interface driver used on the Ubiquiti. Seems a bit unlikely, but you never can tell.

[TechTree]

Hmm, I'm gonna have to try that and see what happens 😊 I'll report back on the results when I can find 2 minutes to rub together and do the work 😉
Cheers!

[TechTree]

Ok, so I tried some things. But no love.

First off; I was thinking I should fiddle around a bit "on bench" (because I can't sit very comfortably within reach of the other networking equipment and the fiber) to see if I could find something out. To my surprise ax0 was configured as 1000baseLX on boot! 🎊🥳🎉 No carrier obviously, because the fiber is on different floor.

So I plugged everything in where it should be, and - nothing. Back to "autoselect" and no carrier. I tried poking ax0 via the CLI. From autoselect to LX went as expected; nothing. Setting KX then LX worked insofar that the link showed as a-ok, but I couldn't get a DHCP lease. No biggie, I thought, it's probably some ISP shenanigans with not allowing multiple leases on the same line or some such. Just release the lease on the USG and re-acquire on DEC. NOPE! No more DHCP leases for me!

Ok - maybe OPNSense does something when doing things via the GUI? Reboot - fiddle with the GUI - no DHCP 🤬

So now I'm actually one step further away from a working device than I was before 😭 Contemplating trying to get a different SFP module. I know (from work) that they can be a bit temperamental at times, but my searches for a replacement have been - ambiguous. (https://www.fs.com/eu-en/products/20140.html?attribute=10440&id=3952148 is probably ok? According to the spec sheet it shouldn't burn out the ISP side at least 😉) Or maybe getting a "dumb" media converter. But I'd really prefer to use the SFP port on the DEC for internet so I can have both my 2 port LAGG and a dedicated management port, which I've already tentatively configured. Can someone suggest a resonable course of action? I'm really at my wits end here, I feel.
(Using the ISP supplied media converter is - problematic. It's screwed onto the wall in a relatively bad spot, and has been partially painted over. I'm not keen on having to re-paint the walls just for this 😅)