Hi @HectorM , Those are 10GBASE-SR (except the one at the bottom which is LR). If you check our SFP and stacking accessories doc, you'll see MS250 supports this SFP. I'm not a Cisco Catalyst or Nexus engineer, so I would check with Catalyst or Nexus support if your switch needs the commands @ww mentioned. This Catalyst doc has more details. # no errdisable detect cause gbic-invalid # service unsupported-transceiver Some older Catalyst firmware may have problems with those commands to support non-Cisco transceivers. Just make sure your OS image doesn't have any issues with those commands. In the other hand, Cisco Meraki dosn't have any restrictions to third-party transceivers. As per our doc, "Cisco Meraki offers branded SFP modules, and while we do not prevent third-party accessories from functioning, users should conduct their own tests to ensure proper compatibility" As @cmr said, checking the cable distance is a good idea; if it's below 300m I would double-check if the cable is the correct type. E.g.: MMF - OM3 instead of OM2 or OM1. Again, check this table to make sure your cable is correct. I suspect you did it but I'll say it anyway: test your SFPs in a switch that you know the SFP slot works fine. Next, try the known good SFPs in your deployment here. And then, try swapping the SFPs between your switches. E.g.: insert the purple tag SFP in the Cisco Switch and the white tag SFP in your MS250; if you don't get a link UP, invert them; keep doing this until you try all combinations. If all the above fails, then most likely your cable is damaged.
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