Hey @DR1 ,   We're in a similar situation. 3 x MS225s distributed across three floors and we don't want to use up all the 10G SFP+ ports on the front of the switch as trunk up to the other switches from the one in the server room.   Based on what was suggested in the long post above, I should get away with these https://www.fs.com/uk/products/36157.html and this https://www.fs.com/uk/products/68017.html   I think? Either way, they're cheap enough that it should be an issue to try them out and see what happens.   Did you mange to try anything with QSFP+ over a fibre connection? Unfortunately I don't think I'll be able to offer any experience in the future on you endeavour to use QSFP28 transceivers as we don't have any in our switches. ... View more