Hi there,

I have a quite basic question about the Mikrotik SFP+ switches. According to this wiki article, the Mikrotik SFP+ switches are downward compatible to 1G SFP. I need to setup a rack with 8 SFP+ connected servers (Intel X520s) and thus are looking for a switch (or two to be specific, as its a redundant setup). The CRS317 looks like a great fit for that, but in addition to these ports I would also need to connect four RJ45-based 100M management ports and thus would either add the Mikrotik S-RJ01 or the S+RJ10. (Adding another switch just for RJ45-stuff might work too, but given that rack space is spare, I would like to avoid that option.)

My question now: would using the cheaper 1G SFP modules (S-RJ01) harm the transmission speed of the other 10G SFP+ modules? In the block diagram of the CRS317 it looks like all ports are connected to one switch chip and I am not sure how exactly these chips work. Are these ports independent of each other, or would attaching 1G SFP modules downgrade the other modules to the smallest common denominator?

Thanks for every answer!

We use the 317 all over the place in our network, and we mix 10G and 1G optics (not just mikrotiks, but other vendors aswell) without any issue.

Thanks, thats all I needed to know.

I have 2- 1 gig sfp's that are from Ubiquiti. I tried to connect 2 switches, TP-Link 24port +4 sfp, and the CRS 317. Gig lights come on the TP-Link, no lights on the CRS317. Winbox shows the make, model and everything about this gbic. But, no connection...

OK.... After pouring over many posts and even unrelated issues, I believe that I have found the answer, and everything works! Simply uncheck the "auto negotiation" . Select 1Gps. Check full duplex. Done!