Which MikroTik switch can you use with 100M SFP modules?

Generally, 100M SFP modules can not be used with SFP+ ports. They sometimes can be used with SFP ports, however there is no guarantee it will work properly until you’ve actually tested the compatibility of the hardware!

Compatible devices

The MikroTik help page lists the CRS106-5S-1C as being compatible with both 100M and 1G SFP modules:

This unit is compatible with 100Mbit and 1.25G SFP modules

It has 5 SFP ports and 1 Combo SFP or GigE port.

Besides manually searching the MikroTik site for other compatible devices, I also used Google to search for similar sentences on the MikroTik site. I could not find any other MikroTik device for which any statement about 100Mbit SFP compatibility is being made.

Incompatible devices

For the following devices I have checked the respective MikroTik help page and it does not list compatibility with 100M SFP modules. This does not automatically mean they aren’t compatible but it’s much less likely. Possibly the help page will be updated in the future to indicate compatibility. I have not physically tested any of those devices with 100M transceivers.

  • CRS310-1G-5S-4S+IN
  • CRS112-8P-4S-IN
  • hEX S
  • CRS109-8G-1S-2HnD-IN
  • CRS212-1G-10S-1S+IN

Often, the help pages with read something like Compatible with 1.25G SFP modules. This means that standard 100Mbit SFP modules are incompatible.