@Eddy_X were you getting 10-15 success, then 30-60 seconds of failure in a repeated pattern?  We had that when we tried 12.28 on some MR355s where there were other Cisco IOS switches in the LAN.  We tried all the usual spanning tree fixes with support, but reverting to 14.21 firmware that support had asked us to downgrade from (along with some STP changes) fixed it.   Or is there a particular reason why you are running somewhat old (18 months+) firmware? ... View more

So I have Startech and Tripplite SFP+ modules. They both worked (mixed) in my 1st link from server room in main building to my IT office. 10GB no problem.   The configuration is as such: Meraki MS220 switch -> StarTech SFP+ module -->--> Tripplite SFP+ module -> Netgear ProSafe Switch   When the two new buildings went up and fiber was run to them, I bought 2 each of the same StarTech and Tripplite modules. Those did work to get another building up. They did not work to get the 3rd building connected. 3rd building is currently using copper until I can figure it out.   My inventorying is bad. But I think I've found a spare switch to try. I"ll be able to try this on Thursday when back ... View more

The only downside of using a stack is when you do a firmware upgrade both stack members need to reboot at the same time.  So you will get an outage.   If you are able to schedule in a 5-minute outage window every 6 months for the firmware upgrades the stack is the better option. ... View more