I've got CSR309/CRS305 pair with S+RJ10 SFP+'s.
Is it possible to fix the interface data rate to 2.5G or 5G?
Right now it auto-negotiates to 10G but the cabling isn't really good enough. RouterOS (haven't checked SwOS) doesn't give much options;
[admin@crs309-office] /interface ethernet> set name=sfp-sfpplus1 speed=
1Gbps 10Gbps 10Mbps 25Gbps 40Gbps 100Mbps