Mon Jul 12, 2021 4:28 am
For the archives, the SFP+ port in my CRS328 seemed to accept the 4 Gbit SFPs I tried in it, but the other end of the link is a hEX S with a regular old SFP port, and it didn't like them at all.
I had more luck with the 2 Gbit SFPs: they work in both MT boxes, and I got a solid gigabit iperf3 result through them.
I then tried a 4G FC SFP in the CRS328, leaving a 2G FC SFP in the hEX S, but they couldn't negotiate a connection.
I don't have another switch or router with an SFP+ port to try them in, and if I did, I'd want to put proper 10 Gbit SFPs in, so I'll be returning these 4G SFPs.