@EN12 what are you intending to test, I think Meraki switches have loopback protection (apart from the MS390). I must admit in 25 years of networking to have never used one, an interesting idea though looks more like it would work better with a hub or unmanaged switch?
@cmr Thanks for the reply. The intention is to essentially verify the port is not causing errors. So using a dumb switch is a good idea and should perform the same function. My preference would be to have a small, light rj45 plug. Easily transportable, effective results.
When you mention 'loopback protection', is that in reference to broadcast-storm loops? I can't seem to find any Meraki docs on loopback plugs.