Re: Connecting Meraki MS-425 with Cisco Legacy Switches with Fiber
1) Yes you can buy Meraki SFP modules and they will work with a Cisco one at the other end, so long as you use the same type e.g. 1000Base-SX to 1000Base-SX.
2) Normally there is no auto-negotiation in SFPs (there are few exceptions, but basically they don’t negotiate), you buy the speed you want, either 10Gbps or 1Gbps in the case of Meraki SFP+/SFP modules. A 10Gbps SFP+ module won’t run at 1Gbps.
3) You can definitely try and use a Cisco SFP in a Meraki switch, in most cases they work. Technically only the SFPs listed in Meraki documentation as supported are officially supported, but a lot of other SFP modules (including many third party ones) also work.