Hi Hieu,   There are currently no known bugs relating to Fiber ports and multicast. The MS210 is very similar to the MS225 (hence why they are stacking compatible), and if a bug exists on the MS210, it should also exist on the MS225. The only similarity between the MS120 and the MS210 is the 1G SFP ports. Are you currently testing the MS225 with the same SFP module you have used on the MS120 and MS210? ... View more

William, have you taken a look at our MS350-24X switches?  These switches provide Multigigabit Ethernet connectivity, which will provide 10Gbps over Cat6 copper cables, as defined by the NBASE-T Alliance.     More information can also be found here: https://meraki.cisco.com/technologies/multigigabit ... View more