Still an issue, let me explain : i have multiple vlans : vlan 1 : All the telcos (Switches, routers,...) vlan 2 : All my servers (DNS, AD, DHCP,...) vlan 3 : All my clients vlan 4 : my WiFi vlan 5 : iP phones vlan 6 : Security devices (Cameras, cards scanners,...) When i activate the multicasting on the vlan 6 i loose connectivity in all my vlans, mean that no one is any more able to communicate with the vlan 2 and 1... Why do i need multicasting ? To optimise the trafic that is generated in the vlan 6 and fron the vlan 6 to others. I'm following what is explained in : https://documentation.meraki.com/MS/Layer_3_Switching/MS_Multicast_Routing_Overview
... View more