We are running a Cisco Classic network with Cisco Catalyst switches. They are running with PVST. But we connected Meraki-Switches without any issues. You need to have VLAN1 as standard VLAN. And don´t connect Cisco classic, Meraki, and again Cisco Classic in a row. In the end our core and some distri-switches are Cisco classic and userswitches are Meraki. https://documentation.meraki.com/MS/Deployment_Guides/Advanced_MS_Setup_Guide
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