Hi Tony, a) MX port connecting to C9300 in an access Transfer VLAN 10 with 2 IP's MX has 10.105.10.254, C9300 has 10.105.10.253 in a subnet of 10.105.10.252/30. b) there is only one 10G Fiber connection between those 2 devices, configured as an access port on both ends, both in VLAN 10 (transfer net). The C9300 takes care of the management VLAN 20, but either the MX nor the C9300 has a management IP from VLAN 20. With MS250-24 instead of C9300 exactly this config works fine in all other locations. I can ping from MX to C9300, but I can't ping from C9300 to MX and I can't ping to 8.8.8.8, but the C9300 is reachable from the Meraki Cloud and is online. So, I assume there is something different between C9300 and MS250 or other "legacy" Meraki Switches.
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