What is the significance of the Azure VLAN Id when configuring the Primary and Secondary subnet (two /30s) on the portal? Using your example, is the on-prem router peering its primary subnet on vlan 305 and secondary subnet on vlan 306? I don't understand what is VLAN 200 used for in this case. Thanks
305 & 306 are STAGs. 200 is a CTAG.