I'm currently unsure of what "A-End" is referring to and what the VLAN's function is in this context,
A-End is your datacenter location. Azure would be the B-End in this video.
How you configuring Azure Expressroute in resilient manner (using primary and secondary). Not referring to creating 2 separate VXC.
Vlan is used as the CTag in VXLan encapsulation
Can you enable or disable virtual routing using timely basis ( or scheduled window) using VXC to Azure peer. Trying to achieve scheduled connection between on prem and azure network. Pls let us know if that can only be achievable using API or Terraform.