The vRouter supports up to five virtual Ethernet interfaces. These are initialized when creating the VM (Virtual Machine) and are passed through to the vRouter.
If the number of interfaces is changed afterwards by conducting changes to the VM, the configuration of the vRouter cannot be rolled out via the LMC (LANCOM Management Cloud). This can happen when the size of the VM is changed in MS Azure.
LANCOM Systems recommends not to change the VM size for the vRouter afterwards. The size B2ms is sufficient for most use cases.