1. is it doable to assign both edge VM and ESXi7.0 TN to the same TEP(VLAN)?? or they must to use separate TEP?
If this is home lab or POC , you can certainly configure a single VLAN for all types of traffic. It works even for multisite design.
2. is the "eth0" interface undeletable and fixed with vNIC1??
Eth0 must be assigned to management interface , however other interfaces can be assigned to overlay or VLAN networks.
your answers are quite helpful~!!!
by the way, I would like to solve a doubt on the Edge tunnel endpoint which is,
is the Edge "TEP" same as other transport nodes' TEP(ESXi, KVM...etc) that are all in charge of the overlay network?
Yes, from a functionality perspective Edge TEP and Host TEP are same.