IMHO, extending L2 to cloud is a mad-man's game.
You might wanna look at IPmotion (https://docs.aviatrix.com/HowTos/ipmotion.html).
 

I understand it bit tricky & challenging to extend L2 into cloud. But does this Aviatrix solution works with Azure as well?

Bharat Batra yes, Aviatrix works with Azure, AWS, GCP, and OCI. This doc page has a table that shows you which Aviatrix capabilities are supported in each of the clouds: Aviatrix Overview — aviatrix_docs documentation

Hello, just wanted to follow this discussion. We could have customer who need to move onprem workload to public cloud keeping the same IP subnet. So the layer 2 extension is well suited for temporary situation. I saw that the link https://docs.aviatrix.com/HowTos/ipmotion.html is broken, does Aviatrix provide solution for that ? thanks.