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Thank you for the nice step-by-step article! I just tried the steps mentioned in the article. So, from the Azure side when we are creating a virtual network gateway, we are disabling BGP. But, from AWS side when we are creating a customer gateway with the public IP of the Azure Virtual network gateway, we cannot disable BGP. If BPP related text field is left blank, then it is asking me to enter something, as shown in the screenshot below. So, It cannot be left blank. Not sure how BGP did not appear in the screenshot that you provided for configuring CGW in AWS.
Now, if I enable BGP ( by providing a BGP ASN as 65001) then will it be able to communicate with Azure once the Virtual private gateway is set up and attached to the corresponding VPC? If not, then how to make the connectivity work?