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Hello,
I need to setup a VPN from Azure to GCP with BGP enabled from both sides. I'm setting up the lab with Terraform and I could see that tunnels are up but BGP session is not being established from the GCP router. Any suggestion? Thank you 
Hello Christian, Thank you so much for your answer. It seems that what you have observed it's correct.
You say that I have to enable APIPA, then I added a custom Azure APIPA BGP with address 169.254.21.11
I found this documentation: "By default, Azure assigns a private IP address from the GatewaySubnet prefix range automatically as the Azure BGP IP address on the Azure VPN gateway. The custom Azure APIPA BGP address is needed when your on premises VPN devices use an APIPA address (169.254.0.1 to 169.254.255.254) as the BGP IP."
So as far as I understand in order to enable the connection to GCP it's a requirement to have APIPA?
The part that I don't get it's if I have to use the APIPA address on the GCP router side to create the BGP peering session.
I have found much information about VPN between AWS and GCP but not for Azure, maybe it's due to the APIPA conf
