Dual hub BGP on loopback question

[AugustWest]

Howdy!

We're beginning a merger at my org and I need to re-IP my dual hub BGP on loopback schema. My first and biggest question would be, is it even possible to change the BGP and HC loopback as well as the IPsec tunnel IP's, add the new networks to BGP on one hub; say the secondary, update the spokes with the new config, and then once that is successful, repeat the process for the primary hub with little to no downtime?

I've been attempting to do this in a partial lab environment and I'm having issues with the spoke not loading the changed tunnel into the sdwan rule as a selected route even though from the hub, the new loop back and IPSec interface IPs are pingable to and from the spoke and hub. What I do find interesting is that if I keep the changes in place on the spoke but revert the actual tunnel interface IP back to the original address, it gets loaded into the sdwan rule even though the secondary hub head end tunnel is still the changed address which would be a completely different subnet. If anyone would like for me add some config, please let me know. I appreciate any assistance!

[Jean-Philippe_P]

Hello AugustWest, 

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible. 

[AugustWest]

Thank you. 

[Jean-Philippe_P]

Hello,

We are still looking for an answer to your question.

We will come back to you ASAP.