Tips and Tricks: (Part 1) Build Permanent Overlay Tunnels to 2 (or 3) Data Centers

 

 In a recent course when we spoke about Cloud-VPN and how to build permanent tunnels to a Data Center, students asked the very valid question:

"How can we build permanent tunnels if we have 2 Data Centers ?"

As normally only one DC will have permanent tunnels established

When defining 2 different Hubs only the preferred Hub (Order 1) will get a permanent Overlay tunnel established


But there is a second  possibility to select Hubs with a different order

When we choose Branch to Branch VPN via Hub and reverse the order of our 2 Hub locations

Now we have permanent tunnels to both DCs (DC1-Cluster and BR-3)


Alternative we can set Cloud-VPN up also in this way:

Again the branches will set up permant tunnel to both DCs (DC1-Cluster and BR-3)

The caveat here is, that we should have either cluster or high availaibilty chosen for the Hub selected aa Backhaul, as we do not have a second one for backup.

And by combining both setups we can even establish permanent tunnels to 3 DCs


 Now we have permanent tunnels to 3 DCs possible.

The only additional caveat is, that for the initial E2E traffic the 3rd DC will be used

In that way we achieve the goal of setting up permanent overlay tunnels to 2 or even 3 Data Centers

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