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Since we ahve primary data center (DC) is already connected to Azure via ExpressRoute, options for connecting your on-premises DR datacenter to Azure

Sathish S 20 Reputation points
2024-06-20T17:31:14.1433333+00:00

We have DC and DR datacenters at the on-prem level and the On-prem datacenter was connected to Azure through the Azure Express route and What are the other options we can get to connect Azure to the on-prem DR datacenter, how to establish connectivity between DR on-prem datacenter when DC main datacenter goes down,

1.      can we use S2S connectivity for DR on-prem data center as a backup?

2.      Or can we go for express route connectivity between DR on-prem datacentre as a backup?

Which is the best option?

And we are already using the one gateway subnet for the express route to connect the DC on-prem datacentre, and with the same gateway subnet can we establish connectivity between DR on-Prem datacentre?

How to configured S2S VPN or secondary ExpressRoute connection will automatically take over, routing traffic between your DR datacenter in Azure.

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  1. ChaitanyaNaykodi-MSFT 26,216 Reputation points Microsoft Employee
    2024-06-21T02:04:54.61+00:00

    @Sathish S

    Thank you for reaching out.

    I understand that you have DC and a DR datacenters on-prem you wish to know what the best option will be to enable connectivity with DR data center when the DC datacenter goes down.

    I think the best option here will be to set-up an express route connectivity using the Any-to-any (IPVPN) network model so that Microsoft cloud can be interconnected to your WAN to make it appear like any other branch office. You can influence Azure to prefer one ExpressRoute circuit over another one using one of the following techniques (listed in the order of effectiveness):

    • advertising more specific route over the preferred ExpressRoute circuit compared to other ExpressRoute circuit(s)
    • configuring higher Connection Weight on the connection that links the virtual network to the preferred ExpressRoute circuit
    • advertising the routes over less preferred ExpressRoute circuit with longer AS Path (AS Path prepend)

    More information can be found here

    In order to provide additional redundancy you can use a site-to-site VPN as a backup for private peering traffic.

    Hope this helps! Please let me know if you have any additional questions. Thank you!

    ​​Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

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