Express Route circuit accessible from other (paired) region.

Question

Hello,

We need to write a DR plan and we only have one single ER circuit.

My question is: can we create another ER Gw (with the same settings as the first one) in the paired region (if the whole main region goes down) to access the onprem resources? I would like to know if there is a possibility of tapping into the same ER circuit from other (paired) region. My thoughts are that the azure end of the ER terminates somewhere at the edge routers that are shared between regions but I could not find anywhere on the MS docs.

I know there are possibilities to achieve this with multiple ER circuits or even with a VPN gateway in the second region.

[Note: As we migrate from MSDN, this question has been posted by an Azure Cloud Engineer as a frequently asked question] Source: Microsoft Learn

Answer 1

As is Discussed Here, ExpressRoutes are terminated at a co-location facility. They should not be affected by datacenter outages, as long as the outage reason is within the datacenter itself. Azure uses as much resiliency and redundancy as possible within its network.
Creating connections to multiple datacenter regions within the Geopolitical region can give you additional resiliency in the event of a datacenter outage, but you still have the single point of failure of the ExpressRoute itself and the co-location facility.

Source: Microsoft Learn