About ExpressRoute Virtual Network Gateways

Summary

To connect your Azure virtual network to your on-premises network with ExpressRoute, you need to create a virtual network gateway that exchanges IP routes and routes traffic. There are different types of gateways and SKUs, with higher SKUs providing better performance and capacity. Additionally, you must create a gateway subnet for the gateway VMs, and you can enable features like FastPath for improved traffic handling.

Highlights

Gateway SKU VPN Gateway and ExpressRoute coexistence FastPath Max Number of Circuit Connections Standard SKU/ERGw1Az Yes No 4 High Perf SKU/ERGw2Az Yes No 8 Ultra Performance SKU/ErGw3Az Yes Yes 16 ErGwScale (Preview) Yes Yes - minimum 10 of scale units 4 - minimum 1 of scale unit
8 - minimum of 2 scale units
16 - minimum of 10 scale units ([View Highlight] (https://read.readwise.io/read/01jcc4ehnpcgs79p5mfr769vsd))