Azure ExpressRoute is a delivery method for your applications that helps you to bypass traditional network boundaries and deliver your applications to customers through a private network. With Azure ExpressRoute, you can create a dedicated virtual network in Azure that can deliver your applications to your customers with high performance and low latency.
Azure ExpressRoute operates using a couple of key components: the ExpressRoute Gateway (EG) and the ExpressRoute Service Gateway (ESG). The EG is in your data center and acts as the interface between your data center and the outside world.
The ESG is in your customer’s data center and acts as the interface between your customer’s data center and the ExpressRoute Gateway. .
The EG learns about your applications and their dependencies, and then creates a tunnel between your data center and the ESG. This tunnel is used to deliver your applications to your customers.
The EG also manages the traffic on the tunnel.
The EG is able to route traffic through the tunnel based on the application’s dependencies. If an application requires a dedicated connection to the internet, the EG will route the traffic through the tunnel to the ESG.
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If the application requires a connection to another ExpressRoute Gateway, the EG will route the traffic through the tunnel to the appropriate ExpressRoute Gateway.
The EG and ESG can be in different data centers. This allows you to have one EG in your data center and one or more ESGs in your customer’s data center.
The EG and ESG can also be in the same data center. This allows you to have a single EG in your data center and multiple ESGs in your customer’s data center.
The EG and ESG can also be in different geographic regions. This allows you to deliver your applications to customers in different regions.
The EG and ESG can also be in the same geographic region. This allows you to have a single EG in your data center and multiple ExpressRoute Gateways in your customer’s data center.
When you create an ExpressRoute connection, you specify the applications and dependencies that you want to deliver to your customers. The EG then creates a tunnel between your data center and the ESG.
The EG and ESG can also be in the same geographic region. This allows you to have a single EG in your data center and multiple ExpressRoute Gateways in your customer’s data center.
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