Edge Gateway Overview

What Is an Edge Gateway?

An edge gateway can connect subnets in the same VPC but from both edge and central AZs or from different edge AZs.

Edge gateways are supported in the AF-Johannesburg region.

Edge gateways are free of charge, but if there is a change, you will be notified in advance.

Application Scenarios

Figure 1 Edge gateway networking architecture

Table 1 lists the required two VPCs and 12 subnets in 12 AZs and five regions.

**Table 1** VPC and subnet planning
VPC	Subnet	AZ	Region
VPC-EG1	Subnet1	Edge AZ1	Edge region A
	Subnet2	Edge AZ2	Edge region A
	Subnet3	Edge AZ3	Edge region B
	Subnet4	Edge AZ4	Edge region B
	Centre-Subnet1	Central AZ1	Central region A
	Centre-Subnet2	Central AZ2	Central region A
VPC-EG2	Subnet5	Edge AZ5	Edge region A
	Subnet6	Edge AZ6	Edge region A
	Subnet7	Edge AZ7	Edge region C
	Subnet8	Edge AZ8	Edge region C
	Centre-Subnet3	Central AZ3	Central region B
	Centre-Subnet4	Central AZ4	Central region B

Table 2 lists the required edge gateway and five edge connections in 12 AZs and five regions.

**Table 2** Edge gateway and edge connection planning
Edge Gateway	AZ	Region	Edge Connection	Global Connection Bandwidth-HomeZones (CN East)
Edge gateway	Edge AZ1 Edge AZ2 Edge AZ5 Edge AZ6	Edge region A	Edge connection A	Global connection bandwidth A
	Edge AZ3 Edge AZ4	Edge region B	Edge connection B	Global connection bandwidth B
	Edge AZ7 Edge AZ8	Edge region C	Edge connection C	Global connection bandwidth C
	Central AZ1 Central AZ2	Central region A	Edge connection A-Central	Global connection bandwidth A-Central
	Central AZ3 Central AZ4	Central region B	Edge connection B-Central	Global connection bandwidth B-Central

The edge gateway is attached to both VPC-EG1 and VPC-EG2 and is used in the following scenarios.

**Table 3** Edge gateway application scenarios
Scenario	Required Resource	Description	Reference
In VPC-EG1, connect subnets in edge and central AZs.	VPC Subnet in an edge AZ Edge connection in an edge region Global connection bandwidth in an edge region Subnet in a central AZ Edge connection in a central region Global connection bandwidth in a central region	In VPC-EG1, Subnet1 in the edge AZ (AZ1) and Centre-Subnet1 in the central AZ (AZ1) need to communicate with each other. For the subnet in the edge AZ (AZ1), an edge connection (edge connection A) needs to be created in edge region A and has a global connection bandwidth (global connection bandwidth A) bound. For the subnet in the central AZ (AZ1), an edge connection (edge connection A-Central) needs to be created in central region A and has a global connection bandwidth (global connection bandwidth A-Central) bound.	Edge gateways: An edge gateway can have one or more VPCs attached. Associating VPCs with an Edge Gateway: The number of VPCs that an edge gateway can have vary by gateway edition. Creating an Edge Connection: An edge connection can be shared in all AZs of the same region. Binding a Global Connection Bandwidth to an Edge Connection: An edge connection can only have one global connection bandwidth bound.
In VPC-EG1, connect subnets in different edge AZs.	VPC Subnet in an edge AZ Edge connection in an edge region Global connection bandwidth in an edge region Edge connection in a central region Global connection bandwidth in a central region	In VPC-EG1, Subnet1 in the edge AZ (AZ1) and Subnet3 in the edge AZ (AZ3) need to communicate with each other. For the subnet in the edge AZ (AZ1), an edge connection (edge connection A) needs to be created in edge region A and has a global connection bandwidth (global connection bandwidth A) bound. For the subnet in the edge AZ (AZ3), an edge connection (edge connection B) needs to be created in edge region B and has a global connection bandwidth (global connection bandwidth B) bound. For both subnets, an edge connection (edge connection A-Central) needs to be created in central region A and has a global connection bandwidth (global connection bandwidth A-Central) bound. NOTE: To enable communications between a central region and an edge region or between different edge regions, you need to create an edge connection in the central region.	Edge gateways: An edge gateway can have one or more VPCs attached. Associating VPCs with an Edge Gateway: The number of VPCs that an edge gateway can have vary by gateway edition. Creating an Edge Connection: This edge connection is used for communications between the edge regions and a central region. Binding a Global Connection Bandwidth to an Edge Connection: An edge connection can only have one global connection bandwidth bound.
In VPC-EG2, connect subnets in edge and central AZs.	VPC Subnet in an edge AZ Edge connection in an edge region Global connection bandwidth in an edge region Subnet in a central AZ Edge connection in a central region Global connection bandwidth in a central region	In VPC-EG2, Subnet5 in the edge AZ (AZ5) and Centre-Subnet3 in the central AZ (AZ3) need to communicate with each other. For the subnet in the edge AZ (AZ5), an edge connection has been created in edge region A and has a global connection bandwidth bound. You can use this edge connection directly. For the subnet in the central AZ (AZ3), an edge connection (edge connection B-Central) needs to be created in central region B and has a global connection bandwidth (global connection bandwidth B-Central) bound. NOTE: Edge connections can be reused because VPC-EG1 and VPC-EG2 are attached to the same edge gateway.	Edge gateways: An edge gateway can have one or more VPCs attached. Associating VPCs with an Edge Gateway: The number of VPCs that an edge gateway can have vary by gateway edition. Creating an Edge Connection: VPCs attached to the same edge gateway can use one edge connection. In this example, only one edge connection needs to be created in the central region. Binding a Global Connection Bandwidth to an Edge Connection: An edge connection can only have one global connection bandwidth bound.
In VPC-EG2, connect subnets in different edge regions.	VPC Subnet in an edge AZ Edge connection in an edge region Global connection bandwidth in an edge region Edge connection in a central region Global connection bandwidth in a central region	In VPC-EG2, Subnet5 in the edge AZ (AZ5) and the subnet in the edge AZ (AZ7) need to communicate with each other. For the subnet in the edge AZ (AZ5), an edge connection has been created in edge region A and has a global connection bandwidth bound. You can use this edge connection directly. For the subnet in the edge AZ (AZ7), an edge connection (edge connection C) needs to be created in edge region C and has a global connection bandwidth (global connection bandwidth C) bound. For both subnets, an edge connection (edge connection B-Central) needs to be created in central region B and has a global connection bandwidth (global connection bandwidth B-Central) bound.	Edge gateways: An edge gateway can have one or more VPCs attached. Associating VPCs with an Edge Gateway: The number of VPCs that an edge gateway can have vary by gateway edition. Creating an Edge Connection: VPCs attached to the same edge gateway can use one edge connection. In this example, one edge connection is required for the edge AZ (AZ7), and one edge connection needs to be created in the central region. Binding a Global Connection Bandwidth to an Edge Connection: An edge connection can only have one global connection bandwidth bound.