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About ExpressRoute scalable gateway (preview)

The ExpressRoute scalable gateway (ErGwScale) is a new virtual network gateway SKU that provides flexible, high-bandwidth connectivity for your Azure virtual networks. With support for up to 40-Gbps bandwidth and autoscaling capabilities, ErGwScale helps you efficiently manage network performance and scale resources to meet your workload needs. This article explains the features, configuration options, limitations, and performance details of the ErGwScale gateway.

Autoscaling vs. fixed scale unit

The virtual network gateway infrastructure autoscales between the minimum and maximum scale unit that you configure, based on the bandwidth or flow count utilization. Scale operations might take up to 30 minutes to complete. If you want to achieve a fixed connectivity at a specific bandwidth value, you can configure a fixed scale unit by setting the minimum scale unit and the maximum scale unit to the same value.

Upgrade and migration paths

You can move to the SKU ErGwScale using either an upgrade or migration process, depending on your current gateway SKU.

Upgrade options

  • If you have an existing gateway using the ErGw1Az, ErGw2Az, or ErGw3Az SKU, you can upgrade directly to the Scalable Gateway SKU. No migration tool is required.
  • Upgrades can be performed through the Azure portal or by using PowerShell.

This process may take up to 2 hours to complete. During this time, the gateway remains available and does not experience downtime.

Migration options

  • If your gateway uses the Standard, High Performance, or Ultra Performance SKU, you must use the migration Tool to move to ErGwScale.

Limitations

  • IPsec over ExpressRoute: ErGwScale currently doesn't support IPsec traffic over ExpressRoute.
  • Basic IP: ErGwScale doesn't support the Basic IP SKU. You need to use a Standard IP SKU to configure ErGwScale.
  • Minimum and maximum scale units: You can configure the scale unit for ErGwScale between 1 and 40. The minimum scale unit can't be lower than 1 and the maximum scale unit can't be higher than 40.

Supported performance per scale unit

Scale unit Bandwidth (Gbps) Packets per second Connections per second Maximum VM connections 1 Maximum number of flows
1-10 1 100,000 7,000 2,000 100,000
11-40 1 200,000 7,000 1,000 100,000

Sample performance with scale unit

Scale unit Bandwidth (Gbps) Packets per second Connections per second Maximum VM connections 1 Maximum number of flows
10 10 1,000,000 70,000 20,000 1,000,000
20 20 2,000,000 140,000 30,000 2,000,000
40 40 8,000,000 280,000 50,000 4,000,000

1 Maximum VM connections scale differently beyond 10 scale units. The first 10 scale units provide capacity for 2,000 VMs per scale unit. Scale units 11 and above provide 1,000 more VM capacity per scale unit.

Region availability

ErGwScale is available in most regions except the following regions:

  • Belgium Central
  • Japan East
  • Qatar Central
  • Southeast Asia
  • West Europe
  • West India
  • West US 2

Pricing

SKU Price per hour per scale unit
ErGwScale $0.21

For more information about ExpressRoute pricing, see Azure ExpressRoute pricing.

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