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ExpressRoute virtual network gateway does not use an availability zone SKU Affecting Network service in Azure

Severity

0.0
medium
0
10
Severity Framework
Snyk CCSS
Rule category
Network/ Redundancy

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Frameworks
CIS-ControlsCSA-CCM
  • Snyk IDSNYK-CC-00461
  • creditSnyk Research Team
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Description

Consider deploying ExpressRoute gateways with an availability zone SKU to improve reliability of virtual network gateways.

How to fix?

When properties.gatewayType is set to ExpressRoute, set properties.sku.tier to ErGw1AZ, ErGw2AZ, or ErGw3AZ.

Example configuration:

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {},
  "resources": [
    {
      "type": "Microsoft.Network/virtualNetworkGateways",
      "apiVersion": "2021-03-01",
      "name": "arm-461-allowed2",
      "location": "West Europe",
      "properties": {
        "gatewayType": "ExpressRoute",
        "sku": {
          "name": "ErGw3AZ",
          "tier": "ErGw3AZ"
        }
      }
    }
  ]
}