[Network] Support summarized gateway prefixes in virtual network

[arjun-d-patel]

Related command
az network vnet and az network virtual-appliance

Is your feature request related to a problem? Please describe.
The Azure Network RP is adding new properties to the VirtualNetwork and VirtualNetworkAppliance resources in API version 2025-07-01. The CLI commands do not yet expose these new properties:

1. VirtualNetwork: A new property summarizedGatewayPrefixes (type: AddressSpace) has been added to VirtualNetworkPropertiesFormat. This provides a summarized list of advertised prefixes for the virtual network. It should be visible in az network vnet show/list output.

2. VirtualNetworkAppliance: A new property privateIPAddressVersion (type: string, values: IPv4 or DualStack, default: IPv4) has been added to VirtualNetworkAppliancePropertiesFormat. This controls whether the VNA is IPv4-only or Dual Stack.

3. VirtualNetworkAppliance: The bandwidthInGbps property type has been corrected from string to number.

Describe the solution you'd like

• az network vnet show/list/create/update should display summarizedGatewayPrefixes in the output.
• az network virtual-appliance create should accept a --private-ip-address-version parameter with allowed values IPv4 and DualStack.
• az network virtual-appliance show/list/create should display privateIPAddressVersion and bandwidthInGbps (as a number) in the output.

Describe alternatives you've considered
Users can use az rest to call the API directly, but native CLI support is preferred for discoverability and usability.

Additional context

• Swagger PR: Update vna and vnet properties to add PrivateIPAddressVersion and SummarizedGatewayPrefixes azure-rest-api-specs#40802
• API version: 2025-07-01
• Target resource types: Microsoft.Network/virtualNetworks and Microsoft.Network/virtualNetworkAppliances

[yonzhan]

Thank you for opening this issue, we will look into it.

[microsoft-github-policy-service]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @aznetsuppgithub.

[necusjz]

@arjun-d-patel what's the expected GA date? btw, as the swagger doesn't public yet, we can only relase it after its public.