AllowMultipleAddressPrefixesOnSubnet not available

[arjun-virmani]

[Enter feedback here]

Multiple address prefixes feature not allowed as of now, so it should be removed, terraform reference to this should also be edited. It is not even in preview. AllowMultipleAddressPrefixesOnSubnet feature needs to be registered for this, which isn't allowed as of now.

Document Details

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• ID: 385e420c-4bd0-3ddd-d9cd-a9a411ec1f7b
• Version Independent ID: 65172372-f485-3d2b-64aa-57c38ac11538
• Content: az network vnet subnet
• Content Source: latest/docs-ref-autogen/network/vnet/subnet.yml
• Service: virtual-network
• GitHub Login: @rloutlaw
• Microsoft Alias: routlaw

[yonzhan]

network

[JLunda]

I am experiencing this issue with this feature and have attempted this:

az feature register --namespace Microsoft.Network -n AllowMultipleAddressPrefixesOnSubnet --subscription <subscriptionId>

Using az feature show --namespace Microsoft.Network -n AllowMultipleAddressPrefixesOnSubnet --subscription <subscriptionId>, I can see the registration is in status Pending, but I am interested in why the original reporter of this issue says the feature is not allowed and in an estimated timeframe by which this feature is expected to reach Registered status.

Thank you!

[arjun-virmani-by]

I am experiencing this issue with this feature and have attempted this:

az feature register --namespace Microsoft.Network -n AllowMultipleAddressPrefixesOnSubnet --subscription <subscriptionId>

Using az feature show --namespace Microsoft.Network -n AllowMultipleAddressPrefixesOnSubnet --subscription <subscriptionId>, I can see the registration is in status Pending, but I am interested in why the original reporter of this issue says the feature is not allowed and in an estimated timeframe by which this feature is expected to reach Registered status.

Thank you!

Hi Jordan,

I spent some couple of days on the same issue. Seems like Terraform has this in documentation on the basis of azure documentation, which is incorrect in the first place.

After going back and forth with Azure support that this feature isn't even in preview by then(not sure of now), they mistakenly showed it in the documentation and features. Its for internal engineers use, as per them. Enclosing the screenshot.

Thanks.

[JLunda]

Thanks for the additional information, @arjun-virmani-by. I can confirm that I have tried via AZ CLI and ARM template and this feature fails both ways. I also spent some time talking to Azure Support and was likewise informed that this feature is not ready for General Availability (GA). I would second the need for the documentation to have a note that conveys this information or to be modified not to mention the ability to pass multiple address prefixes, since it is not ready yet. Thanks!

[Lau-rawr]

any update?

[chrisswinford]

This feature is now in public preview in Azure in all public cloud regions:

• https://techcommunity.microsoft.com/t5/azure-networking-blog/public-preview-create-multiple-prefixes-for-a-subnet-in-an-azure/ba-p/4171141
• https://learn.microsoft.com/en-us/azure/virtual-network/how-to-multiple-prefixes-subnet?tabs=powershell