Add HighSpeedInterconnectPlacement parameter to VMSS cmdlets

[Copilot]

Description

Adds -HighSpeedInterconnectPlacement parameter to New-AzVmss and New-AzVmssConfig cmdlets to control Infiniband network interconnect for RDMA VM sizes. Supports values: None (opt-out) or Trunk (enable).

Changes

• New-AzVmss: Added -HighSpeedInterconnectPlacement parameter to SimpleParameterSet, integrated into both Uniform and Flexible orchestration modes
• New-AzVmssConfig: Added -HighSpeedInterconnectPlacement parameter with property binding to PSVirtualMachineScaleSet
• VirtualMachineScaleSetStrategy: Updated both CreateVirtualMachineScaleSetConfig and CreateVirtualMachineScaleSetConfigOrchestrationModeFlexible to pass parameter through to SDK model
• Tests: Added Test-SimpleNewVmssHighSpeedInterconnectPlacement and Test-VmssConfigHighSpeedInterconnectPlacement

Usage

# Enable high-speed interconnect
New-AzVmss -VMScaleSetName "MyVMSS" -Credential $cred -HighSpeedInterconnectPlacement "Trunk"

# Configure via VMSS config object
$config = New-AzVmssConfig -Location "West US 2" -HighSpeedInterconnectPlacement "None"

SDK property already present in Microsoft.Azure.Management.Compute.Models.VirtualMachineScaleSet. Requires API version 2025-04-01+.

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add highSpeedInterconnectPlacement property in VMSS</issue_title>
<issue_description>

Guidelines

The purpose of the Azure PowerShell design review is to ensure that the cmdlets follow the same pattern across the Azure modules. An early design review reduces the risk of unnecessary implementation changes caused by a cmdlet syntax design change.

Please ensure your cmdlets comply with the design guidelines outlined in the PowerShell Design Guidelines document.

Please generate cmdlets syntax using GenerateCmdletDesignMarkdown.ps1 for review if your cmdlet is generated from API spec directly by Autorest.PowerShell.

If you just add parameter to existing cmdlets and parameter definition complies with guideline, the design review is not expected.

• Have you read above statement?

  • Yes

Service Release Details

• Is this an Embargoed Preview, A Public Preview, or a General Release?

  • General Release

• What is the expected service release date?

  • { EXPECTED RELEASE DATE HERE }

• Which Powershell module are these changes being made in?

  • Az.Compute

Contact Information

• Main developer contacts (emails + github aliases)

  • mitaligupta@microsoft.com

• PM contact (email + github alias)

  • NA

• Other people who should attend a design review (email)

  • NA

High Level Scenarios

• Describe how your feature is intended to be used by customers.

  • The HighSpeedInterconnectPlacement property allows customers to enable/opt out of Infiniband network interconnect between RDMA VM sizes.

• Piping scenarios / how these cmdlets are used with existing cmdlets

  • These are existing cmdlets and the new feature parameter will not change the piping scenarios.

• Sample of end-to-end usage

  • Please provide comprehensive examples that don't assume additional setup. It helps the audience understand your feature.

Syntax changes

Indicate if you are requesting an edit to existing cmdlets, adding new cmdlets, or both. Then edit the corresponding section below.

Expecting to add something like -HighSpeedInterconnectPlacement to the New-AvVMSS cmdlet:
Update the Full parameter set to add HighSpeedInterconnectPlacement

New-AzVmss
   [[-ResourceGroupName] <String>]
   [-VMScaleSetName] <String>
   [-AsJob]
   [-ImageName <String>]
   -Credential <PSCredential>
   [-InstanceCount <Int32>]
   [-VirtualNetworkName <String>]
   [-SubnetName <String>]
   [-PublicIpAddressName <String>]
   [-DomainNameLabel <String>]
   [-SecurityGroupName <String>]
   [-LoadBalancerName <String>]
   [-BackendPort <Int32[]>]
   [-Location <String>]
   [-VmSize <String>]
   [-UpgradePolicyMode <UpgradeMode>]
   [-AllocationMethod <String>]
   [-VnetAddressPrefix <String>]
   [-SubnetAddressPrefix <String>]
   [-FrontendPoolName <String>]
   [-BackendPoolName <String>]
   [-SystemAssignedIdentity]
   [-UserAssignedIdentity <String>]
   [-EnableUltraSSD]
   [-Zone <System.Collections.Generic.List`1[System.String]>]
   [-NatBackendPort <Int32[]>]
   [-DataDiskSizeInGb <Int32[]>]
   [-ProximityPlacementGroupId <String>]
   [-Priority <String>]
   [-EvictionPolicy <String>]
   [-MaxPrice <Double>]
   [-ScaleInPolicy <String[]>]
   [-SkipExtensionsOnOverprovisionedVMs]
   [-DefaultProfile <IAzureContextContainer>]
   [- OrchestrationMode <String>] 
   ** [-HighSpeedInterconnectPlacement <HighSpeedInterconnectPlacement>] **
   [-SinglePlacementGroup]
   [-WhatIf]
   [-Confirm]
   [<CommonParameters>]

Also add highSpeedInterconnectPlacement mode to New-AzVmssConfig

New-AzVmssConfig
   [[-Overprovision] <Boolean>]
   [[-Location] <String>]
   [[-Tag] <Hashtable>]
   [[-SkuName] <String>]
   [[-SkuTier] <String>]
   [[-SkuCapacity] <Int32>]
   [[-UpgradePolicyMode] <UpgradeMode>]
   [[-OsProfile] <VirtualMachineScaleSetOSProfile>]
   [[-StorageProfile] <VirtualMachineScaleSetStorageProfile>]
   [[-NetworkInterfaceConfiguration] <VirtualMachineScaleSetNetworkConfiguration[]>]
   [[-Extension] <PSVirtualMachineScaleSetExtension[]>]
   [-SkipExtensionsOnOverprovisionedVMs]
   ** [-HighSpeedInterconnectPlacement <HighSpeedInterconnectPlacement>] **
   [-OrchestrationMode <String>] 
   [-SinglePlacementGroup <Boolean>]
   [-ZoneBalance]
   [-PlatformFaultDomainCount <Int32>]
   [-Zone <String[]>]
   [-PlanName <String>]
   [-PlanPublisher <String>]
   [-Pla...

</details>


> **Custom agent used: Powershell PR agent**
> This agent creates a Powershell PR

- Fixes Azure/azure-powershell-cmdlet-review-pr#1500

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