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Applies to: Windows Server (Semi-Annual Channel), Windows Server 2016
In this topic, we provide you with the instructions to configure Converged NIC with a single NIC in your Hyper-V host.
The example configuration in this topic describes two Hyper-V hosts, Hyper-V Host A, and Hyper-V Host B. Both hosts have a single physical NIC (pNIC) installed, and the NICs are connected to a top of rack (ToR) physical switch. In addition, the hosts are located on the same subnet, which is 192.168.1.x/24.
Step 1. Test the connectivity between source and destination
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Ensure that the physical NIC can connect to the destination host. This test demonstrates connectivity by using Layer 3 (L3) - or the IP layer - as well as Layer 2 (L2).
View the network adapter properties.
Results:
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Name InterfaceDescription ifIndex Status MacAddress LinkSpeed M1 Mellanox ConnectX-3 Pro .. 4 Up 7C-FE-90-93-8F-A1 40 Gbps
View additional adapter properties, including the IP address.
Results:
Step 2. Ensure that source and destination can communicate
In this step, we use the Test-NetConnection Windows PowerShell command, but if you can use the ping command if you prefer.
Tip
If you're certain that your hosts can communicate with each other, you can skip this step.
Verify bi-directional communication.
Results:
Parameter Value ComputerName 192.168.1.5 RemoteAddress 192.168.1.5 InterfaceAlias M1 SourceAddress 192.168.1.3 PingSucceeded True PingReplyDetails (RTT) 0 ms
In some cases, you might need to disable Windows Firewall with Advanced Security to successfully perform this test. If you disable the firewall, keep security in mind and ensure that your configuration meets your organization's security requirements.
Disable all firewall profiles.
After disabling the firewall profiles, test the connection again.
Results:
Parameter Value ComputerName 192.168.1.5 RemoteAddress 192.168.1.5 InterfaceAlias Test-40G-1 SourceAddress 192.168.1.3 PingSucceeded False PingReplyDetails (RTT) 0 ms
Step 3. (Optional) Configure the VLAN IDs for NICs installed in your Hyper-V hosts
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For this step, the NICs are in ACCESS mode. However, when you create a Hyper-V Virtual Switch (vSwitch) later in this guide, the VLAN properties are applied at the vSwitch port level.
Because a switch can host multiple VLANs, it is necessary for the Top of Rack (ToR) physical switch to have the port that the host is connected to configured in Trunk mode.
Note
Consult your ToR switch documentation for instructions on how to configure Trunk mode on the switch.
The following image shows two Hyper-V hosts, each with one physical network adapter, and each configured to communicate on VLAN 101.
Important
Perform this on both the local and destination servers. If the destination server is not configured with the same VLAN ID as the local server, the two cannot communicate.
Configure the VLAN ID for NICs installed in your Hyper-V hosts.
Important
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Do not run this command if you are connected to the host remotely over this interface, because this results in loss of access to the host.
Results:
Name DisplayName DisplayValue RegistryKeyword RegistryValue M1 VLAN ID 101 VlanID {101}
Restart the network adapter to apply the VLAN ID.
Ensure the Status is Up.
Results:
Name InterfaceDescription ifIndex Status MacAddress LinkSpeed M1 Mellanox ConnectX-3 Pro Ethernet Ada.. 4 Up 7C-FE-90-93-8F-A1 40 Gbps
Important
It might take several seconds for the device to restart and become available on the network.
Verify the connectivity.
If connectivity fails, inspect the switch VLAN configuration or destination participation in the same VLAN.
Step 4. Configure Quality of Service (QoS)
Note
You must perform all of the following DCB and QoS configuration steps on all hosts that are intended to communicate with each other.
Install Data Center Bridging (DCB) on each of your Hyper-V hosts.
- Optional for network configurations that use iWarp for RDMA services.
- Required for network configurations that use RoCE (any version) for RDMA services.
Set the QoS policies for SMB-Direct:
- Optional for network configurations that use iWarp.
- Required for network configurations that use RoCE.
In the example command below, the value “3” is arbitrary. You can use any value between 1 and 7 as long as you consistently use the same value throughout the configuration of QoS policies.
Results:
Parameter Value Name SMB Owner Group Policy (Machine) NetworkProfile All Precedence 127 JobObject NetDirectPort 445 PriorityValue 3
For RoCE deployments, turn on Priority Flow Control for SMB traffic, which is not required for iWarp.
Results:
Priority Enabled PolicySet IfIndex IfAlias 0 False Global 1 False Global 2 False Global 3 True Global 4 False Global 5 False Global 6 False Global 7 False Global
Enable QoS for the local and destination network adapters.
- Not needed for network configurations that use iWarp.
- Required for network configurations that use RoCE.
Results:
Name: M1
Enabled: TrueCapabilities:
Parameter Hardware Current MacSecBypass NotSupported NotSupported DcbxSupport None None NumTCs(Max/ETS/PFC) 8/8/8 8/8/8
OperationalTrafficClasses:
| TC | TSA | Bandwidth | Priorities |
|---|---|---|---|
| 0 | ETS | 70% | 0-2,4-7 |
| 1 | ETS | 30% | 3 |
How Vlan Tagging Works
OperationalFlowControl:
Priority 3 Enabled
OperationalClassifications:
| Protocol | Port/Type | Priority |
|---|---|---|
| Default | 0 | |
| NetDirect | 445 | 3 |
Reserve a percentage of the bandwidth for SMB Direct (RDMA).
In this example, a 30% bandwidth reservation is used. You should select a value that represents what you expect your storage traffic requires.
Results:
Name Algorithm Bandwidth(%) Priority PolicySet IfIndex IfAlias SMB ETS 30 3 Global
View the bandwidth reservation settings.
Results:
Name Algorithm Bandwidth(%) Priority PolicySet IfIndex IfAlias [Default] ETS 70 0-2,4-7 Global SMB ETS 30 3 Global
Step 5. (Optional) Resolve the Mellanox adapter debugger conflict
By default, when using a Mellanox adapter, the attached debugger blocks NetQos, which is a known issue. Therefore, if you are using an adapter from Mellanox and intend to attach a debugger, use the following command resolve this issue. This step is not required if you do not intend to attach a debugger or if you're not using a Mellanox adapter.
Step 6. Verify the RDMA configuration (Native host)
You want to ensure that the fabric is configured correctly prior to creating a vSwitch and transitioning to RDMA (Converged NIC).
The following image shows the current state of the Hyper-V hosts.
Verify the RDMA configuration.
Results:
Name InterfaceDescription Enabled M1 Mellanox ConnectX-3 Pro Ethernet Adapter True
Determine the ifIndex value of your target adapter.
You use this value in subsequent steps when you run the script you download.
Results:
InterfaceAlias InterfaceIndex IPv4Address M2 14 {192.168.1.5}
Download the DiskSpd.exe utility and extract it into C:TEST.
Download the Test-RDMA powershell script to a test folder on your local drive, for example, C:TEST.
Run the Test-Rdma.ps1 PowerShell script to pass the ifIndex value to the script, along with the IP address of the remote adapter on the same VLAN.
In this example, the script passes the ifIndex value of 14 on the remote network adapter IP address 192.168.1.5.
Note
If the RDMA traffic fails, for the RoCE case specifically, consult your ToR Switch configuration for proper PFC/ETS settings that should match the Host settings. Refer to the QoS section in this document for reference values.
Step 7. Remove the Access VLAN setting
In preparation for creating the Hyper-V switch, you must remove the VLAN settings you installed above.
Remove the ACCESS VLAN setting from the physical NIC to prevent the NIC from auto-tagging the egress traffic with the incorrect VLAN ID.
Removing this setting also prevents it from filtering ingress traffic that doesn't match the ACCESS VLAN ID.
Confirm that the VlanID setting shows the VLAN ID value as zero.
Step 8. Create a Hyper-V vSwitch on your Hyper-V hosts
The following image depicts Hyper-V Host 1 with a vSwitch.
Create an external Hyper-V vSwitch in Hyper-V on Hyper-V Host A.
In this example, the switch is named VMSTEST. Also, the parameter AllowManagementOS creates a host vNIC that inherits the MAC and IP addresses of the physical NIC.
Results:
Name SwitchType NetAdapterInterfaceDescription VMSTEST External Mellanox ConnectX-3 Pro Ethernet Adapter
View the network adapter properties.
Results:
Name InterfaceDescription ifIndex Status MacAddress LinkSpeed vEthernet (VMSTEST) Hyper-V Virtual Ethernet Adapter #2 27 Up E4-1D-2D-07-40-71 40 Gbps
Manage the host vNIC in one of two ways.
- NetAdapter view operates based upon the 'vEthernet (VMSTEST)' name. Not all network adapter properties display in this view.
- VMNetworkAdapter view drops the 'vEthernet' prefix and simply uses the vmswitch name. (Recommended)
Results:
Name IsManagementOs VMName SwitchName MacAddress Status IPAddresses CORP-External-Switch True CORP-External-Switch 001B785768AA {Ok} VMSTEST True VMSTEST E41D2D074071 {Ok}
Test the connection.
Results:
Get link vip. Assign and view the network adapter VLAN settings.
Results:
VMName VMNetworkAdapterName Mode VlanList VMSTEST Access 101
Test the connection.
It may take a few seconds to complete before you can successfully ping the other adapter.
Results:
Step 9. Test Hyper-V Virtual Switch RDMA (Mode 2)
The following image depicts the current state of your Hyper-V hosts, including the vSwitch on Hyper-V Host 1.
Set the priority tagging on the host vNIC.
Results:
Name: VMSTESTIeeePriorityTag : On
View the network adapter RDMA information.
Results:
Name InterfaceDescription Enabled vEthernet (VMSTEST) Hyper-V Virtual Ethernet Adapter #2 False
Note
If the parameter Enabled has the value False, it means that RDMA is not enabled.
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View the network adapter information.
Results:
Name InterfaceDescription ifIndex Status MacAddress LinkSpeed vEthernet (VMSTEST) Hyper-V Virtual Ethernet Adapter #2 27 Up E4-1D-2D-07-40-71 40 Gbps
Enable RDMA on the host vNIC.
Results:
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Name InterfaceDescription Enabled vEthernet (VMSTEST) Hyper-V Virtual Ethernet Adapter #2 True
Note
If the parameter Enabled has the value True, it means that RDMA is enabled.
Perform RDMA traffic test.
The final line in this output, 'RDMA traffic test SUCCESSFUL: RDMA traffic was sent to 192.168.1.5,' shows that you have successfully configured Converged NIC on your adapter.