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I have a Failover Cluster of 2 HyperV Windows Server 2012 R2 DataCenter. Both servers have OVS installed and configured in exactly the same way:

PS C:\Users\Administrator.VBN> Get-NetAdapter
Name                      InterfaceDescription                    ifIndex Status       MacAddress             LinkSpeed
----                      --------------------                    ------- ------       ----------             ---------
br0                       Hyper-V Virtual Ethernet Adapter #3          32 Up           00-15-5D-A3-51-0B        10 Gbps
vEthernet (OOB - Virtu... Hyper-V Virtual Ethernet Adapter #2          23 Up           6C-3B-E5-B3-EE-96        10 Gbps
NIC-4 Mgmt OOB            HP NC382i DP Multifunction Gigabi...#54      12 Up           6C-3B-E5-B3-EE-96         1 Gbps
NIC-3 LudoLab             HP NC382i DP Multifunction Gigabi...#53      15 Up           6C-3B-E5-B3-EE-94         1 Gbps
NIC-5 iSCSI               HP NC382T PCIe DP Multifunction G...#64      24 Up           10-60-4B-B2-0F-8C         1 Gbps
NIC-2 POC Team            HP NC382i DP Multifunction Gigabi...#52      14 Up           6C-3B-E5-B3-EE-9A         1 Gbps
NIC-1 POC Team            HP NC382i DP Multifunction Gigabi...#51      13 Up           6C-3B-E5-B3-EE-98         1 Gbps
POC Teaming               Microsoft Network Adapter Multiplexo...      19 Up           6C-3B-E5-B3-EE-98         2 Gbps
NIC-6 Clustering          HP NC382T PCIe DP Multifunction G...#65      25 Up           10-60-4B-B2-0F-8E         1 Gbps


PS C:\Users\Administrator.VBN> Get-VMSwitch -Name LudoLab
Name    SwitchType NetAdapterInterfaceDescription                       
----    ---------- ------------------------------                       
LudoLab External   HP NC382i DP Multifunction Gigabit Server Adapter #53


PS C:\Users\Administrator.VBN> Get-VMSwitchExtension -VMSwitchName LudoLab -Name "Open vSwitch Extension"
Id                  : 583CC151-73EC-4A6A-8B47-578297AD7623
Name                : Open vSwitch Extension
Vendor              : Cloudbase Solutions Srl
Version             : 2.5.0.1
ExtensionType       : Forwarding
ParentExtensionId   : 
ParentExtensionName : 
SwitchId            : 853568bc-80b4-46a2-9bad-967e904cf076
SwitchName          : LudoLab
Enabled             : True
Running             : True
ComputerName        : HYPERV1
Key                 : 
IsDeleted           : False


PS C:\Users\Administrator.VBN> ovs-vsctl show
f43a3bbb-c96a-4c83-a5f9-47d7310ec6d2
    Bridge "br0"
        Port "br0"
            Interface "br0"
                type: internal
        Port "NIC-3 LudoLab"
            trunks: [101, 102]
            Interface "NIC-3 LudoLab"

I now have a VM1 on the Failover Cluster, located on HyperV1. I want to attach it to the OVS bridge on vlan 101, so on HyperV1 I do this:

$vnic = Get-VMNetworkAdapter VM1
$vnic[0] | Set-VMNetworkAdapterOVSPort -OVSPortName VM1-Eth1
Connect-VMNetworkAdapter -VMNetworkAdapter $vnic[0] -SwitchName LudoLab
ovs-vsctl add-port br0 VM1-Eth1 tag=101

This works fine and my VM1 now has connectivity over the OVS bridge on VLAN101; my OVS bridge on HyperV1 now looks like this:

PS C:\Users\Administrator.VBN> ovs-vsctl show
f43a3bbb-c96a-4c83-a5f9-47d7310ec6d2
    Bridge "br0"
        Port "br0"
            Interface "br0"
                type: internal
        Port "VM1-Eth1"
            tag: 101
            Interface "VM1-Eth1"
        Port "NIC-3 LudoLab"
            trunks: [101, 102]
            Interface "NIC-3 LudoLab"

However, I need my HyperV2 server to have exactly the same OVS configuration, for when I live-migrate VM1 to it.

So I try and configure this on HyperV2, but get an error:

PS C:\Users\Administrator.VBN> ovs-vsctl add-port br0 VM1-Eth1 tag=101
ovs-vsctl : ovs-vsctl: Error detected while setting up 'VM1-Eth1'.  See ovs-vswitchd log for details.
At line:1 char:1
+ ovs-vsctl add-port br0 VM1-Eth1 tag=101
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (ovs-vsctl: Erro...og for details.:String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError

The entry in ovs-vswitchd.log is:

2016-09-05T14:16:21.988Z|00103|dpif|WARN|system@ovs-system: failed to add VM2-Eth1 as port: Invalid argument

In spite of the error message, "ovs-vsctl show" on HyperV2 now shows the same identical OVS configuration as for HyperV1. However, if I now live-migrate my VM1 to HyperV2 the VM loses network connectivity.

In order to correct this I need to do these steps on HyperV2:

ovs-vsctl del-port ...