Virtual Switch / Virtual Network Adapters Added to Host Question

Kevin S 20 Reputation points
2023-04-30T19:02:11.0866667+00:00

Hello Folks – We're setting up a new 2-node Server 2022 hyper-v cluster with SCVMM 2022. Utilizing SET (Switch Embedded Team) following the article below. For the Logical Network we’re using “VLAN Based Independent”. My question is regarding the “Configure the Hosts” section where we go to “Virtual Switches” on the host, add the Virtual Switch with Virtual Network Adapters. Since we have 3 VLAN’s we’re using for our VM’s I see 3 virtual adapters added to our two hosts.   

These virtual adapters presented on the Server 2022 hosts have IPv4 and IPv6 enabled but no IP assigned. When I look in Failover Cluster Manager I don’t see these 3 virtual adapters added in the network section. When I run the cluster validation wizard it says they won’t be added because they have a APIPA address. Should I care about this, and do I have something misconfigured?  

Article - https://argonsys.com/microsoft-cloud/library/lets-build-a-switch-embedded-team-in-scvmm/ 

Thank you for your feedback! 

System Center Virtual Machine Manager
0 comments
Accepted answer
  1. Konstantinos Passadis 17,276 Reputation points
    2023-05-01T13:31:13.1766667+00:00

    Hello @kevin s

    The virtual adapters added to the Server 2022 hosts with IPv4 and IPv6 enabled but no IP assigned are expected if you're using VLAN-based independent logical networks in SCVMM. These virtual adapters are used to represent the VLANs on the host and will not have an IP address assigned to them since they are virtual network adapters used only for network communication between the virtual machines and the physical switch.

    Regarding the cluster validation wizard error that the virtual adapters won't be added because they have an APIPA address, this is also expected since the virtual adapters are not assigned an IP address. The cluster validation wizard verifies that the physical network adapters on the cluster nodes are configured with a valid IP address and can communicate with each other.

    If you have configured the logical network and virtual switches correctly in SCVMM and the virtual machines are able to communicate with each other and with the outside world, then you should not be concerned about the APIPA error in the cluster validation wizard. The virtual adapters are not used for cluster communication, and as long as the physical network adapters on the cluster nodes are configured correctly, the cluster should function properly.

    However, if you're experiencing issues with communication between the virtual machines or with the outside world, you may want to double-check your logical network and virtual switch configurations in SCVMM to ensure that they are set up correctly.

    Please "Accept the answer" if the information helped you.

    Regards

2 additional answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. risolis 8,701 Reputation points
    2023-04-30T21:55:29.99+00:00
    • Hello @Kevin S
    • Thank you for posting this concern on this community.
    • I would like to know if you have checked if "Teredo tunneling pseudo-interface" is enabled on it and if it is enabled, try to disable it and try it again.
    • Looking forward to hearing from you

    Cheers,

    Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

  2. Konstantinos Passadis 17,276 Reputation points
    2023-05-01T15:00:06.5333333+00:00

    Hello @kevin s !

    If disabling IPv6 on the virtual adapters makes them disappear from Failover Cluster Manager (FCM) but they appear to function properly, it is possible that the virtual adapters are not configured to use IPv6 properly.

    In a failover cluster environment, it is recommended to disable IPv6 on the virtual adapters unless it is required for a specific application or service. This is because IPv6 can cause issues with failover clustering, such as network partitioning.

    If the virtual adapters are functioning properly with IPv6 disabled and are not required for any specific application or service, it should be safe to leave IPv6 disabled. However, if you need to use IPv6 for a specific application or service, you may need to configure the virtual adapters to use IPv6 properly in the failover cluster environment.

    You can also try enabling IPv6 on the virtual adapters and checking the network status in Failover Cluster Manager. If the virtual adapters are properly configured to use IPv6 and there are no issues with network partitioning, they should appear in FCM without being in a partitioned state.

    Kindly mark this answer as Accepted in case it helped or post your feedback !

    Regards

    0 comments