If you observe sporadic interface flaps on a VOS VM, hosted on vmware/EXSI, post upgrading to 22.1.4,  please execute the below steps - technical details on the reason for executing this are provided in the note further below.

  1. Go the shell of this VM and edit the file /opt/versa/etc/vsboot.conf   
  2. Please append a line "false_link_flap = true"  just below   " - - virtio  =  false", as highlighted in the screenshot below (it should look as below)


    --  virtio             = false,

        false_link_flap    = true,

     


  3. Save the file and perform a "vsh restart" 

<screenshot>

Details: Basically, the vmxnet3 port polls the hypervisor for the link state and if the hypervisor response is missed/lost (or if it fails to respond), the state transitions to down, and then it transitions to up state again post a single successful poll.  By setting "false_link_flap = true", we can introduce more robustness to this polling, it will poll the hypervisor 2 more times before declaring the link as down. This was enabled by default on the previous releases, and whereas in 22.1.4 it was removed to be set manually when needed.