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ngo_s
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Sounds like you need to look at the physical network infrastructure. For example, do you have portfast (or the similar function to spanning tree) enable on the physical switches that are connected to your ESXi infrastructure?

https://kb.vmware.com/s/article/1003804

I would troubleshoot looking at the ARP tables on your physical switches to see if it knows where the VM is located (ESXi host wise) before and after a vMotion.

Other issues could be a mismatch in the port group configuration on the target hosts if you are using standard vswitches. It is also possible to have a mismatch physical port configuration as well. If you are using a distributed virtual switch, ensure you have the proper vlan configs on the physical ports connected to each ESXi physical vmnic.

Other steps would be to ensure that all your ESXi hosts and peripheral devices are on the same firmware/drivers versions or upgrade them to the latest supported from the VMware HCL - https://www.vmware.com/resources/compatibility/search.php. I'm surprised VMware support has not told you to do this yet.

 

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