DCasota
Expert
Expert

Hi,

if you add physically two new nics to each esxi host, you need to put the esxi host in maintenance mode. After the new nics have been added, you could configure a standard vswitch. Evacuate the vms from other esxi hosts with vds to esxi host with vss until each esxi host has the new nics. In vCenter you can migrate from standard to distributed vswitch.

Assuming you're using as vlan tagging method external switch vlan tagging as well.
 
See hereIt is best to have access to the ESXi hosts, although you might not need it. If something goes wrong, you can access the console of the ESXi hosts.
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