Vcenter takes care of not allocating duplicate MACs, but it might be worthwhile
to check it, if you are merging two Vcenters or adding hosts from standalone to a vcenter. This could happen if you have UCS ( allocation could happen from a MAC pool
or ESXi holding previous service profile's mac in /etc/vmware/esxi.conf)
From Switch (N5K), show mac-address-table and two veths should not be having same MAC address even if they are different vlan.
From ESX perspective.
vim-cmd hostsvc/datastore/listsummary|egrep "url|name"
for vmid in `vim-cmd vmsvc/getallvms|awk '{print $1}'|grep -v Vmid`;do echo $vmid ;vim-cmd vmsvc/device.getdevices $vmid|grep macAddress;done | |sort| uniq -c|sort| grep -v "^ 1"
Also you can look at UUID
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