This article describes the troubleshooting of management network connectivity after failover when using Broadcom NetXtreme-E network card
Symptoms:
After network failover (vmnic down or up), esxi management network becomes unreachable and may be disconnected from vCenter server
Troubleshooting:
On physical switches, you can see vmk0 Mac Address (= vmnic0 mac address) on 2 locations
You can also see other NetXtreme-E network cards mac addresses (not only vmnic0) on physical switch.