The VMware ESX server has been certified as a host. The interface monitoring of an ESX server is done using VMware SNMP agent.
The ESX server certification allows:
Connection establishment between an ESX host, which could be a standard virtual switch (vSS) or a virtual distributed switch (vDS) and a physical switch. This is done using Cisco Discovery Protocol.
Impact propagation of the physical switch failure on VMs and ESX.