The following are the pre-requisites for an ESX server discovery and monitoring:
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VMware SNMP agent should be enabled on the ESX server.
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Cisco Discovery Protocol (CDP) should be enabled on both the ESX server and the physical switch.
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DNS server should have an entry mapping the ESX server name to its IP address.
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Do not enable the Net-SNMP Agent. Enable only the VMware SNMP Agent. If the proxy VMware SNMP Agent / Net SNMP Agent is enabled, the ESX server will be classified as a Linux Host and is treated like any other Linux host.