It is critial for accuratly monitoring your ESX hosts. So here is how to enable it.
First you will need to make the neccesary hole in the ESX firewall, do this by running as root
esxcfg-firewall -e snmpd
Then configure snmp. You will need to do this appropriatly for your environment, but edit /etc/snmp/snmpd.conf
Once you have done this, type
chkconfig –level 2345 snmpd on
To enable snmpd on startup init levels 2, 3, 4 and 5.
Then either reboot or type
Jobs a goodun.