Configuring SNMP Traps for ESX 3.5 and ESX 4.0

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Details

To generate virtual machine and environmental traps from ESX 3.5 and ESX 4.0 hosts, you must configure and enable the embedded SNMP agent. You cannot use the Net-SNMP-based agent to generate these traps, although it can receive GET transactions and generate other types of traps.
 
This represents a change in behavior from ESX 3.0.x, in which the configuration file for the Net-SNMP-based agent controlled the generation of virtual machine traps. For more information, see Configuring SNMP on an ESX 3.0.x host (1008186).

Solution

Use the vicfg-snmp command from the Remote CLI or vSphere CLI to enable this SNMP agent and configure trap destinations. Each time you specify a target with the vicfg-snmp command, the settings you specify overwrite all previously specified settings. To specify multiple targets, specify them in a single command, separated by commas.

To enable and configure SNMP traps:
 
Note: For ESX 3.5, use the Remote CLI. For ESX 4.0, use the vSphere CLI. The commands for both are same.  vicfg-snmp.pl is located in the C:\Program Files\VMware\VMware vSphere CLI\bin directory after the VMware vSphere CLI installation, by default.
 

  1. Specify the communities and trap targets with the command:

    vicfg-snmp.pl –server <hostname> –username <username> –password <password> -t <target hostname>@<port>/<community>

    Note: Under ESX 4.0, you may need to use the -c <community> flag.

    For example, to send SNMP traps from the host host.example.com to port 162 on target.example.com using the public community, use the command:

    vicfg-snmp.pl –server host.example.com –username root –password password -t target.example.com@162/public
     

  2. To enable the SNMP service, run the command:

    vicfg-snmp.pl –server <hostname> –username <username> –password <password> –enable
     

  3. (Optional) Send a test trap to verify that the agent is configured correctly with the command:

    vicfg-snmp.pl –server <hostname> –username <username> –password <password> –test

The test trap generated is a warmStart trap.

source: http://kb.vmware.com/kb/1008065

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