I have created a PowerCLI script that can be used for applying SNMP configuration on multiple ESXi hosts of a vSphere Cluster by replicating configuration from a reference ESXi host.

Leave a comment with your email address if you have a question and I will get back to you soon.

Enjoy the script 🙂

<#
  configure-snmp-on-esxi.ps1
  
  Configure SNMP settings on multiple ESXi hosts using a reference host settings
 
  .History.
    2020/04/09 - 0.1 - Reza Rafiee	- First version
    
  .Variables.
    $VC: vCenter Server
    $targethosts: Target ESXi host cluster
      (to apply on single ESXi host refer to line30) 
    $refesxhost : Reference ESXi host
 
#>
 
$VC="vCenter Server Name"
$targethosts="Target cluster name"
$refesxhost = "Reference ESXi host name"
 
 
 
Connect-viserver $VCServer
$refhost = get-vmhost $refesxhost
$refesxcli = Get-EsxCli -VMhost $refhost -V2
$snmp=$refesxcli.system.snmp.get.invoke()
write-host "SNMP configuration on " $refesxhost," (Refernce Host): " 
$snmp
 
$vmhosts = get-cluster -name $targethosts | get-vmhost
<#If you want to apply the snmp config on a single host
 then enter ESXi host name for $targethosts variable and
 replace the above line with the below line:
 
 $vmhosts = get-vmhost -name $targethosts
 
 #> 
 
 
foreach ($vmhost in $vmhosts){
 
  $esxcli = Get-EsxCli -VMHost $vmhost -V2
 
<#Reset SNMP settings to factory default on the target host prior to
reconfigure SNMP settings on that host#>
  $snmpreset = $esxcli.system.snmp.set.CreateArgs()
  $snmpreset.reset = $true
  $esxcli.system.snmp.set.Invoke($snmpreset)
 
  write-host "SNMP settigs has been reset to default on $vmhost"
#SNMP settings reset complete
 
  $esxcli = Get-EsxCli -VMHost $vmhost -V2
  $arguments = $esxcli.system.snmp.set.CreateArgs()
 
 #The below arguments (if statements) cannot be null hence we skip the null ones
 
if ($snmp.communities -ne $null) {
	$arguments.communities = $snmp.communities  
}
 
if ($snmp.engineid -ne "$null") {
	write-host "engineid is nt null"
	$arguments.engineid = $snmp.engineid
}
 
if ($snmp.targets -ne $null) {
	$arguments.targets = $snmp.targets
}
 
if ($snmp.users -ne $null) {
	$arguments.users = $snmp.users
}
 
if ($snmp.privacy -in ("none", "AES128")) {
	$arguments.privacy = $snmp.privacy
}
 
if ($snmp.remoteusers -ne $null) {
	$arguments.remoteusers = $snmp.remoteusers
}
 
if ($snmp.authentication -in ("none", "MD5", "SHA1")) {
	$arguments.authentication = $snmp.authentication
}
 
if ($snmp.v3targets -in ("none", "auth", "priv")) {
	$arguments.v3targets = $snmp.v3targets
}
 
  $arguments.hwsrc = $snmp.hwsrc
  $arguments.largestorage = $snmp.largestorage
  $arguments.loglevel = $snmp.loglevel
  $arguments.notraps = $snmp.notraps
  $arguments.enable = $snmp.enable
  $arguments.port = $snmp.port
  $arguments.syscontact = $snmp.syscontact
  $arguments.syslocation = $snmp.syslocation
 
  $esxcli.system.snmp.set.Invoke($arguments)
 
  $newsnmp=$esxcli.system.snmp.get.Invoke()
  write-host "SNMP configuration on", $vmhost, ": "
  $newsnmp
 
}