Script to get VLANs IDs observed by ESXi

[wfrancoti]

Hello Everyone,

Anyone could help me with a PowerCli script to get VLANs IDs observed by ESXi server? I want o run this script in a specific cluster and export it to excel csv file.

Thanks.

[LucD]

Do you mean like this?

$clusterName = 'cluster'

Get-Cluster -Name $clusterName -PipelineVariable cluster |

Get-VMHost -PipelineVariable esx |

Get-VirtualPortGroup |

select @{N='Cluster';E={$cluster.Name}},@{N='VMHost';E={$esx.Name}},VirtualSwitch,Name,VlanId |

Export-Csv -Path .\report.csv -NoTypeInformation -UseCulture

[wfrancoti]

Hi LucD, thanks for the quick reply.

I want to get VLANs IDs observed by ESXi, it is the CDP information, VLANs trucked.

Thanks.

[LucD]

Like this?

$clusterName = 'cluster'

Get-Cluster -Name $clusterName -PipelineVariable cluster |

Get-VMHost -PipelineVariable esx |

ForEach-Object -Process {

   $netSys = Get-View -Id $esx.ExtensionData.ConfigManager.NetworkSystem

   Get-VMHostNetworkAdapter -VMHost $esx -Physical -Name vmnic* |

   Select @{N='Cluster';E={$cluster.Name}},

    @{N='VMHost';E={$esx.Name}},

    @{N='Nic';E={$_.Name}},

    @{N='VlanIds';E={($netSys.QueryNetworkHint($_.Name)).Subnet.VlanId -join '|'}}

} | Export-Csv -Path .\report.csv -NoTypeInformation -UseCulture

[vinivolti]

Hi LucD, this is very good :) How can I get the portgroup name by vmnic in the same statement?

[David Griswold]

LLDP/CDP information via the vnic is not reliable. LLDP/CDP only shows what is observed with a passive sampling of traffic. So, the ESXi hosts will only report what it MIGHT see, not what is actually trunked. If the ESXi hosts is in a busy cluster and all trunked VLANs are active, it should have more complete VLAN list from LLDP/CDP, but it should not be trusted as authoritative.

Here is a good thread on it.
https://community.broadcom.com/vmware-cloud-foundation/discussion/vlan-not-showing-in-esxi-cdp-output