VCWN-06-000020 - All port groups must not be configured to VLAN values reserved by upstream physical switches.


Certain physical switches reserve certain VLAN IDs for internal purposes and often disallow traffic configured to these values. For example, Cisco Catalyst switches typically reserve VLANs 1001-1024 and 4094, while Nexus switches typically reserve 3968-4047 and 4094. Check with the documentation for your specific switch. Using a reserved VLAN might result in a denial of service on the network.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.


From the vSphere Web Client go to Networking >> Select a distributed port group >> Manage >> Settings >> Policies. Click Edit and under the VLAN section change the VLAN ID to not be a reserved VLAN ID and click OK.


From a PowerCLI command prompt while connected to the vCenter server run the following command:

Get-VDPortgroup 'portgroup name' | Set-VDVlanConfiguration -VlanId 'New VLAN#'

See Also

Item Details


References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Group-ID|V-63977, Rule-ID|SV-78467r1_rule, STIG-ID|VCWN-06-000020, Vuln-ID|V-63977

Plugin: VMware

Control ID: 0aa06997e0eab32466536849ae71ed09e7ef3ff19237d7b66215f9e05042c8f3