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Assessment Title
Rule Text
The ESX Server external physical switch ports are configured to VLAN 1.
Description
Discussion Text
Physical switches use the native VLAN for switch control and management protocol. Native VLAN frames are not tagged with any VLAN ID in many types of switches. The trunk ports implicitly treat all untagged frames as native VLAN frames. VLAN 1 is the default native VLAN ID for many commercial switches. However, in many enterprise networks, the native VLAN might be VLAN 1 or any number depending on the switch type. ESX Server does not support virtual switch port groups configured to VLAN 1. If the physical switch port that the ESX Server is connected to is configured with VLAN 1, the ESX Server will drop all packets. The ESX Server virtual switch port groups will be configured with any value between 2 and 4094. Utilizing VLAN 1 will cause a denial of service since the ESX Server drops this traffic.
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