The layer 2 switch must have all disabled switch ports assigned to an unused VLAN.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-206666	SRG-NET-000512-L2S-000007	SV-206666r385561_rule		Medium

Description
It is possible that a disabled port that is assigned to a user or management VLAN becomes enabled by accident or by an attacker and as a result gains access to that VLAN as a member.

STIG	Date
Layer 2 Switch Security Requirements Guide	2021-05-17

Details

Check Text ( C-6924r298428_chk )
Review the switch configurations and examine all access switch ports. Each access switch port not in use should have membership to an inactive VLAN that is not used for any purpose and is not allowed on any trunk links. If there are any access switch ports not in use and not in an inactive VLAN, this is a finding. Note: Switch ports configured for 802.1x are exempt from this requirement.

Fix Text (F-6924r298429_fix)
Assign all switch ports not in use to an inactive VLAN. Note: Switch ports configured for 802.1x are exempt from this requirement.