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Disabled switch ports must be placed in an unused VLAN (do not use VLAN1).


Finding ID Version Rule ID IA Controls Severity
V-3973 NET-VLAN-002 SV-3973r2_rule Low
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.
Layer 2 Switch Security Technical Implementation Guide - Cisco 2019-01-09


Check Text ( C-4035r3_chk )
Review the device configuration to determine if all disabled ports have been placed into an unused VLAN. The VLAN must not be VLAN 1.

If disabled ports are not assigned to an unused VLAN or have been placed into VLAN 1, this is a finding.
Fix Text (F-3906r2_fix)
Assign all disabled ports to an unused VLAN. Do not use VLAN1.