The Cisco switch must not have the default VLAN assigned to any host-facing switch ports.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-220642	CISC-L2-000220	SV-220642r539671_rule		Medium

Description
In a VLAN-based network, switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with other networking devices using Spanning-Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP) - all untagged traffic. As a consequence, the default VLAN may unwisely span the entire network if not appropriately pruned. If its scope is large enough, the risk of compromise can increase significantly.

Description

In a VLAN-based network, switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with other networking devices using Spanning-Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP) - all untagged traffic. As a consequence, the default VLAN may unwisely span the entire network if not appropriately pruned. If its scope is large enough, the risk of compromise can increase significantly.

STIG	Date
Cisco IOS Switch L2S Security Technical Implementation Guide	2023-09-14

Details

Check Text ( C-22357r507972_chk )
Review the switch configurations and verify that no access switch ports have been assigned membership to the default VLAN (i.e., VLAN 1). VLAN assignments can be verified via the show vlan command: SW1#show vlan VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active 10 User VLAN active Gi0/3, Gi1/0, Gi1/1, Gi1/2 Gi1/3, Gi2/1 20 Management VLAN active Gi0/2 999 VLAN0999 active Gi2/0 If access switch ports are assigned to the default VLAN, this is a finding.

Check Text ( C-22357r507972_chk )

Review the switch configurations and verify that no access switch ports have been assigned membership to the default VLAN (i.e., VLAN 1). VLAN assignments can be verified via the show vlan command:

SW1#show vlan

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
10 User VLAN active Gi0/3, Gi1/0, Gi1/1, Gi1/2
Gi1/3, Gi2/1
20 Management VLAN active Gi0/2
999 VLAN0999 active Gi2/0

If access switch ports are assigned to the default VLAN, this is a finding.

Fix Text (F-22346r507973_fix)
Remove the assignment of the default VLAN from all access switch ports.