The Cisco switch must not use the default VLAN for management traffic.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-220693 | CISC-L2-000240 | SV-220693r991949_rule | CCI-004931 | medium |
| Description | ||||
| Switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with directly connected switches 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 NX OS Switch L2S Security Technical Implementation Guide | 2024-08-22 | |||
Details
Check Text (C-220693r991949_chk)
Review the switch configuration and verify that the default VLAN is not used to access the switch for management.
interface Vlan1
interface Vlan44
description Management VLAN
ip address 10.1.12.1/24
If the default VLAN is being used for management access to the switch, this is a finding.
Fix Text (F-22397r539131_fix)
Configure the switch for management access to use a VLAN other than the default VLAN.
SW1(config)# interface vlan 44
SW1(config-if)# ip add 10.1.12.1/24
SW1(config-if)# end