UCF STIG Viewer Logo

A dedicated management VLAN or VLANs must be configured to keep management traffic separate from user data and control plane traffic.


Overview

Finding ID Version Rule ID IA Controls Severity
V-5628 NET-VLAN-006 SV-5628r2_rule Medium
Description
All ports, including the internal sc0 interface, are configured by default to be members of VLAN 1. In a VLAN-based network, switches use VLAN 1 as the default VLAN for in-band management and to communicate with other networking devices using Spanning-Tree Protocol (STP), Cisco Discovery Protocol (CDP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP) all untagged traffic. As a consequence, VLAN 1 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
Perimeter L3 Switch Security Technical Implementation Guide - Cisco 2018-11-28

Details

Check Text ( C-3767r3_chk )
Review the device configurations to determine if a dedicated VLAN(s) have been implemented for the management network. VLAN 1 must not be used.

If a dedicated VLAN or VLANs have not been established for the management network, this is a finding.

If VLAN 1 is used for management, this is also a finding.
Fix Text (F-5539r2_fix)
Best practices for VLAN-based networks is create a dedicated management VLAN, prune unnecessary ports from gaining access to VLAN 1 as well as the management VLAN, and to separate in-band management, device protocol, and data traffic.