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V-220670

CAT II (Medium)

The Cisco switch must not use the default VLAN for management traffic.

Rule ID

SV-220670r991907_rule

STIG

Cisco IOS XE Switch L2S Security Technical Implementation Guide

Version

V3R2

CCIs

CCI-004931

Discussion

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.

Check Content

Review the switch configuration and verify that the default VLAN is not used to access the switch for management.

interface Vlan22
 description Management VLAN
 ip address 10.1.22.3 255.255.255.0

If the default VLAN is being used for management access to the switch, this is a finding.

Fix Text

Configure the switch for management access to use a VLAN other than the default VLAN.

SW1(config)#int vlan 22
SW1(config-if)#ip add 10.1.22.3 255.255.255.0
SW1(config-if)#no shut