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V-101155

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

Finding ID
CISC-L2-000240
Rule ID
SV-110259r1_rule
Severity
Cat II
CCE
(None)
Group Title
SRG-NET-000512-L2S-000010
CCI
CCI-000366
Target Key
(None)
Documentable
No
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.

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

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.