The Cisco switch must not use the default VLAN for management traffic.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-220693 | SRG-NET-000512-L2S-000010 | CISC-L2-000240 | SV-220693r991949_rule | 2024-08-22 | 3 |
| 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. |
| ℹ️ Check |
|---|
| 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 |
|---|
| 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 |