Detections
Analytics
CISC-L2-000220 - The Cisco switch must not have the default VLAN assigned to any host-facing switch ports.
Warning! Audit Deprecated
This audit has been deprecated and will be removed in a future update.
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In a VLAN-based network, switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with other networking devices 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.
Solution
Remove the assignment of the default VLAN from all access switch ports.See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_IOS_Switch_Y26M04_STIG.zip
Item Details
Audit Name: DISA Cisco IOS Switch L2S STIG v3r1
References: CAT|II, CCI|CCI-004891, Rule-ID|SV-220642r991849_rule, STIG-ID|CISC-L2-000220, STIG-Legacy|SV-110255, STIG-Legacy|V-101151, Vuln-ID|V-220642
Plugin: Cisco
Control ID: 823d2253dfae54de0d986574a1840b741bacf10673f91fed8ac64fdf5894824d