Detections
Analytics

1.16 CISC-L2-000210

Information

The Cisco switch must have all disabled switch ports assigned to an unused VLAN.

GROUP ID: V-220667
RULE ID: SV-220667r991904

It is possible that a disabled port that is assigned to a user or management VLAN becomes enabled by accident or by an attacker and as a result gains access to that VLAN as a member.

Solution

Assign all switch ports not in use to an inactive VLAN.

Step 1: Assign the disabled interfaces to an inactive VLAN.

SW3(config)#int range g0/0 - 9
SW3(config-if-range)# switchport access vlan 999

Step 2: Configure trunk links to not allow traffic from the inactive VLAN.

SW3(config)#int g1/1
SW3(config-if)#switchport trunk allowed vlan except 999

See Also

https://workbench.cisecurity.org/benchmarks/23612

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7, CAT|II, CCI|CCI-004891, Rule-ID|SV-220667r991904_rule, STIG-ID|CISC-L2-000210, Vuln-ID|V-220667

Plugin: Cisco

Control ID: 213534a16f5741a3f47e07d6661ec8fb25eb00bc08e5f2a0998f05e02fa56110