Changes are coming to https://stigviewer.com.
Take our survey to help us understand your usage and how we can better serve you in the future.
Take Survey
The Cisco switch must have all disabled switch ports assigned to an unused VLAN.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-220667 | CISC-L2-000210 | SV-220667r539671_rule | Medium |
| Description |
|---|
| 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. |
| STIG | Date |
|---|---|
| Cisco IOS XE Switch L2S Security Technical Implementation Guide | 2022-09-12 |
Details
| Check Text ( C-22382r507549_chk ) |
|---|
| Step 1: Review the switch configurations and examine all access switch ports. Each access switch port not in use should have membership to an inactive VLAN. interface GigabitEthernet0/0 switchport access vlan 999 shutdown ! interface GigabitEthernet0/1 switchport access vlan 999 shutdown … … … interface GigabitEthernet0/9 switchport access vlan 999 shutdown Step 2: Verify that traffic from the inactive VLAN is not allowed on any trunk links as shown in the example below: interface GigabitEthernet1/1 switchport trunk allowed vlan 1-998,1000-4094 switchport trunk encapsulation dot1q switchport mode trunk Note: Switch ports configured for 802.1x are exempt from this requirement. If there are any access switch ports not in use and not in an inactive VLAN, this is a finding. |
| Fix Text (F-22371r507550_fix) |
|---|
| 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 |