STIGQter: STIG Summary: Cisco NX-OS Switch L2S Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 08 May 2020:

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

DISA Rule

SV-110355r1_rule

Vulnerability Number

V-101251

Group Title

SRG-NET-000512-L2S-000007

Rule Version

CISC-L2-000210

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

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

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

SW1(config)# int e1/81-128
SW1(config-if-range)# switchport access vlan 999
SW1(config-if-range)# end

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

SW1(config-if)# switchport trunk allowed vlan except 999
SW1(config-if)# end

Check Contents

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 Ethernet1/81
shutdown
switchport access vlan 999

interface Ethernet1/82
shutdown
switchport access vlan 999

interface Ethernet1/83
shutdown
switchport access vlan 999

Step 2: Verify that traffic from the inactive VLAN is not allowed on any trunk links as shown in the example below:

interface Ethernet1/1
switchport mode trunk
switchport trunk allowed vlan 1-998,1000-4094

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.

Vulnerability Number

V-101251

Documentable

False

Rule Version

CISC-L2-000210

Severity Override Guidance

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 Ethernet1/81
shutdown
switchport access vlan 999

interface Ethernet1/82
shutdown
switchport access vlan 999

interface Ethernet1/83
shutdown
switchport access vlan 999

Step 2: Verify that traffic from the inactive VLAN is not allowed on any trunk links as shown in the example below:

interface Ethernet1/1
switchport mode trunk
switchport trunk allowed vlan 1-998,1000-4094

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.

Check Content Reference

M

Target Key

3551

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