STIGQter 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 not have the default VLAN assigned to any host-facing switch ports.

DISA Rule

SV-110357r1_rule

Vulnerability Number

V-101253

Group Title

SRG-NET-000512-L2S-000008

Rule Version

CISC-L2-000220

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Remove the assignment of the default VLAN from all access switch ports.

Check Contents

Review the switch configurations and verify that no access switch ports have been assigned membership to the default VLAN (i.e., VLAN 1). VLAN assignments can be verified via the show vlan command. In the example below, interfaces 1/1 and 1/2 are trunk links.

SW1# show vlan

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Eth1/1, Eth1/2
10 VLAN0010 active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/9, Eth1/10, Eth1/11
Eth1/12, Eth1/13, Eth1/14
Eth1/15, Eth1/16, Eth1/17
Eth1/18, Eth1/19, Eth1/20
Eth1/21, Eth1/22, Eth1/23
Eth1/24, Eth1/25, Eth1/26
Eth1/27, Eth1/28, Eth1/29
Eth1/30
11 VLAN0011 active Eth1/1, Eth1/2, Eth1/31
Eth1/32, Eth1/33, Eth1/34
Eth1/35, Eth1/36, Eth1/37
Eth1/38, Eth1/39, Eth1/40

If there are access switch ports assigned to the default VLAN, this is a finding.

Vulnerability Number

V-101253

Documentable

False

Rule Version

CISC-L2-000220

Severity Override Guidance

Review the switch configurations and verify that no access switch ports have been assigned membership to the default VLAN (i.e., VLAN 1). VLAN assignments can be verified via the show vlan command. In the example below, interfaces 1/1 and 1/2 are trunk links.

SW1# show vlan

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Eth1/1, Eth1/2
10 VLAN0010 active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/9, Eth1/10, Eth1/11
Eth1/12, Eth1/13, Eth1/14
Eth1/15, Eth1/16, Eth1/17
Eth1/18, Eth1/19, Eth1/20
Eth1/21, Eth1/22, Eth1/23
Eth1/24, Eth1/25, Eth1/26
Eth1/27, Eth1/28, Eth1/29
Eth1/30
11 VLAN0011 active Eth1/1, Eth1/2, Eth1/31
Eth1/32, Eth1/33, Eth1/34
Eth1/35, Eth1/36, Eth1/37
Eth1/38, Eth1/39, Eth1/40

If there are access switch ports assigned to the default VLAN, this is a finding.

Check Content Reference

M

Target Key

3551

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