STIGQter: STIG Summary: Cisco IOS Switch L2S Security Technical Implementation Guide Version: 3 Release: 2 Benchmark Date: 01 Jul 2026:

The Cisco switch must have Root Guard enabled on all switch ports connecting to access layer switches.

DISA Rule

SV-220629r856223_rule

Vulnerability Number

V-220629

Group Title

SRG-NET-000362-L2S-000021

Rule Version

CISC-L2-000090

Severity

CAT III

CCI(s)

• CCI-002385 - Protect against or limit the effects of organization-defined types of denial of service events.

Weight

10

Fix Recommendation

Configure the switch to have Root Guard enabled on all ports connecting to access layer switches.

SW1(config)#int range g0/0 - 9
SW1(config-if-range)#spanning-tree guard root

Check Contents

Review the switch topology as well as the configuration to verify that Root Guard is enabled on all switch ports connecting to access layer switches.

interface GigabitEthernet0/0
spanning-tree guard root
!
interface GigabitEthernet0/1
spanning-tree guard root
…
…
…
interface GigabitEthernet0/9
spanning-tree guard root

If the switch has not enabled Root Guard on all switch ports connecting to access layer switches, this is a finding.

Vulnerability Number

V-220629

Documentable

False

Rule Version

CISC-L2-000090

Severity Override Guidance

Review the switch topology as well as the configuration to verify that Root Guard is enabled on all switch ports connecting to access layer switches.

interface GigabitEthernet0/0
spanning-tree guard root
!
interface GigabitEthernet0/1
spanning-tree guard root
…
…
…
interface GigabitEthernet0/9
spanning-tree guard root

If the switch has not enabled Root Guard on all switch ports connecting to access layer switches, this is a finding.

Check Content Reference

M

Target Key

4070