STIGQter: STIG Summary: Nokia Service Router OS 25.x Layer 2 Switch Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 28 Apr 2026:

The Nokia layer 2 switch must implement Rapid Spanning Tree Protocol (RSTP) where virtual local area networks (VLANs) span multiple switches with redundant links.

DISA Rule

SV-283688r1204092_rule

Vulnerability Number

V-283688

Group Title

SRG-NET-000512-L2S-000003

Rule Version

NOKI-L2-000160

Severity

CAT II

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Configure RSTP to be implemented at the access and distribution layers where VLANs span multiple switches.

For VPLS services where RSTP should be implemented, use the command below to enable RSTP for an already-created VPLS service:

- configure service vpls <vpls id>
- stp mode rstp
- no shutdown

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In cases where VLANs do not span multiple switches, it is a best practice to not implement STP. Avoiding the use of STP will provide the most deterministic and highly available network topology. If STP is required, review the router virtual private local area network service (VPLS) configuration to verify RSTP has been implemented.

Use the command below and verify STP mode is set to RSTP for VPLS, where RSTP should be implemented.

- show service id 10 stp | match Mode
Mode : Rstp Last Top. Change : 0d 00:00:00

If RSTP has not been implemented where STP is required, this is a finding.

The Nokia layer 2 switch must implement Rapid Spanning Tree Protocol (RSTP) where virtual local area networks (VLANs) span multiple switches with redundant links.

DISA Rule

Vulnerability Number

Group Title

Rule Version

Severity

CCI(s)

Weight

Fix Recommendation

Check Contents

Vulnerability Number

Documentable

Rule Version

Severity Override Guidance

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Target Key