STIGQter: STIG Summary: Arista MLS EOS 4.X Router Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 02 Apr 2025:

The Arista router must be configured with Unicast Reverse Path Forwarding (uRPF) loose mode enabled on all CE-facing interfaces.

DISA Rule

SV-256022r882408_rule

Vulnerability Number

V-256022

Group Title

SRG-NET-000205-RTR-000008

Rule Version

ARST-RT-000410

Severity

CAT II

CCI(s)

• CCI-001097 - Monitor and control communications at the external managed interfaces to the system and at key managed interfaces within the system.

Weight

10

Fix Recommendation

Enable uRPF loose mode on all CE-facing interfaces.

Configure uRPF loose mode on all CE-facing interfaces.

router(config)#interface Ethernet 3/17/1
router(config-if-Et3/17/1)#ip verify unicast source reachable-via any
router(config-if-Et3/17/1)#end

Check Contents

Review the Arista router configuration to determine if uRPF loose mode is enabled on all CE-facing interfaces.

To verify the interface configuration uRPF loose mode is enabled on all CE-facing interfaces, execute the command "sh run int Eth YY".

interface Ethernet 3/17/1
ip address 10.10.22.1/30
ip verify unicast source reachable-via any

If uRPF loose mode is not enabled on all CE-facing interfaces, this is a finding.

Vulnerability Number

V-256022

Documentable

False

Rule Version

ARST-RT-000410

Severity Override Guidance

Review the Arista router configuration to determine if uRPF loose mode is enabled on all CE-facing interfaces.

To verify the interface configuration uRPF loose mode is enabled on all CE-facing interfaces, execute the command "sh run int Eth YY".

interface Ethernet 3/17/1
ip address 10.10.22.1/30
ip verify unicast source reachable-via any

If uRPF loose mode is not enabled on all CE-facing interfaces, this is a finding.

Check Content Reference

M

Target Key

5513