STIGQter: STIG Summary: Cisco IOS XR Router RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Oct 2020:

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

DISA Rule

SV-216802r531087_rule

Vulnerability Number

V-216802

Group Title

SRG-NET-000205-RTR-000008

Rule Version

CISC-RT-000740

Severity

CAT II

CCI(s)

• CCI-001097 - The information system monitors and controls communications at the external boundary of the information system and at key internal boundaries within the system.

Weight

10

Fix Recommendation

Configure uRPF loose mode on all CE-facing interfaces as shown in the example

RP/0/0/CPU0:R3(config)#int g1/1/0/0
RP/0/0/CPU0:R3(config-if)#ipv4 verify unicast source reachable-via any

Check Contents

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

interface GigabitEthernet1/1/0/0
ip address x.1.12.2 255.255.255.252
ipv4 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-216802

Documentable

False

Rule Version

CISC-RT-000740

Severity Override Guidance

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

interface GigabitEthernet1/1/0/0
ip address x.1.12.2 255.255.255.252
ipv4 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

4029

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