STIGQter STIGQter: STIG Summary: Cisco IOS-XE Switch RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Apr 2021:

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

DISA Rule

SV-221048r622190_rule

Vulnerability Number

V-221048

Group Title

SRG-NET-000205-RTR-000008

Rule Version

CISC-RT-000740

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

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

SW2(config)#int SW1(config)#int g0/2
SW2(config-if)#ip verify unicast source reachable-via any
SW2(config-if)#end

Check Contents

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

interface GigabitEthernet0/2
no switchport
ip address x.1.12.2 255.255.255.252
ip access-group BLOCK_TO_CORE in
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-221048

Documentable

False

Rule Version

CISC-RT-000740

Severity Override Guidance

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

interface GigabitEthernet0/2
no switchport
ip address x.1.12.2 255.255.255.252
ip access-group BLOCK_TO_CORE in
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

4074

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