STIGQter: STIG Summary: Cisco IOS 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-220456r622190_rule

Vulnerability Number

V-220456

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 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-220456

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

4065

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