STIGQter: STIG Summary: RUCKUS ICX Router Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 27 May 2025:

The RUCKUS ICX BGP router must be configured to limit the prefix size on any inbound route advertisement to /24 or the least significant prefixes issued to the customer.

DISA Rule

SV-273635r1110897_rule

Vulnerability Number

V-273635

Group Title

SRG-NET-000362-RTR-000118

Rule Version

RCKS-RTR-000680

Severity

CAT III

CCI(s)

• CCI-002385 - Protect against or limit the effects of organization-defined types of denial of service events.

Weight

10

Fix Recommendation

This requirement is not applicable for the DODIN Backbone.

Configure the router to limit the prefix size on any route advertisement to /24 or the least significant prefixes issued to the customer.

1. Configure a prefix list to reject any prefix that is longer than /24.
ICX(config)#ip prefix-list FILTER_PREFIX_LENGTH permit 0.0.0.0/0 ge 8 le 24
ICX(config)#ip prefix-list FILTER_PREFIX_LENGTH deny 0.0.0.0/0 le 32

2. Apply the prefix list to all eBGP peers as shown in the example below:
ICX(config)#router bgp
ICX(config-bgp-router)#neighbor x.1.1.9 prefix-list FILTER_PREFIX_LENGTH in

Check Contents

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to determine if it is compliant with this requirement.

1. Verify a route filter has been configured to reject prefixes longer than /24, or the least significant prefixes issued to the customers as shown in the example below:
ip prefix-list FILTER_PREFIX_LENGTH seq 5 permit 0.0.0.0/0 ge 8 le 24
ip prefix-list FILTER_PREFIX_LENGTH seq 10 deny 0.0.0.0/0 le 32

2. Verify prefix filtering has been applied to each eBGP peer as shown in the following example:
router bgp
neighbor x.1.1.9 remote-as yy
neighbor x.1.1.9 prefix-list FILTER_PREFIX_LENGTH in

If the router is not configured to limit the prefix size on any inbound route advertisement to /24, or the least significant prefixes issued to the customer, this is a finding.

Vulnerability Number

V-273635

Documentable

False

Rule Version

RCKS-RTR-000680

Severity Override Guidance

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to determine if it is compliant with this requirement.

1. Verify a route filter has been configured to reject prefixes longer than /24, or the least significant prefixes issued to the customers as shown in the example below:
ip prefix-list FILTER_PREFIX_LENGTH seq 5 permit 0.0.0.0/0 ge 8 le 24
ip prefix-list FILTER_PREFIX_LENGTH seq 10 deny 0.0.0.0/0 le 32

2. Verify prefix filtering has been applied to each eBGP peer as shown in the following example:
router bgp
neighbor x.1.1.9 remote-as yy
neighbor x.1.1.9 prefix-list FILTER_PREFIX_LENGTH in

If the router is not configured to limit the prefix size on any inbound route advertisement to /24, or the least significant prefixes issued to the customer, this is a finding.

Check Content Reference

M

Target Key

5696