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The Dell OS10 BGP router must be configured to reject outbound route advertisements for any prefixes belonging to the IP core.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-269877OS10-RTR-000430SV-269877r1052016_ruleCCI-001097medium
Description
Outbound route advertisements belonging to the core can result in traffic either looping or being black holed, or at a minimum, using a nonoptimized path.
STIGDate
Dell OS10 Switch Router Security Technical Implementation Guide2026-03-04

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (18) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CFG-02Secure Baseline Configurations
1.00
CRY-01Use of Cryptographic Controls
1.00
CRY-01.1Alternate Physical Protection
1.00
CRY-03Transmission Confidentiality
1.00
CRY-04Transmission Integrity
1.00
CRY-05Encrypting Data At Rest
1.00
DCH-01Data Protection
1.00
IAC-21Least Privilege
1.00
MON-01Continuous Monitoring
1.00
MON-01.1Intrusion Detection & Prevention Systems (IDS & IPS)
1.00

+8 more (top 10 by confidence shown)

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (10) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CM-6Configuration Settings
1.00
SC-24Fail in Known State
1.00
SC-47Alternate Communications Paths
1.00
SC-5Denial-of-service Protection
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(29)Separate Subnets to Isolate Functions
1.00
SC-7(5)Deny by Default — Allow by Exception
1.00
SI-4System Monitoring
1.00
SI-4(11)Analyze Communications Traffic Anomalies
1.00
NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (3) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.13.1
1.00
3.13.2
1.00
3.13.5
1.00
CCI1 mapping
CCI-001097
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (5) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

DE.CM-01
1.00
PR.DS-01
1.00
PR.DS-02
1.00
PR.DS-10
1.00
PR.IR-01
1.00

Who does this work

15 NICE work roles and 9 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-269877r1052016_chk)

Review the router configuration to verify that there is a filter defined to block route advertisements for prefixes that belong to the IP core. The prefix filter must be referenced outbound on the appropriate BGP neighbor statements. Step 1: Verify a prefix list has been configured containing the current IP core prefixes as shown in the example below. ip prefix-list CORE_PREFIX_FILTER seq 5 deny 20.0.0.0/24 ge 8 le 32 ip prefix-list CORE_PREFIX_FILTER seq 10 deny 30.0.0.0/24 ge 8 le 32 ip prefix-list CORE_PREFIX_FILTER seq 15 permit 0.0.0.0/0 ge 8 Step 2: Verify the route map applied to the external neighbors references the configured prefix list shown above. ! route-map CORE_PREFIX_FILTER_MAP permit 10 match ip address prefix-list CORE_PREFIX_FILTER ! router bgp 10 ! neighbor 40.1.1.10 ! address-family ipv4 unicast route-map CORE_PREFIX_FILTER_MAP OUT If the router is not configured to reject outbound route advertisements that belong to the IP core, this is a finding.

Fix Text (F-73811r1052015_fix)

Configure all eBGP routers to filter outbound route advertisements belonging to the IP core. Step 1: Add to the prefix filter list those prefixes belonging to the IP core. OS10(config)# ip prefix-list CORE_PREFIX_FILTER seq 5 deny 20.0.0.0/24 ge 8 le 32 OS10(config)# ip prefix-list CORE_PREFIX_FILTER seq 10 deny 30.0.0.0/24 ge 8 le 32 OS10(config)# ip prefix-list CORE_PREFIX_FILTER seq 15 permit 0.0.0.0/0 ge 8 Step 2: Configure the route map referencing the configured prefix list. OS10(config)# route-map CORE_PREFIX_FILTER_MAP 10 OS10(config-route-map)# match ip address prefix-list CORE_PREFIX_FILTER OS10(config-route-map)# exit Step 3: Apply the route-map inbound to each external BGP neighbor. OS10(config)# router bgp 10 OS10(config-router-bgp-10)# neighbor 40.1.1.10 OS10(config-router-neighbor)# address-family ipv4 unicast OS10(config-router-bgp-neighbor-af)# route-map CORE_PREFIX_FILTER_MAP out OS10(config-router-bgp-neighbor-af)# exit OS10(config-router-neighbor)# exit OS10(config-router-bgp-10)# template ebgp OS10(config-router-template)# address-family ipv4 unicast OS10(config-router-bgp-template-af)# route-map CORE_PREFIX_FILTER_MAP out OS10(config-router-bgp-template-af)# exit OS10(config-router-template)# exit OS10(config-router-bgp-10)# exit