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The Multicast Source Discovery Protocol (MSDP) Cisco ACI must be configured to filter received source-active multicast advertisements for any undesirable multicast groups and sources.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-272065CACI-RT-000005SV-272065r1115723_ruleCCI-001368low
Description
The interoperability of BGP extensions for interdomain multicast routing and MSDP enables seamless connectivity of multicast domains between autonomous systems. MP-BGP advertises the unicast prefixes of the multicast sources used by Protocol Independent Multicast (PIM) routers to perform RPF checks and build multicast distribution trees. MSDP is a mechanism used to connect multiple PIM sparse-mode domains, allowing RPs from different domains to share information about active sources. MSDP helps ACI border leaf switches identify the location of multicast sources in external networks, allowing them to properly route multicast traffic to interested receivers within the ACI fabric. MSDP within a layer 3 context, allowing the ACI fabric to discover multicast sources located in other multicast domains when connecting to external networks through "L3Out" connections, enabling efficient multicast traffic forwarding across different network segments.
STIGDate
Cisco ACI Router Security Technical Implementation Guide2025-06-18

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (17) 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.

AST-04Network Diagrams & Data Flow Diagrams (DFDs)
1.00
AST-04.2Control Applicability Boundary Graphical Representation
1.00
CFG-02Secure Baseline Configurations
1.00
CRY-01Use of Cryptographic Controls
1.00
DCH-01Data Protection
1.00
DCH-19Geographic Location of Data
1.00
END-01Endpoint Device Management (EDM)
1.00
END-04Malicious Code Protection (Anti-Malware)
1.00
END-06Endpoint File Integrity Monitoring (FIM)
1.00
IAC-21Least Privilege
1.00

+7 more (top 10 by confidence shown)

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (42) 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.

AC-2(1)Automated System Account Management
1.00
AC-2(10)Shared and Group Account Credential Change
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3Access Enforcement
1.00
AC-3(7)Role-based Access Control
1.00
AC-4Information Flow Enforcement
1.00
AC-6(10)Prohibit Non-privileged Users from Executing Privileged Functions
1.00
AC-6(9)Log Use of Privileged Functions
1.00

+32 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) 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.

3.1.3
1.00
CCI1 mapping
CCI-001368
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (4) 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-09
1.00
ID.AM-03
1.00
PR.DS-10
1.00
PR.IR-01
1.00

Who does this work

18 NICE work roles and 10 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-272065r1115723_chk)

If this is a DODIN or JRSS system, this is not applicable. Verify the ip route-map command with specific filter criteria under the relevant BGP neighbor configuration is configured to block any unwanted multicast prefixes from being advertised as shown in the example below: router bgp 100 neighbor 10.1.1.2 remote-as 200 address-family ipv4 unicast route-map BLOCK_MULTICAST permit If the ACI is not configured to reject outbound route advertisements that do not belong to any customers or the local AS, this is a finding.

Fix Text (F-76022r1115722_fix)

Use the ip route-map command with specific filter criteria under the relevant BGP neighbor configuration to block any unwanted multicast prefixes from being advertised. 1. Navigate to BGP neighbor configuration. apci1(config)# router bgp <AS number> apci1(config-router)# neighbor <peer-IP> remote-as <peer-AS> 2. Create a route map. apci1(config-router)# ip route-map <route-map-name> permit 10 apci1(config-router)# match ip address prefix <undesirable-multicast-prefix> exit 3. Apply route-map to BGP neighbor. apci1(config)# address-family ipv4 unicast apci1(config)# route-map <route-map-name> permit