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The Cisco ACI multicast shortest-path tree (SPT) threshold must be set to the default.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-272093CACI-RT-000033SV-272093r1113999_ruleCCI-002385medium
Description
On a Cisco ACI, the "ip pim spt-threshold" is not set to infinity by default; it is typically set to a finite value, with the default usually being zero, meaning it will always use the SPT for PIM calculations. The standard configuration for "ip pim spt-threshold" on Cisco devices is usually set to zero. This threshold determines when a router will use the SPT to forward multicast traffic in PIM Sparse Mode. While technically possible, setting the threshold to "infinity" would mean the router would never use the SPT, which is generally not the intended behavior. In a Cisco ACI fabric, the SPT threshold typically does not need to be manually configured to increase it for multicast, as the system automatically calculates the SPT based on the network topology, and the border leaf switches handle the SPT switchover functionality; however, in specific scenarios where there are a large number of multicast sources, or multicast traffic flow must be optimized, adjusting the SPT threshold may be considered depending on the network requirements. Thus, it is not recommended that this be configured. While technically possible, setting the threshold to "infinity" would mean the router would never use the SPT, which is generally not the intended behavior.
STIGDate
Cisco ACI Router Security Technical Implementation Guide2025-06-18

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (13) 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.

MON-01Continuous Monitoring
1.00
MON-01.1Intrusion Detection & Prevention Systems (IDS & IPS)
1.00
MON-01.3Inbound & Outbound Communications Traffic
1.00
MON-01.4System Generated Alerts
1.00
MON-01.8Security Event Monitoring
1.00
NET-01Network Security Controls (NSC)
1.00
NET-02Layered Network Defenses
1.00
SEA-01Secure Engineering Principles
1.00
SEA-02Alignment With Enterprise Architecture
1.00
CAP-01Capacity & Performance Management
0.50

+3 more (top 10 by confidence shown)

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (36) 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-10Concurrent Session Control
1.00
AC-17(9)Disconnect or Disable Access
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3Access Enforcement
1.00
AC-4Information Flow Enforcement
1.00
AC-6(9)Log Use of Privileged Functions
1.00
AU-12Audit Record Generation
1.00
AU-3Content of Audit Records
1.00
AU-5Response to Audit Logging Process Failures
1.00
CM-11(2)Software Installation with Privileged Status
1.00

+26 more (top 10 by confidence shown)

CCI1 mapping
CCI-002385
1.00
NIST CSF 2.00 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.

DE.CM-01
1.00
PR.IR-01
1.00
PR.IR-04
0.50

Who does this work

12 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-272093r1113999_chk)

Review the configuration to verify the SPT switchover threshold is not explicitly configured. If the "ip pim spt-threshold <value> command is configured for any value other than zero, this is a finding.

Fix Text (F-76050r1063675_fix)

Remove the "ip pim spt-threshold" from the configuration. apic(config)# no ip pim spt-threshold <value>