The Cisco Multicast Source Discovery Protocol (MSDP) switch must be configured to use a loopback address as the source address when originating MSDP traffic.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-221147	CISC-RT-000950	SV-221147r999776_rule	CCI-004931	low
Description
Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of MSDP switches. It is easier to construct appropriate ingress filters for switch management plane traffic destined to the network management subnet since the source addresses will be from the range used for loopback interfaces instead of a larger range of addresses used for physical interfaces. Log information recorded by authentication and syslog servers will record the switch’s loopback address instead of the numerous physical interface addresses.
STIG			Date
Cisco NX OS Switch RTR Security Technical Implementation Guide			2026-03-04

Related Frameworks

1 mapping across 3 frameworks

SCF0 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.

BCD-10.4Alternate Communications Channels

1.00

DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)
SCF Secure Traceability Relationship Mapping (STRM)2026.2equal to

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 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.

SC-47Alternate Communications Paths

1.00

DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-5(2)Capacity, Bandwidth, and Redundancy

1.00

DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7Boundary Protection

1.00

DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7(11)Restrict Incoming Communications Traffic

1.00

DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7(29)Separate Subnets to Isolate Functions

1.00

DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

CCI1 mapping

CCI-004931

1.00

DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)

Details

Check Text (C-221147r999776_chk)

Step 1: Review the switch configuration to verify that a loopback address has been configured. interface Loopback12 ip address x.12.2.2/32 Step 2: Verify that the loopback interface is used as the source address for all MSDP packets generated by the switch. ip msdp peer x.44.2.34 connect-source Loopback12 remote-as nn If the switch does not use its loopback address as the source address when originating MSDP traffic, this is a finding.

Fix Text (F-22851r409931_fix)

Configure the switch to use its loopback address is used as the source address when sending MSDP packets. SW1(config)# ip msdp peer x.44.2.34 connect-source lo12 remote-as nn