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The Cisco router must be configured to synchronize its clock with the primary and secondary time sources using redundant authoritative time sources.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-216535CISC-ND-001030SV-216535r1015296_ruleCCI-004928medium
Description
The loss of connectivity to a particular authoritative time source will result in the loss of time synchronization (free-run mode) and increasingly inaccurate time stamps on audit events and other functions. Multiple time sources provide redundancy by including a secondary source. Time synchronization is usually a hierarchy; clients synchronize time to a local source while that source synchronizes its time to a more accurate source. The network device must utilize an authoritative time server and/or be configured to use redundant authoritative time sources. This requirement is related to the comparison done in CCI-001891. DOD-approved solutions consist of a combination of a primary and secondary time source using a combination or multiple instances of the following: a time server designated for the appropriate DOD network (NIPRNet/SIPRNet); United States Naval Observatory (USNO) time servers; and/or the Global Positioning System (GPS). The secondary time source must be located in a different geographic region than the primary time source.
STIGDate
Cisco IOS XR Router NDM Security Technical Implementation Guide2025-05-19

Related Frameworks

4 mappings 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.

MON-07.1Synchronization With Authoritative Time Source
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (15) 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-17(9)Disconnect or Disable Access
1.00
AC-2(3)Disable Accounts
1.00
AU-8Time Stamps
1.00
AU-8(1)Synchronization with Authoritative Time Source
1.00
AU-8(2)Secondary Authoritative Time Source
1.00
AU-9Protection of Audit Information
1.00
CM-6Configuration Settings
1.00
CM-6(1)Automated Management, Application, and Verification
1.00
IA-2(6)Access to Accounts —separate Device
1.00
IA-3(1)Cryptographic Bidirectional Authentication
1.00

+5 more (top 10 by confidence shown)

CCI4 mappings
CCI-001893
1.00
CCI-004922
1.00
CCI-004923
1.00
CCI-004928
1.00

Details

Check Text (C-216535r1015296_chk)

Review the Cisco router configuration to verify that it is compliant with this requirement as shown in the configuration example below. ntp server x.x.x.x ntp server y.y.y.y If the Cisco router is not configured to synchronize its clock with redundant authoritative time sources, this is a finding.

Fix Text (F-17767r288292_fix)

Configure the Cisco router to synchronize its clock with redundant authoritative time sources as shown in the example below. RP/0/0/CPU0:R3 (config)#ntp server x.x.x.x RP/0/0/CPU0:R3 (config)#ntp server y.y.y.y