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The Juniper EX switch must be configured to synchronize internal information system clocks using redundant authoritative time sources.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-253920JUEX-NM-000430SV-253920r1018769_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
Juniper EX Series Switches Network Device Management Security Technical Implementation Guide2026-06-15

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-253920r1018769_chk)

Determine if the network device is configured to synchronize internal information system clocks with the primary and secondary time sources. Verify the Network Time Protocol (NTP) configuration. [edit system ntp] authentication-key 1 type sha256 value "PSK"; ## SECRET-DATA authentication-key 2 type sha1 value "PSK"; ## SECRET-DATA server <address 1> key 1 prefer; ## SECRET-DATA server <address 2> key 2; ## SECRET-DATA trusted-key [ 1 2 ]; source-address <lo0 or OOBM address>; If the network device is not configured to synchronize internal information system clocks with the primary and secondary time sources, this is a finding.

Fix Text (F-57323r843792_fix)

Configure the network device to synchronize internal information system clocks with the primary and secondary time sources. set system ntp authentication-key 1 type sha256 set system ntp authentication-key 1 value "PSK" set system ntp authentication-key 2 type sha1 set system ntp authentication-key 2 value "PSK" set system ntp server <address 1> key 1 set system ntp server <address 1> prefer set system ntp server <address 2> key 2 set system ntp trusted-key 1 set system ntp trusted-key 2 set system ntp source-address <lo0 or OOBM address>