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1.24 CISC-ND-001030

Warning! Audit Deprecated

This audit has been deprecated and will be removed in a future update.

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Information

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

GROUP ID: V-220498
RULE ID: SV-220498r1026071

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.

Solution

Configure the Cisco switch to synchronize its clock with redundant authoritative time sources as shown in the example below:

SW1(config)# feature ntp
SW1(config)# ntp server 10.1.12.10
SW1(config)# ntp server 10.1.22.13
SW1(config)# end

See Also

https://workbench.cisecurity.org/benchmarks/23773

Item Details

References: CAT|II, CCI|CCI-001891, CCI|CCI-004922, CCI|CCI-004923, CCI|CCI-004928, Rule-ID|SV-220498r1026071_rule, STIG-ID|CISC-ND-001030, Vuln-ID|V-220498

Plugin: Cisco

Control ID: 326e0cd97c0b4f7ed3f489129ebb2e9ab1cf6d1569c7d4a9545799b0d18290e6