CISC-ND-001030 - The Cisco switch must be configured to synchronize its clock with the primary and secondary time sources using redundant authoritative time sources.
Information
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 use 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:SW2(config)#ntp server x.x.x.x
SW2(config)#ntp server y.y.y.y
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_IOS_Switch_Y22M10_STIG.zip
Item Details
Audit Name: DISA STIG Cisco IOS Switch NDM v2r4
Category: AUDIT AND ACCOUNTABILITY
References: 800-53|AU-8(2), 800-53|AU-8b., CAT|II, CCI|CCI-001889, CCI|CCI-001890, CCI|CCI-001893, Rule-ID|SV-220601r835084_rule, STIG-ID|CISC-ND-001030, STIG-Legacy|SV-110431, STIG-Legacy|V-101327, Vuln-ID|V-220601
Plugin: Cisco
Control ID: 0dd8bb30c3f5f13fc1a91aadcb623bb7bd08c8ff12c913773cafb6121fc56c06