The Arista network device must be configured to synchronize internal system clocks using redundant authenticated time sources.
An XCCDF Rule
Description
<VulnDiscussion>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. Satisfies: SRG-APP-000373-NDM-000298, SRG-APP-000374-NDM-000299, SRG-APP-000375-NDM-000300, SRG-APP-000395-NDM-000347</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-255958r882216_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Configure the Arista network device for at least two trusted time sources and to use cryptographic authentication with the following command example:
switch#config
switch(config)#ntp authentication-key 12 sha1 0 <key>
switch(config)#ntp trusted-key 12
switch(config)#ntp authenticate servers