Details
If local time zones are configured on network infrastructure, it is important to also configure the time ‘shift’ that occurs as a result of Daylight Savings Time.
Rationale:
Impact:
If local time zones are configured on network infrastructure, it is usually to simplify relating reported end-user issues back to local time entries in the logs. So if local time zones are configured and used in this manner, it becomes important to also configure the time ‘shift’ that occurs as a result of Daylight Savings Time (or ‘summer-time’ on the Cisco CLI)
Solution
In most cases, just the name of the DST timezone name is sufficient. NX-OS assumes 1 hour offset, using the United States dates for DST.
switch(config)# clock summer-time
for example:
switch(config)# clock summer-time EDT
If a full definition of the change is needed, it can certainly be set:
switch(config)# clock summer-time
where:
day1, month1, time1 define the start of the DST period
day2, month2, time2 define the end of the DST period
Default Value:
By default, summer-time (Daylight Savings Time) is not configured. If the summer-time start and stop dates are not specified, then the US standard dates are used: start = 2 Sun Mar 02:00 stop = 1 Sun Nov 02:00 60
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Audit and Accountability.This control applies to the following type of system Cisco.