System Management
Basic System Configuration Guide 235
DNS Security Extensions
DNS Security (DNSSEC) Extensions are now implemented in the SR OS, allowing operators
to configure DNS behavior of the router to evaluate whether the Authenticated Data bit was
set in the response received from the recursive name server and to trust the response, or ignore
it.
System Time
SR-series routers are equipped with a real-time system clock for time keeping purposes.
When set, the system clock always operates on Coordinated Universal Time (UTC), but the
SR-series routers OS software has options for local time translation as well as system clock
synchronization.
System time parameters include:
• Time Zones
• Network Time Protocol (NTP)
• SNTP Time Synchronization
• CRON
Time Zones
Setting a time zone in SR OS allows for times to be displayed in the local time rather than in
UTC. The SR OS has both user-defined and system defined time zones.
A user-defined time zone has a user assigned name of up to four printable ASCII characters
in length and unique from the system-defined time zones. For user-defined time zones, the
offset from UTC is configured as well as any summer time adjustment for the time zone.
The SR OS system-defined time zones are listed in Table 29 which includes both time zones
with and without summer time correction.
Table 29: System-defined Time Zones
Acronym Time Zone Name UTC Offset
Europe
GMT Greenwich Mean Time UTC
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