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Cisco Intrusion Prevention System CLI Sensor Configuration Guide for IPS 7.1
OL-19892-01
Chapter 4 Setting Up the Sensor
Configuring Time
Displaying the System Clock
Use the show clock [detail] command to display the system clock. You can use the detail option to
indicate the clock source (NTP or system) and the current summertime setting (if any). The system clock
keeps an authoritative flag that indicates whether the time is authoritative (believed to be accurate). If
the system clock has been set by a timing source, such as NTP, the flag is set.
Table 4-1 lists the system clock flags.
To display the system clock, follow these steps:
Step 1 Log in to the CLI.
Step 2 Display the system clock.
sensor# show clock
*19:04:52 UTC Thu Apr 03 2008
Step 3 Display the system clock with details. The following example indicates that the sensor is getting its time
from NTP and that is configured and synchronized.
sensor# show clock detail
20:09:43 UTC Thu Apr 03 2011
Time source is NTP
Summer time starts 03:00:00 UTC Sun Mar 09 2011
Summer time stops 01:00:00 UTC Sun Nov 02 2011
Step 4 Display the system clock with details. The following example indicates that no time source is configured.
sensor# show clock detail
*20:09:43 UTC Thu Apr 03 2011
No time source
Summer time starts 03:00:00 UTC Sun Mar 09 2011
Summer time stops 01:00:00 UTC Sun Nov 02 2011
Manually Setting the System Clock
Note You do not need to set the system clock if your sensor is synchronized by a valid outside timing
mechanism such as an NTP clock source.
Use the clock set hh:mm [:ss] month day year command to manually set the clock on the appliance. Use
this command if no other time sources are available. The clock set command does not apply to the
following platforms, because they get their time from the adaptive security appliance in which they are
installed:
Table 4-1 System Clock Flags
Symbol Description
* Time is not authoritative.
(blank) Time is authoritative.
. Time is authoritative, but NTP is not synchronized.