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110 Configuring System Information
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Resetting the Device Using the CLI
1
If you are not already in the Privileged User EXEC mode of the CLI, enter
enable
.
2
If you want to save any changes made to the running configuration of the device, enter
copy
running-config startup-config
.
3
Enter
reload
.
4
Press
y
when asked if you want to continue.
Configuring SNTP Settings
The device supports the Simple Network Time Protocol (SNTP). SNTP assures accurate network
device clock time synchronization up to the millisecond. Time synchronization is performed by a
network SNTP server. The device operates only as an SNTP client and cannot provide time services
to other systems.
Time sources are established by Stratums. Stratums define the accuracy of the reference clock. The
higher the stratum (where zero is the highest), the more accurate the clock. The device receives
time from stratum 1 and above.
The following is an example of stratums:
•
Stratum 0
— A real time clock is used as the time source, for example, a GPS system.
•
Stratum 1
— A server that is directly linked to a Stratum 0 time source is used. Stratum 1
time servers provide primary network time standards.
•
Stratum 2
— The time source is distanced from the Stratum 1 server over a network path. For
example, a Stratum 2 server receives the time over a network link, via NTP, from a Stratum 1
server.
Information received from SNTP servers is evaluated based on the time level and server type.
SNTP time definitions are assessed and determined by the following time levels:
•
T1
— Time at which the original request was sent by the client.
•
T2
— Time at which the original request was received by the server.
•
T3
— Time at which the server sent a reply.
•
T4
— Time at which the client received the server's reply.
The device can poll the following server types for the server time: Unicast, Anycast and Broadcast.
Polling for Unicast information is used for polling a server for which the IP address is known. SNTP
servers that have been configured on the device are the only ones that are polled for
synchronization information. T1-T4 are used to determine server time. This is the preferred
method for synchronizing device time because it is the most secure method. If this method is
selected, SNTP information is accepted only from SNTP servers defined on the device using the
SNTP Servers
page.