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The following is an example of the CLI command:
Console >reload
This command will reset the whole system and disconnect your
current
session. Do you want to continue (y/n) [n] ?
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.
The device can poll the following server types for the server time:
•
Unicast
•
Anycast
•
Broadcast
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 switch 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 — The time at which the original request was sent by the client.
•
T2 — The time at which the original request was received by the server.
•
T3 — The time at which the server sent the client a reply.
•
T4 — The time at which the client received the server's reply.
Polling for Unicast Time Information
Polling for Unicast information is used for polling a server for which the IP address is known. T1 - T4 are
used to determine the server time. This is the preferred method for synchronizing switch time.
Polling for Anycast Time Information
Configuring System Information
79
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