Version 7.0 137 Mediant 3000
User's Manual 12. Date and Time
12 Date and Time
The date and time of the device can be configured manually or it can be obtained
automatically from a Simple Network Time Protocol (SNTP) server.
12.1 Configuring Automatic Date and Time using SNTP
The device's Simple Network Time Protocol (SNTP) client functionality generates requests
and reacts to the resulting responses using the NTP Version 3 protocol definitions
(according to RFC 1305). Through these requests and responses, the device, as an NTP
client, synchronizes the system time to a time source within the network, thereby
eliminating any potential issues should the local system clock 'drift' during operation. The
NTP client follows a simple process in managing system time: the NTP client requests an
NTP update, receives an NTP response, and then updates the local system clock based on
an NTP server within the network. The client requests a time update from the user-defined
NTP server (IP address or FQDN) at a user-defined update interval. Typically, this update
interval is every 24 hours based on when the system was restarted.
You can also configure the device to authenticate and validate the NTP messages received
from the NTP server. Authentication is done using an authentication key with the MD5
cryptographic hash algorithm. When this feature is enabled, the device ignores NTP
messages received without authentication.
The following procedure describes how to configure SNTP. For detailed descriptions of the
configuration parameters, see ''NTP and Daylight Saving Time Parameters'' on page 854.
 To configure SNTP using the Web interface:
1. Open the Time and Date page (Configuration tab > System menu > Time And
Date), and then scroll down to the 'NTP Sever' group:
Figure 12-1: NTP Parameters on Time and Date Page
2. Configure the NTP server address:
• In the 'Primary NTP Server Address' (NTPServerIP) field, configure the primary
NTP server's address (IP or FQDN).
• In the 'Secondary NTP Server Address' (NTPSecondaryServerIP) field, configure
the secondary NTP server.
3. In the 'NTP Updated Interval' (NTPUpdateInterval) field, configure the period after
which the date and time of the device is updated.
4. Open the Application Settings page (Configuration tab > System menu >
Application Settings), and then scroll down to the 'NTP Settings' group:
Figure 12-2: NTP Authentication Parameters on Application Settings Page
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