HP BladeSystem bc2200 Embedded Web System User Guide for the HP BladeSystem PC - Page 21

Configuring System Time ◆ Month - The month of the year in which DST ends every year. The possible field range is Jan-Dec. ◆ Time - The time at which DST ends every year. The field format is HH:MM. For example, 05:30. 2. Define the Date, Local Time, and Time Zone Offset fields. 3. To configure the device to automatically switch to DST, select Daylight Saving and select either USA, European, or Other. If you select Other, you must define its From and To fields. To configure DST parameters that will recur every year, select Recurring and define its From and To fields. 4. Click . The DST settings are saved, and the device is updated. Configuring SNTP The device supports the Simple Network Time Protocol (SNTP). SNTP assures accurate network device clock time synchronization up to a 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 device receives time from stratum 1 and above. The following is an example of stratums: ■ Stratum 0 - A real time clock (such as a GPS system) is used as the time source. ■ 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. Message Digest 5 (MD5) Authentication safeguards device synchronization paths to SNTP servers. MD5 is an algorithm that produces a 128-bit hash. MD5 is a variation of MD4, and increases MD4 security. MD5 verifies the integrity of the communication and authenticates the origin of the communication. This section contains the following topics: ■ Defining SNTP Global Settings ■ Defining SNTP Authentication Embedded Web System User Guide www.hp.com 3-5