S series switches (except S1700 switches) select an NTP server as follows:
Question:
After an NTP server is configured for S1, S2 configures S1 and the NTP server as active/standby NTP servers and sets the priority of S1 to be higher than that of the NTP server. Which NTP server takes effect for S2?
Answer:
S1, as an NTP client, belongs to an NTP server. When both S1 and the NTP server are configured as the NTP servers for S2, the priority of S1 is lower than the priority of the NTP server regardless of the priority settings on S2. Therefore, the NTP server of S1 takes effect for S2. The NTP server priority settings only take effect for the NTP servers irrelevant to each other.
It is a synchronization mode between NMS time and NE time.
With the time synchronization function, the NE time is kept consistent with the NMS time. This allows the NMS to record the correct time at which alarms occur and the correct time at which abnormal events are reported by NEs.
When NEs report alarms and abnormal events to the NMS, the NMS records the time of alarms and events based on the NE time. If the NE time is incorrect, the generation time of alarms recorded on the NMS is also incorrect, which may cause troubles in fault locating. The same case happens to the generation time of abnormal events that are recorded in the NE security log. To ensure the accuracy of NE time, the NMS provides two time synchronization modes with the following servers: the NMS server and the standard NTP server.
Note:
The Web LCT improves the accuracy of NE time by synchronizing the NE time with the NMS time.
If synchronization with the NMS server is applied, all NEs use the NMS server time as the standard time, and can be synchronized with the NMS server manually or automatically. The NMS time refers to the time of the workstation where the NMS server resides or system time of the NMS server. This synchronization mode is easy and applies to a network with relatively low requirement on time accuracy.
If synchronization with the standard NTP server is applied, all NEs and the NMS are synchronized with the standard NTP server automatically. The standard NTP server can be the NMS server or a dedicated time server. This synchronization mode makes the NE time and NMS time accurate to 1/1000,000,000 seconds and applies to a network that has a high requirement on time accuracy.
The default time zone of iMana/iBMC is the GMT time zone. The time zone and time synchronization policy is as follows:
iMana and iBMC of rack servers synchronize time with the BIOS every minute but does not synchronize the time zone. Therefore, if the iMana/iBMC time is different from the OS time, the difference is caused by different time zone settings.
iMana/iBMC of blade servers (E9000 and E6000) synchronize time with the management module every hour. The management module supports NTP settings for time synchronization.
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