![]() ![]() NTP uses the concept of a stratum to describe how many NTP hops away a device is from an authoritative time source. Minute is necessary to synchronize two devices to within a millisecond of one another. NTP is extremely efficient no more than one packet per NTP then distributes this time across the network. NTP runs over User Datagram Protocol (UDP), which runs overĪn NTP network usually gets its time from an authoritative time source, such as a radio clock or an atomic clock attached The NTP is designed to time-synchronize a network of devices. Time is available only for display purposes and is not redistributed. The system clock keeps track of whether the time is authoritative or not (that is, whether it has been set by a time source considered to be authoritative). You can configure information about the local time zone and summer time (daylight saving time) so that the time appears ![]() The system clock keeps track of time internally based on Coordinated Universal Time (UTC), also known as Greenwich Mean Time The system clock can provide time to these services: The system clock can then be set from these sources: This clock runs from the moment the system starts up and keeps track of The basis of the time service is the system clock. You can manage the system time and date on your device using automatic configuration methods (RTC and NTP), or manual configurationįor complete syntax and usage information for the commands used in this section, see the Cisco IOS Configuration Fundamentals Command Reference on. Information About Administering the Device Feature History for Device Administration.Additional References for Device Administration.Example: Configuring Unicast MAC Address Filtering.Example: Adding the Static Address to the MAC Address Table.Example: Configuring MAC Threshold Notification Traps.Example: Configuring MAC Address Change Notification Traps.Configuration Examples for Device Administration.Monitoring and Maintaining Administration of the Device.Configuring Unicast MAC Address Filtering. ![]() Adding and Removing Static Address Entries.Configuring MAC Threshold Notification Traps.Configuring MAC Address Move Notification Traps.Configuring MAC Address Change Notification Traps.Configuring a Message-of-the-Day Login Banner.Disabling NTP Services on a Specific Interface.Creating an Access Group and Assigning a Basic IP Access List.Configuring Broadcast-Based NTP Associations.Configuring Poll-Based NTP Associations.Configuring Summer Time (Daylight Saving Time).Default System Name and Prompt Configuration.Information About Administering the Device. ![]()
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