The secret key is shared by both the controller and an external NTP server. NTP authentication works by using a symmetric key which is configured by the user. The Network Time Protocol adds security to an NTP client by authenticating the server before synchronizing the local clock. Ntp server ipaddr Configuring NTP Authentication Select (check) the iburst mode, if desired. If an NTP server is unresponsive, the iburst mode continues to send frequent queries until the server responds and time synchronization starts. The iburst mode is a configurable option and not the default behavior for the controller, as this option is considered “aggressive” by some public NTP servers. (When iburst mode is not enabled, only one query is sent within the first minute to the NTP server.) After the first minute, the iburst mode typically synchronizes the clock so that queries need to be sent at intervals of 64 seconds or more. The iburst mode sends up ten queries within the first minute to the NTP server. Configure the controller to set its system clock using NTP by configuring one or more NTP servers.įor each NTP server, you can optionally specify the NTP iburst mode for faster clock synchronization. You can use NTP to synchronize the controller to a central time source. To set the time zone and daylight savings time adjustment, enter the following commands in configure mode: To set the date and time, enter the following command in privileged mode: Additional fields appear that allow you to set the offset from UTC, and the start and end recurrences. To adjust the clock for daylight savings time, click Enabled under Summer Time. Under Time Zone, enter the name of the time zone and the offset from Greenwich Mean Time (GMT). Under Controller Date/Time, set the date and time for the clock. Navigate to the Configuration > Management > Clock page. You can use either the WebUI or CLI to manually set the time on the controller’s clock. You can set the clock on a controller manually or by configuring the controller to use a Network Time Protocol (NTP) server to synchronize its system clock with a central time source. (El Niño has the opposite effect in the Pacific, reducing the amount of wind shear.)Īt the same time, this year’s heightened sea surface temperatures pose a number of threats, including the ability to supercharge storms.Setting the System Clock Setting the System Clock Hurricanes need a calm environment to form, and the instability caused by increased wind shear makes those conditions less likely. In the Atlantic, El Niño increases the amount of wind shear, or the change in wind speed and direction from the ocean or land surface into the atmosphere. The intermittent climate phenomenon can have wide-ranging effects on weather around the world, and it typically impedes the formation of Atlantic hurricanes. This year features an El Niño pattern, which arrived in June. ( A record 30 named storms formed in 2020.) There were 14 named storms last year, after two extremely busy Atlantic hurricane seasons in which forecasters ran out of names and had to resort to backup lists. 10, NOAA officials revised their estimate upward, to 14 to 21 storms. In late May, the National Oceanic and Atmospheric Administration predicted that there would be 12 to 17 named storms this year, a “near-normal” amount. Lee is the 12th named storm to form in the Atlantic in 2023. Lee was a post-tropical cyclone in the Gulf of Saint Lawrence with sustained wind speeds of 45 miles per hour, the National Hurricane Center said in its latest advisory.
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