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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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3-8. Time and Calendar

  • System time is maintained by the software. When a switch is initialized, the system time is set from a hardware time clock (system calendar) in the switch.

  • An accurate system clock is important to maintain, especially when you need to compare the output of logging and debugging features. A switch timestamps these messages, giving you a frame of reference.

  • System time is maintained as coordinated universal time (UTC, also known as Greenwich mean time,GMT). The format of time as it is displayed can be configured with operating system commands.

  • System time can be set manually or by Network Time Protocol (NTP). In addition, the hardware time clock in a switch can be updated by NTP if desired.

  • NTP uses a concept of stratum to determine ...

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