Cisco Catalyst 4500 Series, Software Configuration Manual

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 4 Administering the Switch
Managing the System Time and Date
Displaying the Time and Date Configuration
To display the time and date configuration, use the show clock [ detail ] privileged EXEC command.
The system clock keeps an authoritative flag that shows whether the time is authoritative (believed to be
accurate). If the system clock was set by a timing source such as NTP, the flag is set. If the time is not
authoritative, it is used only for display purposes. Until the clock is authoritative and the
authoritative
flag is set, the flag prevents peers from synchronizing to the clock when the peers’ time is invalid.
The symbol that precedes the show clock display has this meaning:
•
*—Time is not authoritative.
•
(blank)—Time is authoritative.
•
.—Time is authoritative, but NTP is not synchronized.
Configuring the Time Zone
To manually configure the time zone, perform this task:
The minutes-offset variable in the clock timezone global configuration command is available for those
cases where a local time zone is a percentage of an hour different from UTC. For example, the time zone
for some sections of Atlantic Canada (AST) is UTC-3.5, where the 3 means 3 hours and .5 means 50
percent. The necessary command is
clock timezone AST -3 30 .
Command Purpose
Step 1
configure terminal
Enters global configuration mode.
Step 2
clock timezone zone hours-offset
[
minutes-offset
]
Sets the time zone.
To set the time to UTC, use the no clock timezone global configuration
command.
The switch keeps internal time in universal time coordinated (UTC), so
this command is used only for display purposes and when the time is
manually set.
• For zone , enter the name of the time zone to be displayed when
standard time is in effect. The default is UTC.
•
For hours-offset , enter the hours offset from UTC.
• (Optional) For minutes-offset , enter the minutes offset from UTC.
Step 3
end
Returns to privileged EXEC mode.
Step 4
show running-config
Verifies your entries.
Step 5
copy running-config startup-config
(Optional) Saves your entries in the configuration file.