Setting The Date And Time; Time Zones; Time Synchronization; Synchronizing Local Time Using Ntp - Brocade Communications Systems VDX 6940 Series Hardware Installation Manual

For more information on changing the VCX ID and the vcs vcs-id command, refer to the
Network OS Administration Guide .

Setting the date and time

Brocade devices maintain the current date and time inside a real-time clock (RTC) circuit. Date and time are used for logging events. The
device does not depend on the date and time for its operation; even with an incorrect date and time value, the device functions properly.
However, because the date and time are used for logging, error detection, and troubleshooting, you should set them correctly.

Time zones

You can set the time zone for the device by using the clock timezone command. The time zone setting has the following characteristics:
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The clock timezone setting automatically adjusts for Daylight Savings Time.
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Changing the time zone on a device updates the local time zone setup and is reflected in local time calculations.
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By default, all devices are in the Greenwich Mean Time (GMT) time zone (0,0). If all devices in a fabric are in one time zone, it is
possible for you to keep the time zone setup at the default setting.
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System services that have already started will reflect the time zone changes only after the next reboot.
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Time zone settings persist across failover for high availability.
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Time zone settings are not affected by Network Time Protocol (NTP) server synchronization.
The following regions are supported: Africa, America, Antarctica, Asia, Atlantic, Australia, Europe, Indian, and Pacific. One of these, along
with a city name, establishes the time zone.

Time synchronization

To keep the time in your network current, it is recommended that the principal switch has its time synchronized with at least one external
NTP server. The other devices in the fabric will automatically take their time from the principal switch.
All devices in the fabric maintain the current clock server value in nonvolatile memory. By default, this value is the local clock server of
the principal switch. Changes to the clock server value on the principal switch are propagated to all switches in the fabric.
When a new device enters the fabric, the time server daemon of the principal switch sends out the addresses of all existing clock servers
and the time to the new device.
The ntp server command accepts multiple server addresses in IPv4 format. When multiple NTP server addresses are passed, ntp server
sets the first obtainable address as the active NTP server. If there are no reachable time servers, then the local time is the default time.

Synchronizing local time using NTP

Perform the following steps to synchronize the local time using NTP.
1. Log in to the device using the admin account (the default password is password).
2. Enter configure terminal to change to global configuration mode
device# configure terminal
Entering configuration mode terminal
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Network OS Command Reference and
Brocade VDX 6940 Hardware Installation Guide
Initial Configuration
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