Setting and Viewing Clock Time
You can set the following time-related parameters for the VNswitch module:
current time, time zone offset (from GMT), and the frequency with which the module
synchronizes with the time host when using a Network Time Protocol (NTP) server.
You can set current time on the VNswitch module clock manually or using an
NTP server. You can also view the current settings to verify that they are set as desired.
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Setting
the Time Manually
You can set the VNswitch module clock manually, based on the current wall
clock time.
Procedure:
Step |
Action |
1 |
Select Telnet to Module from the
application tree and connect to the module. |
2 |
At the Main prompt (Main>),
enter Config. |
3 |
Press Return. At the Config prompt (Config>), enter time set. |
4 |
Press Return. The following message is
displayed: year [0]? |
5 |
Enter the numeric representation for the
current year using the full four digits. Example: 1998 |
6 |
Press Return. The following message is
displayed: month [0]? |
7 |
Enter the numeric representation for the
current month. Do not use leading zeros. Example: 5 (for May) or 11
(for November) |
8 |
Press Return. The following message is
displayed: date [0]? |
9 |
Enter the current day of the month. Example:
22 |
10 |
Press Return. The following message is
displayed: hour [0]? |
11 |
Enter the current hour of the day in
military time. Example: 5 (for 5 AM) or 17 (for
5 PM) |
12 |
Press Return. The following message is
displayed: minute [0]? |
13 |
Enter the current minute of the hour. Example:
45 |
14 |
Press Return. The following message is
displayed: second [0]? |
15 |
Enter the current second of the minute. Example:
00 |
16 |
Press Return. The clock is set. |
17 |
Log out of the Telnet session and terminate
the connection. |
Note: Alternatively, you can enter the
above time using the following syntax:
time set 1998 11 22 17 45 00
Setting the Time Using an NTP Server
An NTP server provides a single-source location from which multiple
devices can derive their clock settings. This helps ensure time synchronization among
participating devices. The NTP server is based on Greenwich Mean Time (GMT).
Procedure:
Step |
Action |
1 |
Select Telnet to Module from the
application tree and connect to the module. |
2 |
At the Main prompt (Main>),
enter Config. |
3 |
Press Return. At the Config prompt (Config>), enter time host. |
4 |
Press Return. The following message is
displayed: IP address of time host [0.0.0.0]? |
5 |
Enter the IP address of the NTP server from
which you want to derive the current time. |
6 |
Press Return. The clock is set and the
Config prompt is displayed. |
7 |
Restart the module if you want the new
configuration settings to take effect. |
8 |
Log out of the Telnet session and terminate
the connection. |
Setting the Time Zone Offset
You can specify the time zone by setting the number of minutes that the
current time is offset from Greenwich Mean Time (GMT). Values west of GMT are entered as
negative values. For example, Eastern Standard Time (EST) in the United States is 5 hours
earlier than GMT. Therefore, the offset for EST is -300 (5 hours x 60 minutes/hour). The
default of 0 (zero) indicates no offset from GMT.
Procedure:
Step |
Action |
1 |
Select Telnet to Module from the
application tree and connect to the module. |
2 |
At the Main prompt (Main>),
enter Config. |
3 |
Press return. At the Config prompt (Config>), enter time offset. |
4 |
Press Return. The following message is
displayed: minutes from GMT (-720 to 720) [0]? |
5 |
Enter the number of minutes the time zone
is offset from GMT. |
6 |
Press Return. The time zone offset is
configured and the Config prompt is displayed. |
7 |
Log out of the Telnet session and terminate
the connection. |
Note: Alternatively, you can enter
the time zone offset using the following syntax:
time offset -300
Setting Time Host Synchronization
You can set the frequency, in seconds, with which the VNswitch module
polls the time host for the current time. This function is applicable only if you
are using an NTP server to synchronize the VNswitch module clock. The default of 0 (zero)
indicates the switch is not to poll the time host.
You must configure TCP/IP Host Services for this functionality to be
operational. See Configuring IP Host Services for information.
Procedure:
Step |
Action |
1 |
Select Telnet to Module from the
application tree and connect to the module. |
2 |
At the Main prompt (Main>),
enter Config. |
3 |
Press Return. At the Config prompt (Config>), enter time sync. |
4 |
Press Return. The following message is
displayed: seconds between time sync [0]? |
5 |
Enter the number of seconds that is to pass
between polling attempts. |
6 |
Press Return. The frequency is set and the
Config prompt is displayed. |
7 |
Restart the module if you want the new
configuration settings to take effect. |
8 |
Log out of the Telnet session and terminate
the connection. |
Viewing Clock Time Parameters
You can view the current time settings to verify that they are set as
desired. It includes information about who and what last set the time (either the
operator, or the IP address of the host).
Procedure:
Step |
Action |
1 |
Select Telnet to Module from the
application tree and connect to the module. |
2 |
At the Main prompt (Main>),
enter Config. |
3 |
Press Return. At the Config prompt (Config>), enter time list. |
4 |
Press Return. A report of the current time
settings is displayed, and the Config prompt is displayed. Example:
Config> time list
11:21:21 Monday February 16, 1998
Set By: 110.110.110.157
Time Host: 110.110.110.157
Sync Interval: 1200 seconds
GMT Offset: -240 minutes |
5 |
Log out of the
Telnet session and terminate the connection. |
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