Why there is no option to change Daylight Saving Time (DST) in 7.x series?

Asset ID:	1-71-2070323.1
Update Date:	2017-06-12
Keywords:

Solution Type Technical Instruction Sure

Solution 2070323.1 : Why there is no option to change Daylight Saving Time (DST) in 7.x series?

Applies to:

Acme Packet 6100 - Version S-Cz7.2.0 and later
Acme Packet 3820 - Version S-Cz7.1.5 and later
Acme Packet 6300 - Version S-Cz7.1.2 and later
Acme Packet 4500 - Version E-Cz7.3.0 and later
Acme Packet 1100 - Version E-Cz7.2.0 and later
Information in this document applies to any platform.

Goal

In 7.x series the "show timezone" works differently from 6.x series. How can the timezone be set in 7.x?

Solution

Earlier, in 6.x series, the "show timezone" would give the following output:

ACMELAB# show timezone
Timezone name: ist
Minutes from UTC(negative if past UTC): -120
Date and hour daylight saving time begins(mmddHH): 032702
Date and hour daylight saving time ends(mmddHH): 102502

I was able to test this in the following 6.x series:

ACME Net-Net 3820 Firmware SCX6.1.0 MR-7 Patch 5
ACME Net-Net 3800 Firmware SCX6.4.0 MR-6 GA
ACME Net-Net 4500 Firmware SCX6.4.0 MR-7 =======> being the latest version as of today

Here, there was a option to change DST setting. You could refer the section 'Manually Setting Timezone' in the config guide to know more about this.

When it came to 7.x series, the timezone set under 7.x (such as 712, 720, 730 series) with any maintenance release (either the Service Provider version or the Enterprise version) is linked to the Linux kernel. There is no option to view or set the DST separately.

In the 7.x series, the same command will give the output as follows:

ACMELAB# show timezone
Asia/Jerusalem

I have tested it in the following versions:

Acme Packet Net-Net 6300 SCZ7.1.2 MR-5 Patch 2 (WS Build 641)
Acme Packet Net-Net 4500 SCZ7.2.0 MR-4 GA (Build 370)
Acme Packet Net-Net 6100 SCZ7.2.0 MR-3 Patch 1 (Build 334)
Acme Packet 1100 ECZ7.3.0 GA (Build 52) GA

"timezone-set" is a CLI level command at superuser mode and it will ask you which continent you are in, then you need to select a country. If the country has multiple timezones, it will ask you which timezone you are in. With that info, it will correctly link this to the /usr/share/zoneinfo/US directory and to the proper file,
e.g. if you are in Eastern time, it will link it to /usr/share/zoneinfo/US/Eastern. The path "/usr/share/zoneinfo" is the standard Linux path.

You may also see the zoneinfo directory in the /etc folder . So, the path would be "/etc/zoneinfo/".

In this version, the system gets its information on each timezone including when the Daylight Savings Time (DST) may start and stop and will adjust the time correctly. Therefore, there is no need to set the DST separately, unlike in 6.x series.

If the timezone is set correctly in the system, then DST change will be taken care of automatically.

For further information, you would need to Enter the shell (with password vxworks) . When entering 'shell', utmost caution should be taken as any changes to files or permissions could result in other unforeseen problems with the system. Entering incorrect commands at shell can cause system instability or failure.

Type 'exit' or press ctrl-d to return to ACLI
~ #
~ #
~ # cd /etc/zoneinfo/
/etc/zoneinfo # ls -lrt
-rw-r--r--    1     18512 Feb 27 2015 zone1970.tab
-rw-r--r--    1     20050 Feb 27 2015 zone.tab
-rw-r--r--    1      3545 Feb 27 2015 posixrules
-rw-r--r--    1       127 Feb 27 2015 localtime
-rw-r--r--    1      4554 Feb 27 2015 iso3166.tab
-rw-r--r--    1       127 Feb 27 2015 Zulu
-rw-r--r--    1      1873 Feb 27 2015 WET
-rw-r--r--    1      1528 Feb 27 2015 W-SU
-rw-r--r--    1       127 Feb 27 2015 Universal
-rw-r--r--    1       127 Feb 27 2015 UTC
-rw-r--r--    1       127 Feb 27 2015 UCT
-rw-r--r--    1      2747 Feb 27 2015 Turkey
-rw-r--r--    1       428 Feb 27 2015 Singapore
-rw-r--r--    1       500 Feb 27 2015 ROK
-rw-r--r--    1       800 Feb 27 2015 ROC
-rw-r--r--    1      3453 Feb 27 2015 Portugal
-rw-r--r--    1      2705 Feb 27 2015 Poland
-rw-r--r--    1      2294 Feb 27 2015 PST8PDT
-rw-r--r--    1       414 Feb 27 2015 PRC
-rw-r--r--    1      2453 Feb 27 2015 Navajo
-rw-r--r--    1      2057 Feb 27 2015 NZ-CHAT
-rw-r--r--    1      2460 Feb 27 2015 NZ
-rw-r--r--    1      2294 Feb 27 2015 MST7MDT
-rw-r--r--    1       127 Feb 27 2015 MST
-rw-r--r--    1      2102 Feb 27 2015 MET
-rw-r--r--    1       655 Feb 27 2015 Libya
-rw-r--r--    1       237 Feb 27 2015 Kwajalein
-rw-r--r--    1       355 Feb 27 2015 Japan
-rw-r--r--    1       507 Feb 27 2015 Jamaica
-rw-r--r--    1      2265 Feb 27 2015 Israel
-rw-r--r--    1      1661 Feb 27 2015 Iran
-rw-r--r--    1      1167 Feb 27 2015 Iceland
-rw-r--r--    1      1189 Feb 27 2015 Hongkong
-rw-r--r--    1       128 Feb 27 2015 HST
-rw-r--r--    1       127 Feb 27 2015 Greenwich
-rw-r--r--    1       127 Feb 27 2015 GMT0
-rw-r--r--    1       127 Feb 27 2015 GMT-0
-rw-r--r--    1       127 Feb 27 2015 GMT+0
-rw-r--r--    1       127 Feb 27 2015 GMT
-rw-r--r--    1      3687 Feb 27 2015 GB-Eire
-rw-r--r--    1      3687 Feb 27 2015 GB
-rw-r--r--    1       264 Feb 27 2015 Factory
-rw-r--r--    1      3559 Feb 27 2015 Eire
-rw-r--r--    1      2779 Feb 27 2015 Egypt
-rw-r--r--    1      2294 Feb 27 2015 EST5EDT
-rw-r--r--    1       127 Feb 27 2015 EST
-rw-r--r--    1      1876 Feb 27 2015 EET
-rw-r--r--    1      2437 Feb 27 2015 Cuba
-rw-r--r--    1      2294 Feb 27 2015 CST6CDT
-rw-r--r--    1      2102 Feb 27 2015 CET
drwxr-xr-x    2         0 Feb 28 2015 US
drwxr-xr-x    2         0 Feb 28 2015 Pacific
drwxr-xr-x    2         0 Feb 28 2015 Mexico
drwxr-xr-x    2         0 Feb 28 2015 Indian
drwxr-xr-x    2         0 Feb 28 2015 Europe
drwxr-xr-x    2         0 Feb 28 2015 Etc
drwxr-xr-x    2         0 Feb 28 2015 Chile
drwxr-xr-x    2         0 Feb 28 2015 Canada
drwxr-xr-x    2         0 Feb 28 2015 Brazil
drwxr-xr-x    2         0 Feb 28 2015 Australia
drwxr-xr-x    2         0 Feb 28 2015 Atlantic
drwxr-xr-x    2         0 Feb 28 2015 Asia
drwxr-xr-x    2         0 Feb 28 2015 Arctic
drwxr-xr-x    2         0 Feb 28 2015 Antarctica
drwxr-xr-x    6         0 Feb 28 2015 America
drwxr-xr-x    2         0 Feb 28 2015 Africa
/etc/zoneinfo #
/etc/zoneinfo #

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