A10E/A28E/A28F Configuration Guide
1.5.2 Configuring DST
Daylight Saving Time (DST) is a kind of artificial regulation local time system for saving
energy. At present, there are nearly 110 countries operating DST every summer around the
world, but different countries have different stipulations for DST. Thus, you should consider
the local conditions when configuring DST.
Configure DST for the A10E/A28E as below.
Alpha-A28E#clock summer-time enable
Use the clock summer-time
disable command to disable this
function.
Alpha-A28E#clock summer-time
recurring {
week
| last } { fri |
mon | sat | sun | thu | tue | wed }
month hour minute
{
week
| last }
{ fri | mon | sat |sun | thu | tue
| wed }
month hour minute offset-mm
Configure calculation period for
system DST.
When you set system time manually, if the system uses DST, such as DST from 2
a.m. on the second Sunday, April to 2 a.m. on the second Sunday, September
every year, you have to advance the clock one hour faster during this period, set
time offset as 60 minutes and from 2 a.m. to 3 a.m. on the second Sunday, April
each year is an inexistent time. The time setting by manual operation during this
period shows failure.
The summer time in southern hemisphere is opposite to northern hemisphere,
which is from September to April of next year. If user configures start time later
than ending time, system will suppose it is in the Southern Hemisphere. That is to
say, the summer time is the start time this year to the ending time of next year.
1.5.3 Configuring NTP
Network Time Protocol (NTP) is a time synchronization protocol defined by RFC1305, used
to synchronize time between distributed time servers and clients. NTP transportation is based
on UDP, using port 123.
The purpose of NTP is to synchronize all clocks in a network quickly and then the
A10E/A28E can provide different application over a unified time. Meanwhile, NTP can
ensure very high accuracy, with accuracy of 10ms around.
The A10E/A28E in support of NTP cannot only accept synchronization from other clock
source, but also to synchronize other devices as a clock source.
The A10E/A28E adopts multiple NTP working modes for time synchronization:
Server/Client mode
In this mode, client sends clock synchronization message to different servers. The server
works in server mode by automation after receiving synchronization message and send
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