7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
System management
Acronym Time zone name UTC offset
MDT Mountain Daylight Saving
Time
UTC -6
MT Mountain Time Either as MST or MDT, depending on place
and time of year
PST Pacific Standard Time UTC -8
PDT Pacific Daylight Saving Time UTC -7
PT Pacific Time Either as PST or PDT, depending on place
and time of year
HST Hawaiian Standard Time UTC -10
AKST Alaska Standard Time UTC -9
AKDT Alaska Standard Daylight
Saving Time
UTC -8
Australia
AWST Western Standard Time (for
example, Perth)
UTC +8
ACST Central Standard Time (for
example, Darwin)
UTC +9.5
AEST Eastern Standard/Summer
Time (for example,
Canberra)
UTC +10
6.1.2.2 Network Time Protocol
The Network Time Protocol (NTP) is defined in RFC 1305, Network Time Protocol (Version 3)
Specification, Implementation and Analysis. It allows participating network nodes to keep time more
accurately and maintain time in a more synchronized manner between the participating network nodes.
NTP uses stratum levels to define the number of hops from a reference clock. The reference clock is
treated as a stratum-0 device that is assumed to be accurate with little or no delay. Stratum-0 servers
cannot be used in a network. However, they can be directly connected to devices that operate as stratum-1
servers. A stratum-1 server is an NTP server with a directly-connected device that provides Coordinated
Universal Time (UTC), such as a GPS or atomic clock.
The 7210 SAS devices cannot act as stratum-1 servers but can act as stratum-2 devices because a
network connection to an NTP server is required.
The higher stratum levels are separated from the stratum-1 server over a network path, therefore a
stratum-2 server receives its time over a network link from a stratum-1 server. A stratum-3 server receives
its time over a network link from a stratum-2 server.
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