Deployment Guide

○ ipv6-address : Enter an IPv6 address in the format 0000:0000:0000:0000:0000:0000:0000:0000. Elision of zeros
is supported.
○ key keyid : Configure a text string as the key exchanged between the NTP server and the client.
○ prefer: Enter the keyword prefer to set this NTP server as the preferred server.
○ version number : Enter a number as the NTP version. The range is from 1 to 4.
○ minpoll polling-interval: Enter the minpoll value. The range is from 4 to 16.
○ maxpoll polling-interval: Enter the maxpoll value. The range is from 4 to 16.
5. Configure the switch as NTP master.
CONFIGURATION mode
ntp master <stratum>
To configure the switch as NTP Server use the ntp master<stratum> command. stratum number identifies the NTP
Server's hierarchy.
The following example shows configuring an NTP server.
Dell EMC(conf)#show running-config ntp
!
ntp master
ntp server 10.16.127.44
ntp server 10.16.127.86
ntp server 10.16.127.144
Dell EMC (conf)#
Dell EMC#show ntp associations
remote vrf-Id ref clock st when poll reach delay offset disp
====================================================================================
LOCAL(0) 0 .LOCL. 7 7 16 7 0.000 0.000 0.002
10.16.127.86 0 10.16.127.26 5 3 16 7 0.498 361.760 0.184
10.16.127.144 0 10.16.127.26 5 1 16 7 0.492 359.171 0.219
10.16.127.44 0 10.16.127.26 5 5 16 7 0.498 355.501 0.188
* master (synced), # backup, + selected, - outlier, x falseticker
Dell EMC#
In the above example, the LOCAL (0) determines the following:
● LOCAL(0) indicates that the local machine synchronizes with itself.
● .LOCL. indicates reference clock of the NTP master.
NOTE:
● Leap Indicator (sys.leap, peer.leap, pkt.leap) — This is a two-bit code warning of an impending leap second
to be inserted in the NTP time scale. The bits are set before 23:59 on the day of insertion and reset after 00:00 on the
following day. This causes the number of seconds (rollover interval) in the day of insertion to be increased or decreased
by one. In the case of primary servers, the bits are set by operator intervention, while in the case of secondary servers,
the bits are set by the protocol. The two bits, bit 0, and bit 1, respectively, are coded as follows:
● Poll Interval — integer indicating the minimum interval between transmitted messages, in seconds as a power of two.
For instance, a value of six indicates a minimum interval of 64 seconds.
● Precision — integer indicating the precision of the various clocks, in seconds to the nearest power of two. The value
must be rounded to the next larger power of two; for instance, a 50 Hz (20 ms) or 60 Hz (16.67ms) power-frequency
clock is assigned the value -5 (31.25 ms), while a 1000 Hz (1 ms) crystal-controlled clock is assigned the value -9 (1.95
ms).
● Root Delay (sys.rootdelay, peer.rootdelay, pkt.rootdelay) — a signed fixed-point number indicating the
total round-trip delay to the primary reference source at the root of the synchronization subnet, in seconds. This
variable can take on both positive and negative values, depending on clock precision and skew.
● Root Dispersion (sys.rootdispersion, peer.rootdispersion, pkt.rootdispersion) — a signed fixed-
point number indicating the maximum error relative to the primary reference source at the root of the synchronization
subnet, in seconds. Only positive values greater than zero are possible.
● Reference Clock Identifier (sys.refid, peer.refid, pkt.refid) — This is a 32-bit code identifying the
particular reference clock. In the case of stratum 0 (unspecified) or stratum 1 (primary reference source), this is
908
System Time and Date