Concept Guide

Enabling NTP
NTP is disabled by default.
To enable NTP, specify an NTP server to which the Dell Networking system synchronizes. To specify multiple servers, enter the command
multiple times. You may specify an unlimited number of servers at the expense of CPU resources.
• Specify the NTP server to which the Dell Networking system synchronizes.
CONFIGURATION mode
ntp server ip-address
Viewing System Clock State Relative to NTP
Example of Viewing Calculated NTP Synchronization Variables
To display the system clock state with respect to NTP, use the show ntp status command from EXEC Privilege mode.
Dell(conf)#do show ntp status
Clock is synchronized, stratum 2, reference is 192.168.1.1
frequency is -369.623 ppm, stability is 53.319 ppm, precision is 4294967279
reference time is CD63BCC2.0CBBD000 (16:54:26.049 UTC Thu Mar 12 2012)
clock offset is 997.529984 msec, root delay is 0.00098 sec
root dispersion is 10.04271 sec, peer dispersion is 10032.715 msec
peer mode is client
To display the calculated NTP synchronization variables received from the server that the system uses to synchronize its clock, use the
show ntp associations command from EXEC Privilege mode.
Dell(conf)#do show ntp associations
remote ref clock st when poll reach delay offset disp
==========================================================
#192.168.1.1 .LOCL. 1 16 16 76 0.98 -2.470 879.23
* master (synced), # master (unsynced), + selected, - candidate
Conguring NTP Broadcasts
With the Dell Networking OS, you can receive broadcasts of time information.
You can set interfaces within the system to receive NTP information through broadcast.
To congure an interface to receive NTP broadcasts, use the following commands.
• Set the interface to receive NTP packets.
INTERFACE mode
ntp broadcast client
Example of Conguring NTP Broadcasts
2w1d11h : NTP: Maximum Slew:-0.000470, Remainder = -0.496884
Disabling NTP on an Interface
By default, NTP is enabled on all active interfaces. If you disable NTP on an interface, the system drops any NTP packets sent to that
interface.
To disable NTP on an interface, use the following command.
• Disable NTP on the interface.
INTERFACE mode
862
System Time and Date