Administrator Guide

Usage Information
You can configure multiple time-serving hosts (up to 250). From these time-serving hosts, the system chooses
one NTP host with which to synchronize. To determine which server was selected, use the show ntp
associations command.
Because many polls to NTP hosts can impact network performance, Dell Networking recommends limiting the
number of hosts configured.
Related
Commands
show ntp associations — displays the NTP servers configured and their status.
ntp source
Specify an interface’s IP address to be included in the NTP packets.
C9000 Series
Syntax
ntp source interface
To delete the configuration, use the no ntp source command.
Parameters
interface Enter the following keywords and slot/port or number information:
• For Loopback interfaces, enter the keyword loopback then a number from zero (0)
to 16383.
• For a Port Channel interface, enter the keyword lag then a number. The range is
from 1 to 128.
• For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then
the slot/port information.
• For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the slot/
port information.
• For VLAN interface, enter the keyword vlan then a number from 1 to 4094.
• For a port extender (PE) Gigabit Ethernet interface, enter the keyword
peGigabitEthernet then the pe-id / stack-unit / port-id information. The pe-id
range is 0–255; the stack unit number range is 0–7; and the port-id range is 0 –47.
Defaults Not configured.
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.3.11.1 Introduced on the Z9000.
8.5.1.0 Added support for 4-port 40G line cards on ExaScale.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
6.1.1.0 Introduced on the E-Series.
1580 System Time and Date