Administrator Guide

Version Description
6.1.1.0 Introduced on the E-Series.
Usage
Information
You can configure multiple time-serving hosts. From these time-serving hosts, the Dell EMC Networking
OS chooses one NTP host with which to synchronize. To determine which server is selected, use the
show ntp associations command.
Because many polls to NTP hosts can affect network performance, Dell EMC Networking recommends
limiting the number of hosts configured.
By default, the system performs a time synchronization if the time difference from the time source is
greater than one second.
When the Dell EMC Networking OS NTP client receives inconsistent timestamp in the origin timestamp
filed, it logs the syslog message. It is due to the older versions of NTPD server implementation. Upgrade
the system to the latest NTPD package in the NTP server and the system logs the following NTP syslog
message:
Dell EMC# May 30 13:27:46 %STKUNIT2-:CP %ntp-6-: receive: Unexpected
origin timestamp 0xdeb95bee.06ba346e does not match aorg
0000000000.00000000 from server@10.16.151.117 xmt 0xdeb95bee.30907a87
In general, the packet denied services are dropped with no further action except incrementing the
statistics counters. In certain cases, a more proactive response is required to cause the client to slow
down the process. A special packet is created to serve this purpose, and it is called the kiss-o-Death
(KoD) packet. When the Dell EMC Networking OS client receives KoD packets, it logs the following syslog
message:
Dell EMC# May 27 14:32:13 %STKUNIT1-:CP %ntp-6-: receive: KoD packet
from 300::2 has inconsistent xmt/org/rec timestamps. Ignoring.
Related
Commands
● show ntp associations—displays the NTP servers that are configured and their status.
ntp source
Specify an interface’s IP address to be included in the NTP packets.
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 a 10-Gigabit Ethernet interface, enter the keyword
TenGigabitEthernet then the slot/port/subport[/subport] information.
● For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the
slot/port information.
● For a Loopback interface, enter the keyword loopback then a number from 0
to 16383.
● For the Management interface, enter the keyword ManagementEthernet
then slot/port information.
● For a port-channel interface, enter the keywords port-channel then the
port-channel ID.
● For VLAN interface, enter the keyword vlan then a number from 1 to 4094.
Defaults Not configured.
Command Modes CONFIGURATION
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
System Time and Date 1667