White Papers

Version Description
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.6(0.0) Added support for VRF.
9.4.(0.0) Added support for VRF.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.11.1 Introduced on the Z9000.
8.4.1.0 Added IPv6 support.
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.
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.
1582 System Time and Date