Dell Command Line Reference Guide for the S4048–ON System


ntp server

Configure an NTP time-serving host.

ntp server[vrf vrf-name] {hostname | ipv4-address | ipv6-address} [key keyid] [prefer] [version number] [minpoll] [maxpoll]
vrf vrf-name
(Optional) Enter the keyword vrf and then the name of the VRF to configure an NTP time-serving host corresponding to that VRF.
ipv4-address | ipv6-address
Enter an IPv4 address (A.B.C.D) or IPv6 address (X:X:X:X::X) of NTP server.
Enter the host name of the server.
key keyid
(OPTIONAL) Enter the keyword key and a number as the NTP peer key. The range is from 1 to 65534.
(OPTIONAL) Enter the keyword prefer to indicate that this peer has priority over other servers.
version number
(OPTIONAL) Enter the keyword version and a number to correspond to the NTP version used on the server. The range is from 1 to 4.
minpoll polling-interval
(OPTIONAL) Enter the keyword minpollthen the polling-interval. The polling interval range is from 4 to 16.
maxpoll polling-interval
(OPTIONAL) Enter the keyword maxpollthen the polling-interval. The polling interval range is from 4 to 16.
Not configured.
Command Modes
Command History

This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC Networking OS Command Line Reference Guide.

The trusted-key range value is increased from 1 to 65534. Also, introduced the minpoll and maxpoll polling interval options.
Introduced on the S6010-ON and S4048T-ON.
Introduced on the S3148.
Introduced on the S6100–ON.
Introduced on the S3100 series.
Introduced on the Z9100–ON.
Introduced on the S4048-ON.
Introduced on the S3048-ON.
Introduced on the S6000-ON.
Added support for VRF.
Added support for VRF.
Introduced on the Z9500.
Introduced on the S6000.
Introduced on the Z9000.
Added IPv6 support.
Introduced on the S-Series.
Introduced on the C-Series.
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@ 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

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