Users Guide

INTERFACE mode
ntp disable
To view whether NTP is congured on the interface, use the show config command in INTERFACE mode. If ntp disable is not
listed in the show config command output, NTP is enabled. (The show config command displays only non-default conguration
information.)
Conguring a Source IP Address for NTP Packets
By default, the source address of NTP packets is the IP address of the interface used to reach the network.
You can congure one interface’s IP address include in all NTP packets.
To congure an IP address as the source address of NTP packets, use the following command.
• Congure a source IP address for NTP packets.
CONFIGURATION mode
ntp source interface
Enter the following keywords and slot/port or number information:
– For a Loopback interface, enter the keyword loopback then a number between 0 and 16383.
– For a port channel interface, enter the keyword port-channel then a number from 1 to 128.
– For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port information.
– For a VLAN interface, enter the keyword vlan then a number from 1 to 4094.
– For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the slot/port information.
– For the Management interface, enter the keyword ManagementEthernet then the slot/port information.
To view the conguration, use the show running-config ntp command in EXEC privilege mode (refer to the example in Conguring
NTP Authentication).
Conguring NTP Authentication
NTP authentication and the corresponding trusted key provide a reliable means of exchanging NTP packets with trusted time sources.
NTP authentication begins when the rst NTP packet is created following the conguration of keys. NTP authentication in the Dell
Networking OS uses the message digest 5 (MD5) algorithm and the key is embedded in the synchronization packet that is sent to an NTP
time source.
To congure NTP authentication, use the following commands.
1 Enable NTP authentication.
CONFIGURATION mode
ntp authenticate
2 Set an authentication key.
CONFIGURATION mode
ntp authentication-key number md5 key
Congure the following parameters:
• number: the range is from 1 to 4294967295. This number must be the same as the number in the ntp trusted-key
command.
• key: enter a text string. This text string is encrypted.
System Time and Date
843