Administrator Guide

• 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.
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.
3. Dene a trusted key.
CONFIGURATION mode
ntp trusted-key number
Congure a number from 1 to 4294967295.
The number must be the same as the number used in the ntp authentication-key command.
4. Congure an NTP server.
CONFIGURATION mode
ntp server [vrf] <vrf-name> {hostname | ipv4-address |ipv6-address} [ key keyid]
[prefer] [version number]
Congure the IP address of a server and the following optional parameters:
• – vrf-name : Enter the name of the VRF through which the NTP server is reachable.
800
System Time and Date