Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 863
Configuring NTP Authentication
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CONFIGURATION mode ntp source 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 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 a port channel interface, enter the keywords port-channel then a number. • For a VLAN interface, enter the keyword vlan then a number from 1 to 4094. To view the configuration, use the show running-config ntp command in EXEC privilege mode (refer to the example in Configuring NTP Authentication). Configuring 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 first NTP packet is created following the configuration of keys. NTP authentication in 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. Dell Networking OS Behavior: Dell Networking OS uses an encryption algorithm to store the authentication key that is different from previous Dell Networking OS versions; Dell Networking OS uses data encryption standard (DES) encryption to store the key in the startupconfig when you enter the ntp authentication-key command. Therefore, if your system boots with a startup-configuration from an Dell Networking OS version in which you have configured ntp authentication-key, the system cannot correctly decrypt the key and cannot authenticate the NTP packets. In this case, re-enter this command and save the running-config to the startup-config. To configure 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 Configure 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 Define a trusted key. CONFIGURATION mode ntp trusted-key number Configure a number from 1 to 4294967295. The number must be the same as the number used in the ntp authentication-key command. 4 Configure an NTP server. CONFIGURATION mode ntp server [vrf] {hostname | ipv4-address |ipv6-address} [ key keyid] [prefer] [version number] Configure the IP address of a server and the following optional parameters: System Time and Date 863
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