Configure Simple Network Time Protocol (SNTP) Authentication Settings on a Switch through the Command Line Interface (CLI)

Available Languages

Download Options

PDF (457.5 KB)
View with Adobe Reader on a variety of devices
ePub (53.7 KB)
View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone
Mobi (Kindle) (74.4 KB)
View on Kindle device or Kindle app on multiple devices

Updated:December 13, 2018

Document ID:SMB5823

Bias-Free Language

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

Configure Simple Network Time Protocol (SNTP) Authentication Settings on a Switch through the Command Line Interface (CLI)

Objective

Simple Network Time Protocol (SNTP) is the simplified version of Network Time Protocol (NTP). NTP is the protocol that is used to synchronize the clock on a network. It provides time within 100 milliseconds of the accurate time, but does not authenticate traffic.

The SNTP authentication page of the switch allows the administrator to configure NTP authentication keys to verify a time source. SNTP authentication should be used only in situations where strong authentication is not required as it does not provide the complex filtering mechanisms of NTP.

This document explains how to define SNTP Authentication through the Command Line Interface (CLI) of a switch. You may also configure SNTP authentication settings through the web-based utility of the switch. For instructions, click here.

Applicable Devices

Sx300 Series
Sx350 Series
SG350X Series
Sx500 Series
Sx550X Series

Software Version

1.4.7.05 - Sx300, Sx500
2.2.8.04 - Sx350, SG350X, Sx550X

Configure SNMP Groups on a Switch

Step 1. Access the CLI of the switch.

Note: In this example, PuTTY is the application used to access the switch CLI. The default username and password is cisco/cisco. If you have customized your credentials, use your username and password.

Step 2. Switch to Global Configuration mode by entering the following command:

SG350X#configureterminal

Step 3. Define an SNTP Authentication Key using one of the following syntax:

SG350X(config)#sntp authentication-key [key-number] md5 [key-value]

SG350X(config)#encrypted sntp authentication-key [key-number] md5 [encrypted key-value]

Where:

key-number - This specifies the number of the key. It can be from 1 to 4294967295.
key-value - This specifies the value of the key. It can be from one to eight characters long.
Encrypted-key-value - This specifies the key value in encrypted format.

SG350X(config)#sntp authentication-key 121110 md5 cisco

Note: In this example, sntp authentication-key 121110 md5 cisco is entered.

Step 4. Switch to Global Configuration mode by entering the following command:

SG350X(config)#exit

Step 5. (Optional) Enter the following command in Privileged EXEC mode to save the configuration.

SG350X#copy running-config startup-config

Step 6. (Optional) Press Y to save the settings in the startup configuration of the switch otherwise, press N to proceed without saving the configuration to the startup configuration of the switch.