Defining Sntp Authentication - Cisco Small Business 200 Series Administration Manual

Administration: Time Settings
Configuring System Time

Defining SNTP Authentication

SNTP clients can authenticate responses by using HMAC-MD5. An SNTP server is associated with a key,
which is used as input together with the response itself to the MD5 function; the result of the MD5 is also
included in the response packet.
The SNTP Authentication page enables configuration of the authentication keys that are used when
communicating with an SNTP server that requires authentication.
The authentication key is created on the SNTP server in a separate process that depends on the type of
SNTP server you are using. Consult with the SNTP server system administrator for more information.
Workflow
STEP 1
STEP 2
STEP 3
To enable SNTP authentication and define keys:
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
• Authentication Key ID—Enter the number used to identify this SNTP authentication key internally.
• Authentication Key—Enter the key used for authentication (up to eight characters). The SNTP server
must send this key for the device to synchronize to it.
• Trusted Key—Select to enable the device to receive synchronization information only from a SNTP
server by using this authentication key.
STEP 6
STEP 7
Cisco Small Business 200 Series Smart Switch Administration Guide
Enable authentication in the SNTP Authentication page.
Create a key in the SNTP Authentication page.
Associate this key with an SNTP server in the SNTP Unicast page.
Click Administration > Time Settings > SNTP Authentication.
Select SNTP Authentication to support authentication of an SNTP session
between the device and an SNTP server.
Click Apply to update the device.
Click Add.
Enter the following parameters:
Click Apply. The SNTP Authentication parameters are written to the Running
Configuration file.
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