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Usage guidelines
You need to enable SNTP authentication in networks that require time synchronization security to make
sure SNTP clients are synchronized only to authenticated NTP servers.
To authenticate an NTP server, set an authentication key and specify it as a trusted key.
Examples
# Enable SNTP authentication.
<Sysname> system-view
[Sysname] sntp authentication enable
Related commands
• sntp authentication-keyid
• sntp reliable authentication-keyid
sntp authentication-keyid
Use sntp authentication-keyid to set an SNTP authentication key.
Use undo sntp authentication-keyid to remove the SNTP authentication key.
Syntax
sntp authentication-keyid keyid authentication-mode md5 { cipher | simple } value
undo sntp authentication-keyid keyid
Default
No SNTP authentication key is set.
Views
System view
Predefined user roles
network-admin
Parameters
keyid: Specifies a key ID to identify an authentication key, in the range of 1 to 4294967295.
authentication-mode md5 value: Uses the MD5 algorithm for key authentication.
simple: Sets a plaintext authentication key.
cipher: Sets a ciphertext authentication key.
value: Specifies the MD5 authentication key string. If simple is specified, it is a string of 1 to 32
characters. If cipher is specified, it is a string of 1 to 73 characters.
Usage guidelines
You need to enable SNTP authentication in networks that require time synchronization security to make
sure SNTP clients are synchronized only to authenticated NTP servers.
Configure the same key ID and key value on the SNTP client and NTP server. Otherwise, the SNTP client
cannot be synchronized to the NTP server.
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