3com 5500-ei pwr Guia De Referência

 

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NTP service access-control rights from the highest to the lowest are peer, server, synchronization, 

and query. When a local NTP server receives an NTP request, it will perform an access-control right 

match and will use the first matched right. 

The ntp-service access command only provides a minimal degree of security measure. A more secure 

way is to perform identity authentication.  

Refer to the ntp-service authentication enable command for related configuration. 

# Configure the access right from the remote device in ACL 2076 to the local NTP server as peer. 

<Sysname> system-view 

System View: return to User View with Ctrl+Z.  

[Sysname] ntp-service access peer 2076 

# Configure the access right from the remote device in ACL 2028 to the local NTP server as server. 

<Sysname> system-view 

System View: return to User View with Ctrl+Z.  

[Sysname] ntp-service access server 2028 

System view 

None 

Use the ntp-service authentication enable command to enable the NTP authentication. 

Use the undo ntp-service authentication enable command to disable the NTP authentication. 

By default, the NTP authentication is disabled. 

Refer to the ntp-service reliable authentication-keyid and ntp-service authentication-keyid 

commands for related configuration. 

# Enable the NTP authentication. 

<Sysname> system-view 

System View: return to User View with Ctrl+Z.  

[Sysname] ntp-service authentication enable