3com 4500 50-PORT User Manual

: Allows time request and query on the local NTP server. The local clock 

cannot be synchronized to the remote server.

: Allows only time request on the local NTP server.

query: Allows only query on the local NTP server.

acl-number

: Basic access control list (ACL) number, in the range of 2000 to 2999.

Use the 

 command to set the access control right to the local 

NTP server.

Use the 

 command to remove the configured access 

control right to the local NTP server.

By default, the access control right to the local NTP server is peer.

The 

ntp-service access

 command only provides a minimal degree of security 

measure. A more secure way is to perform identity authentication. 

The right of a received access request is matched from the highest to the lowest in 
order of peer, server, synchronization, and query.

Configure the peer in ACL 2076 to have the full access right to the local NTP 
server, including time request, query control, and time synchronization.

<SW4500> system-view

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

[SW4500] ntp-service access peer 2076

Configure the peer in ACL 2028 to have the right to access and query the local 
NTP server.

<SW4500> system-view

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

[SW4500] ntp-service access server 2028

System view

None