Инструкции По Установке для 3com S7906E

 

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When NTP is enabled, NTP messages can be received from all the interfaces by default, and you can 

disable an interface from receiving NTP messages through the following configuration. 

Enter system view 

— 

Enter interface view 

interface interface-type 
interface-number 

— 

Disable the interface from 
receiving NTP messages  

ntp-service in-interface 
disable 

Required 

An interface is enabled to 
receive NTP messages by 
default. 

 

Enter system view 

— 

Configure the maximum 
number of dynamic sessions 
allowed to be established 
locally 

ntp-service 
max-dynamic-sessions 
number 

Required 

100 by default  

 

With the following command, you can configure the NTP service access-control right to the local device. 

There are four access-control rights, as follows: 

z 

query: control query permitted. This level of right permits the peer devices to perform control query 

to the NTP service on the local device but does not permit a peer device to synchronize its clock to 

that of the local device. The so-called “control query” refers to query of some states of the NTP 

service, including alarm information, authentication status, clock source information, and so on. 

z 

synchronization: server access only. This level of right permits a peer device to synchronize its 

clock to that of the local device but does not permit the peer devices to perform control query. 

z 

server: server access and query permitted. This level of right permits the peer devices to perform 

synchronization and control query to the local device but does not permit the local device to 

synchronize its clock to that of a peer device. 

z 

peer: full access. This level of right permits the peer devices to perform synchronization and control 

query to the local device and also permits the local device to synchronize its clock to that of a peer 

device. 

From the highest NTP service access-control right to the lowest one are peer,  server, 

synchronization, and query. When a device receives an NTP request, it will perform an 

access-control right match and will use the first matched right.