Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 6 NTP Configuration Commands
3Com Corporation
6-5
Example
<3com> display ntp-service trace
server4: stratum 4, offset 0.0019529, synch distance 0.144135
server3: stratum 3, offset 0.0124263, synch distance 0.115784
server2: stratum 2, offset 0.0019298, synch distance 0.011993
server1: stratum 1, offset 0.0019298, synch distance 0.011993 refid 'GPS
Reciever'
The output displays the synchronization path from server 4 to its reference clock source,
where server 4 synchronizes to server 3, server 3 to server 2, server 2 to server 1, and
server 1 to the reference clock source GPS Receiver.
6.1.5 ntp-service access
Syntax
ntp-service access { query | synchronization | server | peer } acl-number
undo ntp-service access { query | synchronization | server | peer }
View
System view
Parameter
query: Query right.
synchronization: access to the server is permitted.
server: Both access to the server and query are allowed.
peer: Full access right.
acl-number: IP ACL number in the range 2000 to 2999.
Description
Use the ntp-service access command to control access to the NTP service on the
local device.
Use the undo ntp-service access command to cancel the limit on the access right.
By default, no access right is configured.
You can control access to the NTP service on the local device with this command. Each
time the system receives a request, it compares the request against the access control
restrictions from least to maximum: peer, server, synchronization, query.
For protection more secure, you need to configure identification authentication.