Network requirements – H3C Technologies H3C WX5500E Series Access Controllers User Manual
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# Specify the key as a trusted key.
[DeviceA] ntp-service reliable authentication-keyid 42
# Display the NTP status of Device B after clock synchronization.
[DeviceB] display ntp-service status
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 1.0.1.11
Nominal frequency: 64.0000 Hz
Actual frequency: 64.0000 Hz
Clock precision: 2^7
Clock offset: 0.0000 ms
Root delay: 31.00 ms
Root dispersion: 1.05 ms
Peer dispersion: 7.81 ms
Reference time: 14:53:27.371 UTC Sep 19 2012 (C6D94F67.5EF9DB22)
The output shows that Device B has synchronized to Device A. The stratum level of Device B is 3,
and that of Device A is 2.
# Display NTP session information for Device B, which shows that an association has been set up
between Device B and Device A.
[DeviceB] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[12345] 1.0.1.11 127.127.1.0 2 63 64 3 -75.5 31.0 16.5
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 1
Configuration example for NTP broadcast mode with
authentication
Network requirements
As shown in
, Switch C functions as the NTP server for multiple devices on different network
segments and synchronizes the time among multiple devices. Switch B authenticates the reference source.
•
Switch C’s local clock is to be used as a reference source, with the stratum level 3.
•
Switch C operates in broadcast server mode and sends out broadcast messages from
VLAN-interface 2.
•
Switch A and Switch B operate in broadcast client mode and receive broadcast messages through
VLAN-interface 2.
•
NTP authentication is enabled on both Switch B and Switch C.