3Com 4210 PWR Configuration Manual page 387

Configuring NTP
Server/Client Mode with
Authentication
Root dispersion: 208.39 ms
Peer dispersion: 9.63 ms
Reference time: 17:03:32.022 UTC Thu Apr 2 2007 (BF422AE4.05AEA86C)
The output information indicates that Device D is synchronized to Device C, with a
clock stratum level of 3, one stratum level lower than that Device C.
# View the information about the NTP sessions of Device D (You can see that a
connection is established between Device D and Device C).
[DeviceD] display ntp-service sessions
source reference
**************************************************************************
[1234]3.0.1.31
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured To
tal associations :
Network requirements
The local clock of Device A is set as the NTP master clock, with a clock stratum
■
level of 2.
Device B is a Switch 4210 and uses Device A as the NTP server. Device B is set to
■
work in client mode, while Device A works in server mode automatically.
The NTP authentication function is enabled on Device A and Device B.
■
Network diagram
Figure 118 Network diagram for NTP server/client mode with authentication
configuration
1.0.1.11/24
Device A
Configuration procedure
1 Configure Device B.
# Enter system view.
<DeviceB> system-view
# Enable the NTP authentication function.
[DeviceB] ntp-service authentication enable
# Configure an MD5 authentication key, with the key ID being 42 and the key
being aNiceKey.
[DeviceB] ntp-service authentication-keyid 42 authentication-mode md5 aNiceKey
# Specify the key 42 as a trusted key.
[DeviceB] ntp-service reliable authentication-keyid 42
# Associate the trusted key with the NTP server (Device A).
[DeviceB] ntp-service unicast-server 1.0.1.11 authentication-keyid 42
After the above configurations, Device B is ready to synchronize with Device A.
Because the NTP authentication function is not enabled on Device A, the clock of
Device B will fail to be synchronized to that of Device A.
stra reach poll
127.127.1.0 2
1
1 .0.1.12/24
Device B
Configuration Example
now offset delay disper
1 64 377 26.1
385
199.53 9.7