Configuring The Ntp Symmetric Mode - 3Com S7906E Configuration Manual

[DeviceB] display ntp-service sessions
source
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[12345] 1.0.1.11
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations :

Configuring the NTP Symmetric Mode

Network requirements
The local clock of Device A is to be configured as a reference source, with the stratum level of 2.
Device B works in the client mode and Device A is to be used as the NTP server of Device B.
Device C works in the symmetric-active mode and Device B will act as peer of Device C. Device C
is the symmetric-active peer while Device B is the symmetric-passive peer.
Figure 1-8 Network diagram for NTP symmetric peers mode configuration
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Switch B
Configuration procedure
1) Configuration on Device A:
# Specify the local clock as the reference source, with the stratum level of 2.
<DeviceA> system-view
[DeviceA] ntp-service refclock-master 2
2) Configuration on Device B:
# Specify Device A as the NTP server of Device B.
<DeviceB> system-view
[DeviceB] ntp-service unicast-server 3.0.1.31
3) Configuration on Device C (after Device B is synchronized to Device A):
# Specify the local clock as the reference source, with the stratum level of 1.
<DeviceC> system-view
[DeviceC] ntp-service refclock-master 1
# Configure Device B as a symmetric peer after local synchronization.
[DeviceC] ntp-service unicast-peer 3.0.1.32
reference stra reach
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1
Switch A
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Switch C
poll now offset
64 3 -75.5
1-18
delay disper
31.0 16.5