Configuring The Ntp Symmetric Mode - HP 4800G Series Configuration Manual

# View the NTP session information of Switch B, which shows that an association has been set up
between Switch B and Switch A.
[SwitchB] display ntp-service sessions
source
**************************************************************************
[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 Switch A is to be used as the master clock, with a stratum level of 2.
Switch B works in the client mode and Switch A is to be used as the NTP server of Switch B.
Switch C works in the symmetric-active mode and Switch B will act as peer of Switch C. Switch C is
the symmetric-active peer while Switch B is the symmetric-passive peer.
Figure 1-8 Network diagram for NTP symmetric peers mode configuration
3.0.1.32/24
Switch B
Configuration procedure
1) Configuration on Switch B:
# Specify Switch A as the NTP server of Switch B.
<SwitchB> system-view
[SwitchB] ntp-service unicast-server 3.0.1.31
2) Configuration on Switch C (after Switch B is synchronized to Switch A):
# Specify the local clock as the reference source, with the stratum level of 1.
<SwitchC> system-view
[SwitchC] ntp-service refclock-master 1
# Configure Switch B as a symmetric peer after local synchronization.
[SwitchC] ntp-service unicast-peer 3.0.1.32
In the step above, Switch B and Switch C are configured as symmetric peers, with Switch C in the
symmetric-active mode and Switch B in the symmetric-passive mode. Because the stratus level of
Switch C is 1 while that of Switch B is 3, Switch B is synchronized to Switch C.
# View the NTP status of Switch B after clock synchronization.
reference stra reach
127.127.1.0 2
1
Switch A
3.0.1.31/24
3.0.1.33/24
Switch C
poll now offset
63 64 3 -75.5
1-16
delay disper
31.0 16.5