H3C S5120-EI Series, Руководство по эксплуатации

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1-17
Root delay: 0.00 ms
Root dispersion: 0.00 ms
Peer dispersion: 0.00 ms
Reference time: 00:00:00.000 UTC Jan 1 1900 (00000000.00000000)
# Specify Switch A as the NTP server of Switch B so that Switch B is synchronized to Switch A.
<SwitchB> system-view
[SwitchB] ntp-service unicast-server 1.0.1.11
# View the NTP status of Switch B after clock synchronization.
[SwitchB] 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 2005 (C6D94F67.5EF9DB22)
As shown above, Switch B has been synchronized to Switch A, and the clock stratum level of Switch B
is 3, while that of Switch A is 2.
# 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 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
Configuring the NTP Symmetric Mode
Network requirements
Perform the following configurations to synchronize time among devices:
z
The local clock of Device A is to be configured as a reference source, with the stratum level of 2.
z
Device B works in the client mode and Device A is to be used as the NTP server of Device B.
z
After Device B is synchronized to Device A , 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.