H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 501)

54-16
Clock offset: 0.0000 ms
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 AC A as the NTP server of AC B so that AC B is synchronized to AC A.
system-view
[AC B] ntp-service unicast-server 1.0.1.11
# View the NTP status of AC B after clock synchronization.
[AC B] display ntp-service status
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 1.0.1.11
Nominal frequency: 100.0000 Hz
Actual frequency: 100.0000 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 Apr 20 2007 (C6D94F67.5EF9DB22)
As shown above, AC B has been synchronized to AC A, and the clock stratum level of AC B is 3, while
that of AC A is 2.
# View the NTP session information of AC B, which shows that an association has been set up between
AC B and AC A.
[AC B] 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
z
The local clock of AC A is to be configured as a reference source, with the stratum level of 2.
z
AC B works in the client mode and AC A is to be used as the NTP server of AC B.
z
AC C works in the symmetric-active mode and AC B will act as peer of AC C. AC C is the
symmetric-active peer while AC B is the symmetric-passive peer.