Operation Manual – NTP
H3C S5500-EI Series Ethernet Switches
Chapter 1 NTP Configuration
1-19
[SwitchB] 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, 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
1.8.2 Configuring the NTP Symmetric Mode
I. Network requirements
z
The local clock of Switch A is to be configured as a reference source, with the
stratum level of 2.
z
Switch B works in the client mode and Switch A is to be used as the NTP server of
Switch B.
z
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.
