H3C Technologies H3C SecBlade LB Cards - Manual (Page 139)

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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)
The output shows that Device B has synchronized to Device A. The stratum level of Device B is 3,
and that of Device A is 2.
# Display NTP session information for Device B, which shows that an association has been set up
between Device B and Device A.
[DeviceB] 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
NTP symmetric peers mode configuration example
Network requirements
Perform the following configurations to synchronize time among devices:
• As shown in Figure 85 , the local clock of LB A is to be configured as a reference source, with the
stratum level 2.
• The local clock LB C is to be configured as a reference source, with the stratum level 1.
• LB B operates in client mode and LB A is to be used as the NTP server of LB B.
• LB C operates in symmetric-active mode and LB B acts as the peer of LB C.
Figure 85 Network diagram
Configuration procedure
• Set the IP address for each interface as shown in Figure 85 . (Details not shown.)
• Configure LB A:
# Specify the local clock as the reference source, with the stratum level 2.
LB A
NTP server
LB B
NTP client/
symmetric passive peer
LB C
Symmetric active peer
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