H3C Technologies H3C SecBlade LB Cards - Manual (Page 142)

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Reference clock ID: 3.0.1.31
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: 8.31 ms
Peer dispersion: 34.30 ms
Reference time: 16:01:51.713 UTC Sep 19 2005 (C6D95F6F.B6872B02)
The output shows that LB A has synchronized to LB C. The stratum level of LB A is 3, and that of LB
C is 2.
# Display NTP session information for LB A, which shows that an association has been set up
between LB A and LB C.
[LBA-GigabitEthernet0/1] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[1234] 3.0.1.31 127.127.1.0 2 254 64 62 -16.0 32.0 16.6
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 1
NTP multicast mode configuration example
Network requirements
As shown in Figure 87 , LB B functions as the NTP server for multiple devices on different network segments
and synchronizes the time among multiple devices.
• LB B's local clock is to be used as a reference source, with the stratum level 2.
• LB B operates in multicast server mode and sends multicast messages from GigabitEthernet 0/1.
• LB A and LB C operate in multicast client mode and receive multicast messages through their
respective GigabitEthernet 0/1.
Figure 87 Network diagram