H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 34)

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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 AP 2 has been synchronized to Switch B, and the clock stratum level of AP 2 is 3,
while that of Switch B is 2.
# Display NTP session information for AP 2, which shows that an association has been set up between
AP 2 and Switch B.
[AP2-Vlan-interface2] 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
Configuring NTP multicast mode
Network requirements
As shown in Figure 13 , Switch B functions as the NTP server for multiple devices on different network
segments and synchronizes the time among multiple devices. More specifically:
• Switch B's local clock is to be used as a reference source, with the stratum level 2.
• Switch B operates in multicast server mode and sends out multicast messages from VLAN-interface
2.
• AP 1 and AP 2 operate in multicast client mode and receive multicast messages through
VLAN-interface 3 and VLAN-interface 2, respectively.
Figure 13 Network diagram
Configuration procedure
1. Configure Switch B:
# Specify the local clock as the reference source, with the stratum level 2.
system-view
[SwitchB] ntp-service refclock-master 2