H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 504)

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<AC C> system-view
[AC C] interface vlan-interface 2
[AC C-Vlan-interface2] ntp-service broadcast-client
3) Configuration on AC A:
# Configure AC A to work in the broadcast client mode and receive broadcast messages on
VLAN-interface 3.
<AC A> system-view
[AC A] interface vlan-interface 3
[AC A-Vlan-interface3] ntp-service broadcast-client
Because AC A and AC B are on different subnets, AC A cannot receive the broadcast messages from
AC B and AC C gets synchronized upon receiving a broadcast message from AC B.
# View the NTP status of AC C after clock synchronization.
[AC C-Vlan-interface2] display ntp-service status
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 3.0.1.31
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: 8.31 ms
Peer dispersion: 34.30 ms
Reference time: 16:01:51.713 UTC Apr 20 2007 (C6D95F6F.B6872B02)
As shown above, AC C has been synchronized to AC B, and the clock stratum level of AC C is 3, while
that of AC B is 2.
# View the NTP session information of AC C, which shows that an association has been set up between
AC C and AC B.
[AC C-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
z
AC C’s local clock is to be used as a reference source, with the stratum level of 2.
z
AC C works in the multicast server mode and sends out multicast messages from VLAN-interface
2.
z
AC D and AC A work in the multicast client mode. AC A receives multicast messages through
VLAN-interface 3, while AC D receives multicast messages through VLAN-interface 2.