H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 505)

54-20
Network diagram
Figure 54-10 Network diagram for NTP multicast mode configuration
Vlan-int3
1.0.1.11/24 Vlan-int3
1.0.1.10/24
Vlan-int2
3.0.1.31/24
Vlan-int2
3.0.1.32/24
Vlan-int2
3.0.1.30/24
AC A AC B
AC C
AC D
Configuration procedure
1) Configuration on AC C:
# Specify the local clock as the reference source, with the stratum level of 2.
system-view
[AC C] ntp-service refclock-master 2
# Configure AC C to work in the multicast server mode and send multicast messages through
VLAN-interface 2.
[AC C] interface vlan-interface 2
[AC C-Vlan-interface2] ntp-service multicast-server
2) Configuration on AC D:
# Configure AC D to work in the multicast client mode and receive multicast messages on
VLAN-interface 2.
system-view
[AC D] interface vlan-interface 2
[AC D-Vlan-interface2] ntp-service multicast-client
Because AC D and AC C are on the same subnet, AC D can receive the multicast messages from AC C
without being IGMP-enabled and can be synchronized to AC C.
# View the NTP status of AC D after clock synchronization.
[AC D-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)