H3C S7500E Series Operation Manual page 1110

Operation Manual – NTP
H3C S7500E Series Ethernet Switches
II. Network diagram
Vlan-int3
1.0.1.11/24
Switch A
Figure 1-10 Network diagram for NTP multicast mode configuration (on switches)
III. Configuration procedure
1) Configuration on Switch C:
# Specify the local clock as the reference source, with the stratum level of 2.
<SwitchC> system-view
[SwitchC] ntp-service refclock-master 2
# Configure Switch C to work in the multicast server mode and send multicast
messages through VLAN-interface 2.
[SwitchC] interface vlan-interface 2
[SwitchC-Vlan-interface2] ntp-service multicast-server
2) Configuration on Switch D:
# Configure Switch D to work in the multicast client mode and receive multicast
messages on VLAN-interface 2.
<SwitchD> system-view
[SwitchD] interface vlan-interface 2
[SwitchD-Vlan-interface2] ntp-service multicast-client
Because Switch D and Switch C are on the same subnet, Switch D can receive the
multicast messages from Switch C without being IGMP-enabled and can be
synchronized to Switch C.
# View the NTP status of Switch D after clock synchronization.
[SwitchD] display ntp-service status
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 3.0.1.31
Nominal frequency: 100.0000 Hz
Vlan-int3 Vlan-int2
1.0.1.10/24 3.0.1.30/24
Switch B
1-25
Chapter 1 NTP Configuration
Vlan-int2
3.0.1.31/24
Switch C
Vlan-int2
3.0.1.32/24
Switch D