3Com Switch 8800 Advanced Software V5 Configuration Guide

NTP Configuration Examples 1081
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[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
Switch C’s local clock is to be used as a reference source, with the stratum level of
2, and Switch C sends out multicast messages from VLAN-interface 2. Switch D
and Switch A listen to multicast messages through VLAN-interface 2 and
VLAN-interface 3 respectively.
Network diagram
Figure 317 Network diagram for NTP multicast mode configuration
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.
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
Switch A Switch B
Switch C
Switch D