Configuring Ntp Broadcast Mode - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide

8.4.3 Configuring NTP Broadcast Mode

I. Network requirements
3Com3 sets the local clock as the NTP master clock and the stratum number is 2. It
transmits broadcast packets from Ethernet 1/0/0. 3Com4 and 3Com1 are set to listen to
the broadcast message from their interfaces respectively.
II. Network diagram
See Figure 8-2.
III. Configuration procedure
1) Configure 3Com3
# Enter the system view.
<3Com3> system-view
# Set the local clock as the NTP master clock and the stratum number is 2.
[3Com3] ntp-service refclock-master 2
# Enter the interface Ethernet 1/0/0 view.
[3Com3] interface ethernet 1/0/0
# Set the broadcast server.
[3Com3-Ethernet1/0/0] ntp-service broadcast-server
2) Configure 3Com4
# Enter the system view.
<3Com4> system-view
# Enter the interface Ethernet 1/0/0 view.
[3Com4] interface ethernet 1/0/0
[3Com4-Ethernet1/0/0] ntp-service broadcast-client
3) Configure 3Com1
# Enter the system view.
<3Com1> system-view
# Enter the interface Ethernet 1/0/0 view.
[3Com1] interface ethernet 1/0/0
[3Com1-Ethernet1/0/0] ntp-service broadcast-client
In the above configuration, 3Com4 and 3Com1 are configured to listen to broadcast
messages from Ethernet 1/0/0 and 3Com3 is configured to transmit broadcast packets
from Ethernet 1/0/0. Because 3Com1 and 3Com3 are on different network segment,
3Com1 cannot receive the broadcast packets transmitted by 3Com3. 3Com4 is
synchronized with 3Com3 after receiving the broadcast packets transmitted by 3Com3.
The state of 3Com4 after synchronization includes:
3Com Corporation
8-15
Chapter 8 NTP Configuration