3Com 5500-SI - Configure NTP Broadcast Mode

502 CHAPTER 22: FILE SYSTEM MANAGEMENT
3 Configure Switch 5: (Switch 4 has been synchronized by Switch 3)
a Enter System View.
<switch5> system-view
b After performing local synchronization, set Switch 4 as a peer.
[switch5]ntp-service unicast-peer 3.0.1.32
The above examples configure Switch 4 and Switch 5 as peers and configures Switch
5 in active peer mode and Switch 4 in passive peer mode. Since Switch 5 is at stratum
1 and Switch 4 is at stratum 3, synchronize Switch 4 by Switch 5.
After synchronization, Switch 4 status is shown as follows:
[switch4]display ntp-service status
clock status: synchronized
clock stratum: 8
reference clock ID: 3.0.1.31
nominal frequency: 100.0000 Hz
actual frequency: 100.0000 Hz
clock precision: 2^17
clock offset: 0.0000 ms
root delay: 0.00 ms
root dispersion: 10.94 ms
peer dispersion: 10.00 ms
reference time: 20:54:25.156 UTC Mar 7 2002(C0325201.2811A112)
By this time, Switch 4 has been synchronized by Switch 5 and it is at stratum 2, or
higher than Switch 5 by 1.
Display the sessions of Switch 4 and you will see Switch 4 has been connected with
Switch 5.
[switch4]display ntp-service sessions
source reference stra reach poll now offset delay disper
*******************************************************************
[12345]127.127.1.0 LOCAL(0) 7 377 64 57 0.0 0.0 1.0
[5]1.0.1.11 0.0.0.0 16 0 64 - 0.0 0.0 0.0
[5]128.108.22.44 0.0.0.0 16 0 64 - 0.0 0.0 0.0
note: 1 source(master),2 source(peer),3 selected,4 candidate,5
configured
Configure NTP Broadcast
Mode
Network Requirements
On Switch 3, set local clock as the NTP master clock at stratum 2 and configure to
broadcast packets from Vlan-interface2. Configure Switch 4 and Switch 1 to listen to
the broadcast from their Vlan-interface2 respectively. (Note that Switch 3 must
support setting local clock as the NTP master clock.)
Networking Diagram
See Figure 132.
Configuration Procedure
1 Configure Switch 3:
a Enter System View.
<switch3> system-view
b Set the local clock as the NTP master clock at stratum 2.
[switch3]ntp-service refclock-master 2