3Com 5500-SI Configuration Manual page 503

c Enter Vlan-interface2 view.
[switch3]interface vlan-interface 2
d Set it as broadcast server.
[switch3-Vlan-Interface2]ntp-service broadcast-server
2 Configure Switch 4:
a Enter System View.
<switch4> system-view
b Enter Vlan-interface2 view.
[switch4]interface vlan-interface 2
[switch4-Vlan-Interface2]ntp-service broadcast-client
3 Configure Switch 1:
a Enter System View.
<switch1> system-view
b Enter Vlan-interface2 view.
[switch1]interface vlan-interface 2
[switch1-Vlan-Interface2]ntp-service broadcast-client
In the above examples Switch 4 and Switch 1 are configured to listen to the broadcast
using Vlan-interface2, Switch 3 to broadcast packets from Vlan-interface2. As Switch
1 and Switch 3 are not located on the same segment, they cannot receive any
broadcast packets from Switch 3, while Switch 4 is synchronized by Switch 3 after
receiving its broadcast packet.
After the synchronization, you can find the state of Switch 4 as follows:
[switch4]display ntp-service status
clock status: synchronized
clock stratum: 8
reference clock ID: LOCAL(0)
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 3 and it is at stratum 3, higher
than Switch 3 by 1.
Display the status of Switch 4 sessions and you will see Switch 4 has been connected
to Switch 3.
[switch2]display ntp-service sessions
source reference stra reach poll
********************************************************************
[12345]127.127.1.0 LOCAL(0) 7
[5]1.0.1.11
[5]128.108.22.44
note: 1 source(master),2 source(peer),3 selected,4 candidate,5
configured
377
0.0.0.0 16 0
0.0.0.0 16 0
Typical NTP Configuration Examples 503
now offset delay disper
64 57 0.0 0.0
64 - 0.0 0.0
64 - 0.0 0.0
1.0
0.0
0.0