3Com Switch 8800 Configuration Guide Chapter 49 NTP Configuration
49-14
Configure Ethernet Switch SW88001:
Enter system view.
<SW88001> system-view
Enter Vlan-interface2 view.
[SW88001] interface vlan-interface 2
[SW88001-Vlan-Interface2] ntp-service broadcast-client
The above examples configured SW88004 and SW88001 to listen to the broadcast
through Vlan-interface2, SW88003 to broadcast packets from Vlan-interface2. Since
SW88001 and SW88003 are not located on the same segment, they cannot receive
any broadcast packets from SW88003, while SW88004 is synchronized by SW88003
after receiving its broadcast packet.
After the synchronization, you can find the state of SW88004 as follows:
[SW88004] display ntp-service status
clock status: synchronized
clock stratum: 3
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, SW88004 has been synchronized by SW88003 and it is at stratum 3,
higher than SW88003 by 1.
Display the status of SW88004 sessions and you will see SW88004 has been
connected to SW88003.
[SW88002] 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 LOCAL(0) 3 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
49.4.4 Configure NTP Multicast Mode I. Network requirements
SW88003 sets the local clock as the master clock at stratum 2 and multicast packets
from Vlan-interface2. Set SW88004 and SW88001 to receive multicast messages from