3Com Switch 7750 Configuration Guide Guide
708 CHAPTER 66: NTP CONFIGURATION
The output information indicates that Switch 7750 is synchronized to Switch 7750
3 and the stratum of its local clock is 2, one stratum higher than Switch 7750 3.
# View the information about the NTP sessions of Switch 7750 and you can see
that a connection is established between Switch 7750 and Switch 7750 3.
[Switch 7750 Family] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[2]3.0.1.32 127.127.1.0 1 1 64 1 350.1 15.1 0.0
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
NTP Broadcast Mode
Configuration
Network requirements
Switch 7750 3 sets its local clock to be an NTP master clock, with the stratum
being 2. NTP packets are broadcast through VLAN interface 2.
Configure Switch 7750-1 and Switch 7750-2 to listen to broadcast packets
through their VLAN interface 2.
n
This example assumes that Switch 7750 3 is a switch that supports the local clock
being the master clock.
Network diagram
Figure 182 Network diagram for the NTP broadcast mode configuration
Configuration procedures
1 Configure Switch 7750-3.
# Enter system view.
<SW77503> system-view
[SW77503]
# Enter VLAN-interface 2 view.
[SW77503] interface Vlan-interface 2
[SW77503-Vlan-Interface2]
# Configure Switch 7750-3 to be the broadcast server and send broadcast packets
through VLAN-interface 2.
[SW77503-Vlan-Interface2] ntp-service broadcast-server
2 Configure Switch 7750-1.
Switch 7750-3
Switch 7750-4
3.0.1.31/24
3.0.1.32/24
1.0.1.31/24
Vlan - interface 2
Vlan - interface 2
Vlan - interface 2
3.0.1.31/24
3.0.1.32/24
1.0.1.31/24
Vlan - interface 2
Vlan - interface 2
Vlan - interface 2
3.0.1.31/24
3.0.1.32/24
1.0.1.31/24
Vlan - interface 2
Vlan - interface 2
Vlan - interface 2
3.0.1.31/24
3.0.1.32/24
1.0.1.31/24
Vlan - interface 2
Vlan - interface 2
Vlan - interface 2
Switch 7750-2
3.0.1.31/24
3.0.1.32/24
1.0.1.31/24
Vlan - interface 2
Vlan - interface 2
Vlan - interface 2
3.0.1.31/24
3.0.1.32/24
1.0.1.31/24
Vlan - interface 2
Vlan - interface 2
Vlan - interface 2
3.0.1.31/24
3.0.1.32/24
1.0.1.31/24
Vlan - interface 2
Vlan - interface 2
Vlan - interface 2
3.0.1.31/24
3.0.1.32/24
1.0.1.31/24
Vlan - interface 2
Vlan - interface 2
Vlan - interface 2
Switch 7750-1