3Com Switch 7750 Configuration Guide Guide
710 CHAPTER 66: NTP CONFIGURATION
# View the information about the NTP sessions of Switch 7750-1 and you can see
that a connection is established between Switch 7750-1 and Switch 7750-3.
[Switch 7750-1] display ntp-service sessions
source reference stra reach poll now offset delay disper
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[1]3.0.1.31 127.127.1.0 2 1 64 377 26.1 199.53 9.7
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
NTP Multicast Mode
Configuration
Network requirements
Switch 7750-3 sets the local clock to be NTP master clock, with the clock stratum
of 2. It advertises multicast packets through VLAN interface 2.
Configure Switch 7750-1 and Switch 7750-2 to listen to multicast 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 183 Network diagram for NTP multicast mode configuration
Configuration procedures
1 Configure Switch 7750-3.
# Enter system view.
<SW7750-3> system-view
[SW7750-3]
# Enter VLAN-interface 2 view.
[SW7750-3] interface Vlan-interface 2
# Configure Switch 7750-3 to be a multicast server.
[SW77503-Vlan-Interface2] ntp-service multicast-server
2 Configure Switch 7750-1.
# Enter system view.
<Switch 7750-1> system-view
[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