3Com Switch 4200G Configuration Guide

Configuration Example 305
Root delay: 27.47 ms
Root dispersion: 208.39 ms
Peer dispersion: 9.63 ms
Reference time: 17:03:32.022 UTC Thu Sep 6 2001 (BF422AE4.05AEA86C)
The output information indicates that S4200G 1 is synchronized to S4200G 3, with
the clock stratum of 3, one stratum higher than S4200G 3.
d Display the information about the NTP sessions of S4200G and you can see that a
connection is established between S4200G and S4200G3.
[S4200G] display ntp-service sessions
source refid st now poll reach delay offset dis
********************************************************************
[1]3.0.1.31 0.0.0.0 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
S4200G3 sets the local clock to be NTP master clock, with the clock stratum of 2. It
advertises multicast packets through VLAN interface 2.
Configure S4200G 1 to listen multicast packets through their VLAN interface 2.
This example assumes that S4200G 3 is a switch that supports the local clock being
the master clock.
Network diagram
Figure 97 Network diagram for NTP multicast mode configuration
Configuration procedures
1 Configure S4200G 3.
a Enter system view.
<S4200G> system-view
System View: return to User View with Ctrl+Z.
[S4200G]
b Enter VLAN interface 2 view.
[S4200G] interface vlan-interface 2
c Configure S4200G 3 to be a multicast server.
[S4200G-Vlan-Interface2] ntp-service multicast-server