3Com 4200G 12-Port Configuration Manual page 320

306 C 35: NTP C
HAPTER ONFIGURATION
2 Configure S4200G 1.
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 4 to be a multicast client.
[S4200G-Vlan-interface2] ntp-service multicast-client
3 Configure S4200G.2
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 1 to be a multicast client.
[S4200G-Vlan-interface2] ntp-service multicast-client
The above configuration configures S4200G 1 to listen multicast packets through
their VLAN interface 2, and S4200G 3 to advertise multicast packets through VLAN
interface 2. Because S4200G 2 does not resides in the same network segment as
S4200G 3 does, the former cannot receive multicast packets sent by S4200G 3, while
S4200G 1 is synchronized to S4200G 3 after receiving multicast packets sent by
S4200G 3.
Display the status of S4200G 1 after the synchronization.
[S4200G] display ntp-service status
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 3.0.1.31
Nominal frequency: 250.0000 Hz
Actual frequency: 249.9992 Hz
Clock precision: 2^19
Clock offset: 198.7425 ms
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 being 3, one stratum higher than S4200G 3.
d Display the information about the NTP sessions S4200G 1 and you can see that a
connection is established between S4200G 1 and S4200G 3.
[S4200G] display ntp-service sessions
source
********************************************************************
[1]3.0.1.31
note: 1 source(master),2 source(peer),3 selected,4 candidate,5
configured
refid st now
0.0.0.0 2 1
poll reach delay offset
64 377 26.1 199.53
dis
9.7