Configuring Ntp Peer Mode - 3Com Switch 4500 26-Port Configuration Manual

Configuring NTP Peer
Mode
Clock precision: 2^7
Clock offset: 0.0000 ms
Root delay: 0.00 ms
Root dispersion: 0.00 ms
Peer dispersion: 0.00 ms
Reference time: 00:00:00.000 UTC Jan 1 1900 (00000000.00000000)
# Set Switch1 to the NTP server of the Switch 4500.
<4500> system-view
[4500] ntp-service unicast-server 1.0.1.11
# (After the above configurations, the Switch 4500 is synchronized to
Switch1.) View the NTP status of the Switch 4500.
[4500] display ntp-service status
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 1.0.1.11
Nominal frequence: 250.0000 Hz
Actual frequence: 249.9992 Hz
Clock precision: 2^19
Clock offset: 0.66 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 above output information indicates that Switch4500 is synchronized with
Switch1, and the stratum level of its clock is 3, one level lower than that of
Switch1.
# View the information about NTP sessions of the Switch 4500. (You
can see that Switch2 establishes a connection with Switch1.)
[4500] display ntp-service sessions
source reference
***********************************************************************
[12345]1.0.1.11 127.127.1.0
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Network requirements
The local clock of Switch2 is set to the NTP master clock, with the clock stratum
level of 2.
A Switch 4500 considers Switch2 as the NTP server and serves as the client, while
Switch2 operates in server mode automatically. In addition, Switch3 considers the
Switch 4500 as its peer.
This example assumes that:
Switch2 is a switch that allows its local clock to be the master clock.
■
Switch3 is a switch that allows its local clock to be the master clock and the
■
stratum level of its clock is 1.
Configuration Examples
stra reach poll now offset
2 1 64 1
303
delay disper
350.1 15.1 0.0