3Com Switch 4500 26-Port, Configuration Manual

Page: 306 / 396

304 C
HAPTER
18: NTP C
ONFIGURATION
Figure 86 Network diagram for NTP peer mode configuration
Configuration procedure
1 Configure the Switch 4500.
# Set Switch2 to the NTP server.
<SW4500> system-view
[SW4500] ntp-service unicast-server 3.0.1.31
2 Configure Switch3 (after the SW4500 Ethernet switch is synchronized to Switch2).
# Enter system view.
<Switch3> system-view
[Switch3]
# Set the SW4500 Ethernet switch to the peer of Switch3.
[Switch3] ntp-service unicast-peer 3.0.1.33
The SW4500 Ethernet switch and Switch3 are a pair of peers. Switch3 operates in
active peer mode, while the SW4500 Ethernet switch operates in passive peer
mode. Because the stratum level of the local clock of Switch3 is 1, and that of the
SW4500 Ethernet switch is 3, the SW4500 Ethernet switch is synchronized to
Switch3.
View the status of the SW4500 Ethernet switch after synchronization.
[Sw4500] display ntp-service status
Clock status: synchronized
Clock stratum: 2
Reference clock ID: 3.0.1.32
Nominal frequency: 250.0000 Hz
Actual frequency: 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 output information indicates that the SW4500 Ethernet switch is synchronized
to Switch3 and the stratum level of its local clock is 2, one level lower than that
Switch3.
3.0.1.31/24
3.0.1.32/24 3.0.1.33/24
SW4500
3.0.1.31/24
3.0.1.32/24 3.0.1.33/24
3.0.1.31/24
3.0.1.32/24 3.0.1.33/24
Switch2
3.0.1.31/24
3.0.1.32/24 3.0.1.33/24
Switch3