3com 3031 Instruccion De Instalación

C

HAPTER

 9: NTP C

ONFIGURATION

See Figure 16.

1 Configure Router3

a Enter the system view.

<Router3>system-view

b Set the local clock as the NTP master clock and the stratum number is 2.

[Router3]ntp-service refclock-master 2

c Enter the interface Ethernet 1/0/0 view.

[Router3]interface ethernet 1/0/0

d Set the broadcast server.

[Router3-Ethernet1/0/0]ntp-service broadcast-server

2 Configure Router4

a Enter the system view.

<Router4>system-view

b Enter the interface Ethernet 1/0/0 view. 

[Router4]interface ethernet 1/0/0 

[Router4-Ethernet1/0/0]ntp-service broadcast-client

3 Configure Router1

a Enter the system view.

<Router1>system-view

b Enter the interface Ethernet 1/0/0 view.

[Router1]interface ethernet 1/0/0

[Router1-Ethernet1/0/0]ntp-service broadcast-client

In the above configuration, Router4 and Router1 are configured to listen to 
broadcast messages from Ethernet 1/0/0 and Router3 is configured to transmit 
broadcast packets from Ethernet 1/0/0. Because Router1 and Router3 are on 
different network segment, Router1 cannot receive the broadcast packets 
transmitted by Router3. Router4 is synchronized with Router3 after receiving the 
broadcast packets transmitted by Router3. 

The state of Router4 after synchronization includes: 

<Router4>display ntp-service status

clock status: synchronized, stratum: 3, reference clock ID: 3.0.1.31

nominal freq: 250.0000 Hz, actual freq: 249.9992 Hz, precision: 

2**19

offset: 198.7425 ms, reftime: 17:03:32.022 UTC Thu Sep 6 2001 

(BF422AE4.05AEA86C)

root delay : 27.47 ms, root disper: 208.39 ms, peer disper: 9.63 ms

Now Router4 is synchronized with Router3. Its stratum number is 3, which is 1 
number larger than that of Router3. 

The association state of Router4 displays that Router4 has established connection 
with Router3.