3com 3031 Instruccion De Instalación

C

HAPTER

 9: NTP C

ONFIGURATION

[Router3]ntp-service reliable authentication-keyid 88

e Enter the interface Ethernet1/0/0 view.

[Router4]interface ethernet 1/0/0 

Set the local router as NTP broadcast Client.

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

In the above configuration, Router4 is configured to listen to broadcast messages 
from Ethernet1/0/0 and Router3 is configured to transmit broadcast packets from 
Ethernet1/0/0. 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

clock stratum: 4 

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 disper: 208.39 ms

peer disper: 9.63 ms

reference time: 17:03:32.022 UTC Sep 6 2003(BF422AE4.05AEA86C)

Now Router4 is synchronized with Router3. Its stratum number is 4, which is 1 
number larger than that of Router3.

Router3 sets the local clock as the NTP master clock and the stratum number is 2. 
It transmits multicast packets from Ethernet 1/0/0. Router4 and Router1 are set to 
listen to the multicast message from their interfaces respectively. 

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 multicast server. 

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

2 Configure Router4

a Enter the system view.