3com 5500-SI Manual Do Utilizador

C

HAPTER

 22: F

ILE

 S

YSTEM

 M

ANAGEMENT

Switch 3 sets the local clock as the master clock at stratum 2 and multicast packets 
from Vlan-interface2. Set Switch 4 and Switch 1 to receive multicast messages from 
their respective Vlan-interface2. (Note that Switch 3 must support setting local clock 
as the NTP master clock.)

1 Configure Switch 3: 

a Enter System View. 

<switch3> system-view

b Set the local clock as the NTP master clock at stratum 2. 

[switch3]ntp-service refclock-master 2

c Enter Vlan-interface2 view. 

[switch3]interface vlan-interface 2

d Set it as a multicast server. 

[switch3-Vlan-Interface2]ntp-service multicast-server

2 Configure Switch 4: 

a Enter System View. 

<switch4> system-view

b Enter Vlan-interface2 view. 

[switch4]interface vlan-interface 2 

c Enable multicast client mode.

[switch4-Vlan-Interface2]ntp-service multicast-client

3 Configure Switch 1: 

a Enter System View. 

<switch1> system-view

b Enter Vlan-interface2 view. 

[switch1]interface vlan-interface 2

c Enable multicast client mode. 

[switch1-Vlan-Interface2]ntp-service multicast-client

The above examples configure Switch 4 and Switch 1 to receive multicast messages 
from Vlan-interface2, Switch 3 multicast messages from Vlan-interface2. Since Switch 
1 and Switch 3 are not located on the same segments, Switch 1 cannot receive the 
multicast packets from Switch 3, while Switch 4 is synchronized by Switch 3 after 
receiving the multicast packet.