3com 4210 User Manual

The local clock of the Switch 5500, 5500G, or 4210 cannot be set as a reference 
clock. It can synchronize other devices as a reference clock only when its clock is 
synchronized.

Figure 85   Network diagram for NTP multicast mode configuration

 

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The local clock of Device C is to be used as a reference source, with the stratum 
level of 2. Set Device C to work in the multicast server mode and send 
multicast through its VLAN-interface 2.

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Device A and Device D are Switch 5500s. Set Device A and Device D to work in 
the multicast client mode and listen to multicasts through their VLAN-interface 
2 respectively.

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Configure Device C.

# Set Device C to work as the multicast server and send multicasts through its 
VLAN-interface 2.

<DeviceC> system-view

[DeviceC] interface Vlan-interface 2

[DeviceC-Vlan-interface2] ntp-service multicast-server 

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Configure Device A (perform the same configuration on Device D).

# Set Device A to work as the multicast client and listen multicasts through its 
VLAN-interface 2.

Vlan-int2
3.0 .1.11/24

Vlan- int2

3.0.1 .12 /24

Vlan -int2

3.0.1.13 /24

Vlan -int2

3.0.1.14/24

Vlan -int2
3.0.1.12 /24

Device A

Device B

Device C

Device D

Switch 5500

Release V03.02.04 

All versions

Switch 5500G

Release V03.02.04 

All versions

Switch 4500

Release V03.03.00 

All versions

Switch 4210

Release V03.01.00 

All versions