3com S7906E Istruzione Sull'Installazione

 

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# Configure Switch C to work in the multicast server mode and send multicast messages through 

VLAN-interface 2.  

[SwitchC] interface vlan-interface 2 

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

2)  Configuration on Switch D: 

# Configure Switch D to work in the multicast client mode and receive multicast messages on 

VLAN-interface 2.  

<SwitchD> system-view 

[SwitchD] interface vlan-interface 2  

[SwitchD-Vlan-interface2] ntp-service multicast-client 

Because Switch D and Switch C are on the same subnet, Switch D can receive the multicast messages 

from Switch C without being enabled with the multicast functions and can be synchronized to Switch C.  

# View the NTP status of Switch D after clock synchronization.  

[SwitchD-Vlan-interface2] display ntp-service status 

 Clock status: synchronized 

 Clock stratum: 3  

 Reference clock ID: 3.0.1.31 

 Nominal frequency: 100.0000 Hz  

 Actual frequency: 100.0000 Hz  

 Clock precision: 2^18 

 Clock offset: 0.0000 ms  

 Root delay: 31.00 ms  

 Root dispersion: 8.31 ms  

 Peer dispersion: 34.30 ms  

 Reference time: 16:01:51.713 UTC Sep 19 2005 (C6D95F6F.B6872B02) 

As shown above, Switch D has been synchronized to Switch C, and the clock stratum level of Switch D 

is 3, while that of Switch C is 2.  

# View the NTP session information of Switch D, which shows that an association has been set up 

between Switch D and Switch C.  

[SwitchD-Vlan-interface2] display ntp-service sessions 

      source    reference    stra  reach  poll  now  offset   delay  disper 

************************************************************************** 

[1234] 3.0.1.31  127.127.1.0   2   254     64    62   -16.0    31.0   16.6 

note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured 

Total associations :  1 

3)  Configuration on Switch B: 

Because Switch A and Switch C are on different subnets, you must enable the multicast functions on 

Switch B before Switch A can receive multicast messages from Switch C.  

# Enable IP multicast routing and IGMP.  

<SwitchB> system-view 

[SwitchB] multicast routing-enable 

[SwitchB] interface vlan-interface 2 

[SwitchB-Vlan-interface2] pim dm 

[SwitchB-Vlan-interface2] quit 

[SwitchB] vlan 3