3com 4210 PWR 9-Port 3CR17341-91-ME 用户手册

C

HAPTER

 35: NTP C

ONFIGURATION

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A single device can have a maximum of 128 associations at the same time, 
including static associations and dynamic associations. A static association refers 
to an association that a user has manually created by using an NTP command, 
while a dynamic association is a temporary association created by the system 
during operation. A dynamic association will be removed if the system fails to 
receive messages from it over a specific long time. In the server/client mode, for 
example, when you carry out a command to synchronize the time to a server, the 
system will create a static association, and the server will just respond passively 

Associate the 
specified key 
with the 
correspondin
g 
broadcast/m
ulticast client 

Configure on 
the NTP 
broadcast server 

ntp-service 
broadcast-server 
authentication-keyid key-id 

■

In NTP broadcast server 
mode and NTP multicast 
server mode, you need to 
associate the specified key 
with the corresponding 
broadcast/multicast client

■

You can associate an NTP 
broadcast/multicast client 
with an authentication 
key while configuring NTP 
mode. You can also use 
this command to 
associate them after 
configuring the NTP 
mode. 

Configure on 
the NTP 
multicast server 

ntp-service 
multicast-server 
authentication-keyid key-id

Table 292   Configure NTP authentication on the server

Table 293   Optional NTP parameters configuration tasks

Optional 

“Configuring the Number of Dynamic 
Sessions Allowed on the Local Switch”  

Optional 

“Disabling an Interface from Receiving NTP 
messages” 

Optional

Table 294   Configure an interface on the local switch to send NTP messages

Enter system view 

system-view 

- 

Configure an interface on the 
local switch to send NTP 
messages 

ntp-service 
source-interface 
Vlan-interface vlan-id 

Required