Operation Manual – NTP
H3C S3100 Series Ethernet Switches
Chapter 1 NTP Configuration
1-16
1.6.1 Configuring an Interface on the Local Switch to Send NTP messages
Table 1-14
Configure an interface on the local switch to send NTP messages
Operation
Command
Description
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
Caution:
If you have specified an interface in the
ntp-service unicast-server
or
ntp-service
unicast-peer
command, this interface will be used for sending NTP messages.
1.6.2 Configuring the Number of Dynamic Sessions Allowed on the Local
Switch
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 upon the receipt of a message, rather than
creating an association (static or dynamic). In the symmetric mode, static associations
will be created at the symmetric-active peer side, and dynamic associations will be
created at the symmetric-passive peer side; In the broadcast or multicast mode, static
associations will be created at the server side, and dynamic associations will be
created at the client side.
Table 1-15
Configure the number of dynamic sessions allowed on the local switch
Operation
Command
Description
Enter system view
system-view
—
Configure the maximum
number of dynamic sessions
that can be established on
the local switch
ntp-service
max-dynamic-sessio
ns number
Required
By default, up to 100
dynamic sessions can be
established locally.