NTP Configuration Task list 953
messages set to 5 (multicast mode). Clients listen to the multicast messages from
servers. After a client receives the first multicast message, the client and the server
start to exchange messages, with the Mode field set to 3 (client mode) and 4
(server mode) to calculate the network delay between client and the server. Then,
the client enters the multicast client mode and continues listening to multicast
messages, and synchronizes its local clock based on the received multicast
messages.
n
In symmetric peers mode, broadcast mode and multicast mode, the client (or the
symmetric active peer) and the server (the symmetric passive peer) can work in the
specified NTP working mode only after they exchange NTP messages with the
Mode field being 3 (client mode) and the Mode field being 4 (server mode).
During this message exchange process, NTP clock synchronization can be
implemented.
NTP Configuration
Task list
Complete the following tasks to configure NTP:
Configuring the
Operation Modes of
NTP
Switches can implement clock synchronization in one of the following modes:
■ Server/client mode
■ Symmetric mode
■ Broadcast mode
■ Multicast mode
For the server/client mode or symmetric mode, you need to configure only clients
or symmetric-active peers; for the broadcast or multicast mode, you need to
configure both servers and clients.
n
A single switch 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.
Task Remarks
“Configuring the Operation Modes of NTP” on page 953 Required
“Configuring Optional Parameters of NTP” on page 956 Optional
“Configuring Access-Control Rights” on page 957 Optional
“Configuring NTP Authentication” on page 958 Optional
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