HP 5820X Switch - NTP Configuration Task List; Configuring the Operation Modes of NTP; Configuring NTP Client;Server Mode

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NOTE:
• A CE is a device that has an interface directly connecting to the SP. A CE is not “aware of” the
presence of the VPN.
• A PE is a device directly connecting to CEs. In an MPLS network, all events related to VPN processin
g
occur on the PE.
NTP configuration task list
Complete the following tasks to configure NTP:
Task Remarks
Configuring the operation modes of NTP Required
Configuring optional parameters of NTP Optional
Configuring access-control rights Optional
Configuring NTP authentication Optional
Configuring the operation modes of NTP
Devices can implement clock synchronization in one of the following modes:
• Client/server mode
• Symmetric mode
• Broadcast mode
• Multicast mode
For the client/server mode or symmetric mode, you must configure only clients or symmetric-active peers;
for the broadcast or multicast mode, you must configure both servers and clients.
NOTE:
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.
• A dynamic association is a temporary association created by the system durin
g
operation. A dynamic
association is removed if the system fails to receive messages from it over a specific long time.
In client/server mode, for example, when you execute a command to synchronize the time to a server,
the system creates a static association, and the server just responds passively upon the receipt of a
message, rather than creating an association (static or dynamic). In symmetric mode, static associations
are created at the symmetric-active peer side, and dynamic associations are created at the symmetric-
passive peer side. In broadcast or multicast mode, static associations are
created at the server side, and
dynamic associations are created at the client side.
Configuring NTP client/server mode
For devices working in client/server mode, make configurations on the clients, but not on the servers.