R3204P16-HP Load Balancing Module System Management Configuration Guide-6PW101

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• An NTP server on a PE can synchronize the NTP clients on multiple CEs in different VPNs.

NOTE:

• A CE is a device that has an interface directly connecting to the service provider (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

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 the local clock as a reference source Optional

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 client/server mode or symmetric mode, you need to configure only clients or symmetric-active peers;

for broadcast or multicast mode, you need to configure both servers and clients.

NOTE:

• A sin

le device can have a maximum of 128 associations at the same time, includin

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

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 simply 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.