Huawei AR150 Series Configuration Manual page 110

Huawei AR150&200&1200&2200&3200 Series Enterprise
Routers
Configuration Guide - Device Management
Operating
Mode
Unicast
client/server
mode
Symmetric
peer mode
Broadcast
mode
Multicast
mode
Manycast
mode
Issue 05 (2014-01-16)
Usage Scenario
The unicast client/server mode is used on a
higher stratum on a synchronization subnet.
In this mode, the IP address of the server
needs to be obtained in advance.
The symmetric peer mode is used on a lower
stratum on the synchronization subnet. In this
mode, a symmetric active peer and a
symmetric passive peer can be synchronized
with each other. To be specific, a symmetric
peer of a higher stratum is synchronized to a
symmetric peer of a lower stratum.
When the IP address of a server or a
symmetric peer is not determined, or when
the clocks of a large number of devices need
to be synchronized on a network, clock
synchronization can be implemented in the
broadcast mode.
The multicast mode applies to the high-speed
network that has multiple workstations and
does not require high accuracy. In a typical
scenario, one or more clock servers on the
network periodically send multicast packets
to the workstations. The delay of packet
transmission in a LAN is at the milliseconds
level.
The manycast mode applies to the scenario
where servers are scattered on a network. The
client can discover and synchronize to the
closest manycast server. The manycast mode
applies to the scenario where the servers are
not stable and clients on the entire network
need not to be configured again due to a
change of the server.
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5 NTP Configuration
Deployment Location
and Synchronization
Direction
You need to configure only
the client. The server needs to
be configured with only an
NTP primary clock.
Note that the client can be
synchronized to the server
but the server cannot be
synchronized to the client.
You need to configure only
the symmetric active peer.
The symmetric passive peer
does not need to be
configured with an NTP
command.
In symmetric peer mode, a
symmetric peer of a higher
stratum is synchronized to a
symmetric peer of a lower
stratum.
Relevant commands need to
be run on the server and the
client.
Note that the client can be
synchronized to the server
but the server cannot be
synchronized to the client.
Relevant commands need to
be run on the server and the
client.
Note that the client can be
synchronized to the server
but the server cannot be
synchronized to the client.
Relevant commands need to
be run on the server and the
client.
Note that the client can be
synchronized to the server
but the server cannot be
synchronized to the client.
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