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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
What NTP Operating Modes Does a CE Switch Support?

What NTP Operating Modes Does a CE Switch Support?

The following table lists the NTP operating modes supported by a CE switch.

Operating Mode

Usage Scenario

Deployment Location and Synchronization Direction

Unicast client/server mode

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.

You only need to configure the client. The server only needs to be configured with an NTP primary clock.

Note that the client can be synchronized to the server but the server cannot be synchronized to the client.

Symmetric peer mode

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.

You only need to configure 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.

Broadcast mode

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 broadcast mode.

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.

Multicast mode

The multicast mode applies to the high-speed network that has multiple clients and does not require high precision. In a typical scenario, one or more clock servers on the network periodically send multicast packets to clients, and the clients synchronize time based on the multicast packets.

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.

Manycast mode

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 do not need to be configured again due to a change of the server.

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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Updated: 2020-01-07

Document ID: EDOC1000060766

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