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S12700 V200R010C00 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
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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).
CSS Upgrade

CSS Upgrade

A CSS can be upgraded using the traditional upgrade method (specifying the next-startup files and restarting the entire CSS) or the fast upgrade function.

The traditional upgrade method causes service interruption for a relatively long time and is therefore not applicable to scenarios requiring short service interruption time. The fast upgrade function is more suited to these scenarios.

In a fast upgrade, the standby switch first restarts with the new system software. Data traffic is forwarded by the master switch during this period. After the standby switch completes the upgrade, it becomes the master switch and starts to forward data traffic. Then the original switch restarts with the new system software. After the original switch completes the upgrade, it becomes the standby switch. If the standby switch fails in the upgrade, it restarts and rolls back to the old version, and the CSS upgrade fails.

You are advised to bundle CSS uplinks and downlinks into Eth-Trunks for link redundancy. Otherwise, data traffic may be interrupted for several minutes based on the service deployment.

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Updated: 2019-08-21

Document ID: EDOC1000142080

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