Before performing a software upgrade on Huawei datacom products, what is the required action?

The required action before performing a software upgrade on Huawei datacom products is to briefly review the upgrade guide. This is essential because the upgrade guide contains critical information on the procedures to follow, potential risks, prerequisites, and specific steps that need to be taken to ensure a smooth upgrade process. Understanding these details helps in preventing issues such as system incompatibility or data loss during the upgrade.

In contrast to the other options, reading the entire user manual may provide comprehensive information but is often unnecessary for a specific task like an upgrade and can be time-consuming. Consulting with a technical expert can be helpful but is not always feasible or available for every user. Skipping any documentation at all can lead to significant risks, including operational disruptions or failures if the upgrade is not executed properly. Therefore, a brief review of the upgrade guide strikes the right balance between ensuring adequate preparation and efficiency.