Example for Configuring Link Backup by Using the Interface Backup Mode on an ISDN Network (C-DCC+Dialer Number Backup) - NetEngine AR V300R019 CLI-based Configuration Guide - WAN - Huawei
Backup switch configuration with eSight failed- Huawei
HUAWEI 5735 L48p4X A1 - Configuring system startup from backup config. - YouTube