Will the configuration of an AR router be lost after the SRU is replaced

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The configuration file of an AR router is stored in the storage medium of the SRU.
For a single-control router, the configuration of a router is subject to the new SRU.
For a dual-control router, the router automatically copies the configuration file to the standby SRU after the active SRU is switched over to the standby SRU.

Other related questions:
Why is the DHCP configuration lost on an AR after a while
If Auto-Config is enabled, the AR will periodically clear all DHCP configurations, causing DHCP configuration loss. To solve the problem, perform the following steps: 1. Run the undo autoconfig enable command on the AR to disable Auto-Config. 2. Wait for 4 or 5 minutes and run the display autoconfig-status command to check the Auto-Config status. If the value of Running is NO, the Auto-Config function has been disabled. 3. Perform the configuration and run the save command.

What should I do if the configuration of an AR router is lost
Restore the configuration file from the storage.
1. Restore the configuration file in the router sd as the configuration file for the current system.
<Huawei> copy sd1:/backup.cfg sd1:/config.cfg
2. Restart the router to complete the configuration restoration.
<Huawei> reboot
Info: The system is comparing the configuration, please wait.
Warning: All the configuration will be saved to the next startup configuration. Continue? [y/n]: n
System will reboot! Continue? [y/n]: y
Info: system is rebooting ,please wait...

The packets sent to an IP address in a configured NAT address pool are discarded
Q: The packets sent to an IP address in a configured NAT address pool are discarded. You can run the ip route-static command to configure a static route to the IP address. The default priority of a static route is 60, which is higher than that of the UNR. This prevents packets sent to an IP address in the address pool from being discarded. The causes are as follows: After a NAT address pool is configured on an interface, a 32-bit local user network route (UNR) is automatically generated, and its priority is 64. When a packet to be sent to an IP address in the address pool passes the router, it matches the 32-bit local UNR and is sent to the protocol stack. However, the router cannot forward the packet because it does not have the protocol stack of the IP address. The packet is discarded. Therefore, you need to configure a static route with the default priority higher than that of the UNR.

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