Backup and Restore default configuration (/etc/sonic/config_db.json) Follow

Example: 

1. How to backup default setting and recovery to default backup setting.
2. Method 2 for reset default
3. Method 3 for reset default
4. Method 4 for reset default

Reference model:

• Switch model name:

- AS7726-32X

- AS7326-56X

- AS7816-64X

- AS5835-54X(T)

- AS4630-54PE

- AS9716-32D

- AS8000(Minipack)

- Wedge100BF-32X

• Edgecore SONiC version: 

- Edgecore-SONiC_20201123_130028_ec202006_74

- Edgecore-SONiC_20201229_070315_ec202006_101

- Edgecore-SONiC_20201229_070315_ec202006_bfn_65(Wedge100BF-32X)

Restriction:

1. known issue: Wrong alias names in the default configuration with "AS7326-56"
   

   admin@sonic:~$ show interfaces status
     Interface            Lanes    Speed    MTU    FEC    Alias    Vlan    Oper    Admin             Type    Asym PFC
   -----------  ---------------  -------  -----  -----  -------  ------  ------  -------  ---------------  ----------
     Ethernet0                3      25G   9100   none   Eth5/3  routed    down       up              N/A         N/A
     Ethernet1                2      25G   9100   none   Eth5/2  routed    down       up              N/A         N/A
     Ethernet2                4      25G   9100   none   Eth5/4  routed    down       up              N/A         N/A
     Ethernet3                8      25G   9100   none   Eth6/4  routed    down       up              N/A         N/A
     Ethernet4                7      25G   9100   none   Eth6/3  routed    down       up              N/A         N/A
     ... 
     omitted
     ...

Procedure :

Example 1. How to backup default setting and recovery to default backup setting.

Step1: Backup default configuration "config_db.json" after SONiC installation.

 admin@sonic:~$ sudo cp /etc/sonic/config_db.json /etc/sonic/config_db.json.bk

Step 2. If we want to reset the setting to default, replace current config_db.json by backup config.

admin@sonic:~$ sudo cp /etc/sonic/config_db.json.bk /etc/sonic/config_db.json

Step 3. config reload or power cycle the switch

admin@sonic:~$sudo config reload -y

Example 2: Method 2 for reset default

Step 1: Check the $Platform and $HwSKU information

admin@sonic:~$ show platform summary
Platform: x86_64-accton_as7326_56x-r0
HwSKU: Accton-AS7326-56X
ASIC: broadcom

Step 2: Set the $Platform and $HwSKU information to environment variable. 

admin@sonic:~$ export Platform=x86_64-accton_as7326_56x-r0
admin@sonic:~$ export HwSKU=Accton-AS7326-56X

Step 3: Generate the default setting same as initial installed.

admin@sonic:~$ sudo sonic-cfggen -H -p /usr/share/sonic/device/$Platform/platform.json --preset t1 -k $HwSKU > ~/default.json

Step 4: Replace the "default.json" to the correct position.

admin@sonic:~$ sudo cp default.json /etc/sonic/config_db.json

Step 5. Config reload or power cycle the switch

admin@sonic:~$sudo config reload -y

Example 3: Method 3 for reset default

Upload and Execute the script  restore_202006.sh on the SONiC  

The script generates default configuration config_db.json automatically.  Reboot the switch or reload configuration to take effect.

Step 1: Set the management IP

admin@sonic:~$ sudo config interface ip add eth0 192.168.10.1/24

Step 2: Upload the Script to the SONiC

admin@sonic:~$ sudo scp root@192.168.10.2:/root/restore_202006.sh ~/  

Step 3: Change permission of script.

admin@sonic:~$ chmod +x restore_202006.sh

Step 4: Running the script.

admin@sonic:~$ ./restore_202006.sh

Step 5. config reload or power cycle the switch

admin@sonic:~$ sudo config reload -y

admin@sonic:~$ sudo mv /etc/sonic/config_db.json /etc/sonic/config_db.json.modified

admin@sonic:~$ show ztp
ZTP Admin Mode : False
ZTP Service : Inactive
ZTP Status : Not Started

ZTP Service is not running

admin@sonic:~$ sudo config ztp enable
Running command: ztp enable
admin@sonic:~$ sudo reboot

Step 4: Check the current SONiC's config folder.

admin@sonic:~$ sudo ls /etc/sonic/ | grep config_db.json
config_db.json.modified

Step 5: Disable ZTP function, and then check the SONiC's config folder.

admin@sonic:~$ sudo config ztp disable

Active ZTP session will be stopped and disabled, continue? [y/N]: y

admin@sonic:~$ sudo ls /etc/sonic/ | grep config_db.json
config_db.json
config_db.json.modified
admin@sonic:~$