access-user dhcp save-file
Function
The access-user dhcp save-file command writes DHCPv4 user information saved in the high-end memory to the CF card and specifies the directory and file name. The DHCPv4 users include those who share one MAC address but go online from multiple sessions.
By default, DHCPv4 user information saved in the high-end memory is not written to the CF card.
This command is supported only on the NetEngine 8000 F1A.
Parameters
| Parameter | Description | Value |
|---|---|---|
| save-file file-name |
Specifies the directory and name of the file to which DHCPv4 user information saved in the high-end memory is written. |
The name is a string of 1 to 64 case-insensitive characters. If you want to save DHCPv4 user information in the CF card of the main control board, specify the directory and file name as cfcard:/autosave/*.bak or *.bak. The file name extension must be .bak. |
Usage Guidelines
Usage Scenario
If the device is powered off and restarted, DHCPv4 user information saved in the high-end memory will be lost, affecting services. Run the access-user dhcp save-file command before powering off the device to write the DHCPv4 user information saved in the high-end memory to the CF card. After the device is restarted, run the access-user dhcp recover-file command to restore the DHCPv4 user information saved in the CF card to the high-end memory. The device then allows DHCPv4 users whose information is saved in the high-end memory to go online automatically.
Prerequisites
- The access-user dhcp auto-save command has been run to enable automatic backup of DHCPv4 user information globally and configure the maximum number of the DHCPv4 users.
- The access-user dhcp auto-save enable (domain view) command has been run to enable automatic backup of DHCPv4 user information in a domain.
Configuration Impact
Note:
If there is a large amount of DHCPv4 user information saved in the high-end memory, it takes a long time for the access-user dhcp save-file command to write the information to the CF card, which may affect services. Exercise caution when you run this command. The information takes up storage space in the CF card. The more users whose information is saved in the CF card, the more storage space the information takes up. If DHCPv4 user information changes when the command is being executed, the changed information cannot be written to the CF card.Follow-up Procedure
Run the access-user dhcp auto-recover enable command to enable automatic DHCPv4 user login.
After the device is restarted, run the access-user dhcp recover-file command to restore the DHCPv4 user information saved in the CF card to the high-end memory.Precautions
This command is supported only on the admin VS.
NOTE: The following DHCPv4 user information is saved: MAC address, IP address, VLAN, access interface, VPN instance name, domain name, lease, Option 82, Option 60, Option 61, and IP address of the DHCPv4 server. The DHCPv4 user information is used only when the DHCPv4 users go online automatically. To ensure security, do not save DHCPv4 user information in the CF card for a long time and clear it in time.Example
<HUAWEI> system-view [~HUAWEI] access-user dhcp auto-save max-user-number 16000 [~HUAWEI] aaa [~HUAWEI-domain] domain test [~HUAWEI-domain-test] commit [~HUAWEI-domain-test] access-user dhcp auto-save enable [~HUAWEI] access-user dhcp save-file cfcard:/autosave/user.bak