The option121 command specifies a classless static route that a DHCP server delivers to a DHCP client.
The undo option121 command deletes a classless static route that a DHCP server delivers to a DHCP client.
By default, no classless static route is specified.
option121 ip-address { ip-address1 mask-length1 gateway-address1 } [ ip-address2 mask-length2 gateway-address2 [ ip-address3 mask-length3 gateway-address3 [ ip-address4 mask-length4 gateway-address4 [ ip-address5 mask-length5 gateway-address5 [ ip-address6 mask-length6 gateway-address6 [ ip-address7 mask-length7 gateway-address7 [ ip-address8 mask-length8 gateway-address8 ] ] ] ] ] ] ]
undo option121 [ ip-address ip-address1 mask-length1 gateway-address1 ]
| Parameter | Description | Value |
|---|---|---|
| ip-address1 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| mask-length1 |
Specifies a mask length. |
The value is an integer ranging from 0 to 32. |
| gateway-address1 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| ip-address2 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| mask-length2 |
Specifies a mask length. |
The value is an integer ranging from 0 to 32. |
| gateway-address2 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| ip-address3 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| mask-length3 |
Specifies a mask length. |
The value is an integer ranging from 0 to 32. |
| gateway-address3 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| ip-address4 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| mask-length4 |
Specifies a mask length. |
The value is an integer ranging from 0 to 32. |
| gateway-address4 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| ip-address5 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| mask-length5 |
Specifies a mask length. |
The value is an integer ranging from 0 to 32. |
| gateway-address5 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| ip-address6 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| mask-length6 |
Specifies a mask length. |
The value is an integer ranging from 0 to 32. |
| gateway-address6 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| ip-address7 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| mask-length7 |
Specifies a mask length. |
The value is an integer ranging from 0 to 32. |
| gateway-address7 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| ip-address8 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| mask-length8 |
Specifies a mask length. |
The value is an integer ranging from 0 to 32. |
| gateway-address8 |
Specifies a gateway address. |
The value is in dotted decimal notation. |
| ip-address |
Specifies a destination IP address. |
The value is in dotted decimal notation. |
Usage Scenario
If a DHCP client cannot directly access the network based on the gateway address (carried in the Option 3 field), run the option121 command to specify a classless static route which carries a specified destination address and next-hop address that a DHCP server delivers to the DHCP client to guide traffic forwarding.
A mask length and a gateway address can be specified for a classless static route. A maximum of eight classless static routes can be configured by running the option121 command repeatedly.Prerequisites
A global address pool has been created using the ip pool (system view) command in the system view.
Precautions
The undo option121 command deletes all classless static routes.
To delete a specific classless static route, run the undo option121 ip-address gateway-address command. You are advised to configure the well-known Option 121 using the option121 command. If both the option and option121 commands are run to define the Option 121, the option121 command takes effect.<HUAWEI> system-view [~HUAWEI] ip pool global1 server [*HUAWEI-ip-pool-global1] option121 ip-address 10.10.10.10 24 10.10.10.1