Configuring DHCP relay agent support for Option 82

To support Option 82, you must perform related configuration on both the DHCP server and relay agent. For DHCP server Option 82 configuration, see "Enabling handling of Option 82."

1. Enter system view.

   system-view

2. Enter interface view.

   interface interface-type interface-number

3. Enable the relay agent to handle Option 82.

   dhcp relay information enable

   By default, handling of Option 82 is disabled.

4. (Optional.) Configure the strategy for handling DHCP requests that contain Option 82.

   dhcp relay information strategy { drop | keep | replace }

   By default, the handling strategy is replace.

   If the handling strategy is replace, configure a padding mode and a padding format for Option 82. If the handling strategy is keep or drop, you do not need to configure a padding mode or padding format for Option 82.

5. (Optional.) Configure the padding mode and padding format for the Circuit ID sub-option.

   dhcp relay information circuit-id { bas | string circuit-id | { normal | verbose [ node-identifier { mac | sysname | user-defined node-identifier } ] [ interface ] } [ format { ascii | hex } ] }

   By default, the padding mode for Circuit ID sub-option is normal, and the padding format is hex.

   The device name (sysname) must not include spaces if it is configured as the padding content for sub-option 1. Otherwise, the DHCP relay agent will fail to add or replace Option 82.

6. (Optional.) Configure the padding mode and padding format for the Remote ID sub-option.

   dhcp relay information remote-id { normal [ format { ascii | hex } ] | string remote-id | sysname }

   By default, the padding mode for the Remote ID sub-option is normal, and the padding format is hex.