Configuring Option 82

Follow these guidelines when you configure Option 82:

To configure DHCP snooping to support Option 82:

Step

Command

Remarks

1. Enter system view.

system-view

N/A

2. Enter interface view.

interface interface-type interface-number

N/A

3. Enable DHCP snooping to support Option 82.

dhcp snooping information enable

By default, DHCP snooping does not support Option 82.

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

dhcp snooping information strategy { drop | keep | replace }

By default, the handling strategy is replace.

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

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

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

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

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

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