set protocols dhcp snooping vlan option82-policy

The set protocols dhcp snooping vlan option82-policy command configures how to handle the Option 82 field when receiving a DHCP Discover/Request/Release/Decline/Inform message with Option 82 on VLANs where DHCP snooping is enabled.

Command Syntax

set protocols dhcp snooping vlan <vlan-id> option82-policy <drop | keep | insert | replace>

Parameters

Parameter

Description

vlan <vlan-id>

Specifies a VLAN. The value is an integer that ranges from 1 to 4094.

option82-policy <drop | keep | insert | replace>

Specifies the policy for Option 82. The value could be drop, keep, insert or replace.

drop: drop the packet if have Option 82. If the received DHCP packets have no Option 82 values, the packets will be forwarded.
keep: Option 82 in the packet remains unchanged and forwarded.
insert: the existing Option 82 sub-options remain unchanged, and the non-existing Option 82 sub-options will be inserted with the value the administrator configured, then forward the packet to the DHCP server.
replace: The non-existing Option 82 sub-options, will be inserted with the value the administrator configured. The existing Option 82 sub-options will be replaced with the value administrator configured, and then forward the packet.

The default value is keep.

Usage Guidelines

Option 82 policy is used when receiving a DHCP Discover/Request/Release/Decline/Inform message from the DHCP client. When option82-policy is set to “insert” or “replace”, you can use the following commands to set the format of circuit ID and remote ID sub-options:

set protocols dhcp snooping option82 circuit-id <port-index | port-name | port-description>

set protocols dhcp snooping option82 remote-id <system-mac | hostname>

We can use the following table to summarize the Option 82 policy.

For details about how Option 82 is processed by the DHCP snooping and DHCP relay module, see /wiki/spaces/PicOS44sp/pages/4295125.

Example

Configure the Option 82 policy.

admin@Xorplus# set protocols dhcp snooping vlan 12 option82-policy insert