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S2989G-24TX Operation Manual

Chapter 3 IP services Configuration

3-48

6. Configure creation method of option82

7. Diagnose and maintain DHCP option 82

1. Enabling the DHCP option 82 of the Relay Agent.

Command

Explanation

Global mode

ip dhcp relay information option

no ip dhcp relay information option

Set this command to enable the option

82 function of the switch Relay Agent.

The “no ip dhcp relay information option”

is used to disable the option 82 function

of the switch Relay Agent.

2. Configure the DHCP option 82 attributes of the interface

Command

Explanation

Interface configuration mode

This command is used to set the

retransmitting policy of the system for the

received DHCP request message which

contains option 82. The drop mode

means that if the message has option82,

then the system will drop it without

processing; keep mode means that the

ip dhcp relay information policy {drop

| keep | replace}

no ip dhcp relay information policy

system will keep the original option 82

segment in the message, and forward it

to the server to process; replace mode

means that the system will replace the

option 82 segment in the existing

message with its own option 82, and

forward the message to the server to

process. The “no ip dhcp relay

information policy” will set the

retransmitting policy of the option 82

DCHP message as “replace”.