PLANET XGS3-24040 - Manual (Page 351)

26-64
Chapter 26 Commands for DHCP
Option 82
26.1 ip dhcp relay information option
Command:
ip dhcp relay information option
no ip dhcp relay information option
Function:
Set this command to enable the option82 function of the switch Relay Agent. The “no ip dhcp relay
information option” command is used to disable the option82 function of the switch Relay Agent.
Parameters:
None.
Default Settings:
The system disables the option82 function by default.
Command Mode:
Global configuration mode
Usage Guide:
Only the DHCP Relay Agents configuring with this command can add option82 to the DHCP request
message, and let the server to process it. Before enabling this function, users should make sure
that the DHCP service is enabled and the Relay Agent will transmit the udp broadcast messages
whose destination port is 67.
Example:
Enable the option82 function of the Relay Agent.
Switch(config)#service dhcp
Switch(config)# ip forward-protocol udp bootps
Switch(config)# ip dhcp relay information option
26.2 ip dhcp relay information policy
Command:
ip dhcp relay information policy {drop | keep | replace
no ip dhcp relay information policy
Function:
This command is used to set the retransmitting policy of the system for the received DHCP request
message which contains option82. The drop mode means that if the message has option82, then
the system will drop it without processing; keep mode means that the system will keep the original
option82 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”.