Huawei Quidway S8500 Series Command Manual page 249

Command Manual – Network Protocol
Quidway S8500 Series Routing Switches
View
System view
Parameter
None
Description
Use the dhcp server relay information enable command to enable the function of
Option 82 support on DHCP server.
Use the undo dhcp server relay information enable command to disable the
function of Option 82 support on DHCP server.
When a client connected to a DHCP relay broadcasts a DHCP request packet, the
DHCP relay is responsible for forwarding the packet to a DHCP server. After Option 82
support is enabled on the DHCP server, if the request packet forwarded by the DHCP
relay to the DHCP server carries Option 82, the response packet sent by the DHCP
server will carry a response Option 82.
After receiving the response packet from the DHCP server to the DHCP client, the
DHCP relay check whether Option 82 exists in the packet. If yes, it strips Option 82.
That is, the response packet sent to the client does not carry Option 82.
By default, the function is enabled. That is, the DHCP server will return Option 82
carried in the request packet to the DHCP relay.
Related command: dhcp relay information enable.
Example
# Enable the DHCP server to return Option 82 carried in the request packets to the
DHCP relay.
<Quidway> system-view
System View: return to User View with Ctrl+Z
[Quidway] dhcp server relay information enable
# Disable the DHCP server from returning Option 82 carried in the request packets to
the DHCP relay.
[Quidway] undo dhcp server relay information enable
Chapter 5 DHCP Option 82 Configuration Commands
Huawei Technologies Proprietary
5-3