H3C Technologies H3C S3600 Series Switches - Manual (Page 680)

3-9
Configuring the DHCP Relay Agent to Support Option 82
Prerequisites
Before configuring Option 82 support on a DHCP relay agent, you need to:
z Configure network parameters and relay function of the DHCP relay device.
z Perform assignment strategy-related configurations, such as network parameters of the DHCP
server, address pool, and lease time.
z The routes between the DHCP relay agent and the DHCP server are reachable.
Enabling Option 82 support on a DHCP relay agent
Follow these steps to enable Option 82 support on a DHCP relay agent:
To do… Use the command… Remarks
Enter system view system-view —
Enable Option 82 support on
the DHCP relay agent dhcp relay information
enable Required
Disabled by default.
Configure the strategy for the
DHCP relay agent to process
request packets containing
Option 82
dhcp relay information
strategy { drop | keep |
replace }
Optional
By default, the replace strategy
is adopted
z By default, with the Option 82 support function enabled on the DHCP relay agent, the DHCP relay
agent will adopt the replace strategy to process the request packets containing Option 82. However,
if other strategies are configured before, then enabling the 82 support on the DHCP relay agent will
not change the configured strategies.
z To enable Option 82, you need to perform the corresponding configuration on the DHCP server
and the DHCP relay agent.
Configuring DHCP Inform Message Handling Feature Used in IRF
System
Follow these steps to enable the DHCP relay agent to replace the XID in DHCP Inform messages:
To do… Use the command… Remarks
Enter system view system-view —
Enable UDP Helper udp-helper enable
Required
Disabled by default.
Enable the DHCP relay agent
to replace the XID in DHCP
Inform messages
dhcp relay inform replace
enable Optional
Enabled by default.