808 CHAPTER 57: DHCP SERVER CONFIGURATION
Configuring the
Handling Mode for
Option 82
When the DHCP server receives a message with Option 82, if the server is
configured to handle Option 82, it will return a response message carrying Option
82 to assign an IP address to the requesting client.
If the server is configured to ignore Option 82, it will assign an IP address to the
client without adding Option 82 in the response message.
Configuration prerequisites
Before performing this configuration, complete the following configuration on the
DHCP server:
■ Enable DHCP
■ Configure the DHCP address pool
Configuring the handling mode for Option 82
Follow these steps to enable the DHCP server to handle Option 82:
n
To support Option 82, it is required to perform configuration on both the DHCP
server and relay agent (or the device enabled with DHCP Snooping). Refer to
“Configuring the DHCP Relay Agent to Support Option 82” on page 818 and
“Configuring DHCP Snooping to Support Option 82” on page 828 for related
configuration details.
Displaying and
Maintaining the DHCP
Server
To do… Use the command… Remarks
Enter system view system-view -
Enable the server to handle
Option 82
dhcp server relay
information enable
Optional
Enabled by default.
To do… Use the command… Remarks
Display information about IP
address conflicts
display dhcp server conflict { all | ip
ip-address }
Available in any
view
Display information about
lease expiration
display dhcp server expired { all | ip
ip-address | pool [ pool-name ]}
Display information about
assignable IP addresses
display dhcp server free-ip
Display IP addresses excluded
from dynamic allocation in the
DHCP address pool
display dhcp server forbidden-ip
Display information about
bindings
display dhcp server ip-in-use { all | ip
ip-address | pool [ pool-name ]}
Display information about
DHCP server statistics
display dhcp server statistics
Display information about the
address pool tree organization
display dhcp server tree { all | pool
[ pool-name ]}
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