H3C Technologies H3C S3100 Series Switches - Manual (Page 526)

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If a DHCP server is configured to ignore Option 82, after the DHCP server receives packets containing
Option 82, the DHCP server will not add Option 82 into the responses when assigning IP addresses and
other configuration information to the clients.
Follow these steps to configure the DHCP server to process Option 82:
To do… Use the command… Remarks
Enter system view system-view —
Enable the DHCP server to
process Option 82 dhcp server relay
information enable
Optional
By default, the DHCP server
supports Option 82.
Displaying and Maintaining the DHCP Server
To do… Use the command… Remarks
Display the statistics on IP
address conflicts display dhcp server conflict { all | ip
ip-address }
Display lease expiration
information
display dhcp server expired { ip ip-address |
pool [ pool-name ] | interface [ interface-type
interface-number ] | all }
Display the free IP addresses display dhcp server free-ip
Display information about
address binding
display dhcp server ip-in-use { ip ip-address |
pool [ pool-name ] | interface [ interface-type
interface-number ] | all }
Display the statistics on a
DHCP server
display dhcp server statistics
Display information about
DHCP address pool tree
display dhcp server tree { pool [ pool-name ] |
interface [ interface-type interface-number ] |
all }
Available in
any view
Clear IP address conflict
statistics
reset dhcp server conflict { all | ip ip-address }
Clear dynamic address binding
information
reset dhcp server ip-in-use { ip ip-address |
pool [ pool-name ] | interface [ interface-type
interface-number ] | all }
Clear the statistics on a DHCP
server
reset dhcp server statistics
Available in
user view
Executing the save command will not save the lease information on a DHCP server to the flash memory.
Therefore, the configuration file contains no lease information after the DHCP server restarts or you
clear the lease information by executing the reset dhcp server ip-in-use command. In this case, any
lease-update requests will be denied, and the clients must apply for IP addresses again.