3Com Switch 7750 Configuration Guide

Displaying and Maintaining a DHCP Server 607
Displaying and
Maintaining a DHCP
Server
After the above configuration, execute the display command in any view to
display and verify the DHCP server configuration.
Execute the reset command in user view to clear DHCP server configuration
information.
n
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.
DHCP Server
Configuration
Example
Currently, DHCP networking can be implemented in two ways. One is to deploy
the DHCP server and DHCP clients in the same network segment. This enables the
clients to communicate with the server directly. The other is to deploy the DHCP
server and DHCP clients in different network segments. In this case, IP address
assigning is carried out through DHCP relay agent. Note that DHCP server
configuration is the same in both scenarios.
Network requirements
The DHCP server assigns IP addresses dynamically to the DHCP clients on the same
network segment. The network segment 10.1.1.0/24, to which the IP addresses of
the address pool belong, is divided into two sub-network segments: 10.1.1.0/25
and 10.1.1.128/25. The switch operating as the DHCP server hosts two VLANs,
whose interface IP addresses are 10.1.1.1/25 and 10.1.1.129/25 respectively.
Table 480 Display and maintain DHCP server configuration
Operation Command Description
Display the statistics on IP
address conflicts
display dhcp server conflict { all | ip
ip-address }
You can execute
the display
command in any
view.
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 }
Clear IP address conflict
statistics
reset dhcp server conflict { all | ip
ip-address }
You can execute
the reset
command in
user view.
Clear dynamic address
binding information
reset dhcp server ip-in-use { ip ip-address
| pool [ p
ool-name ] | interface
[ interface-type interface-number ] | all }
Clear the statistics on a DHCP
server
reset dhcp server statistics