Displaying And Maintaining The Dhcp Server; Dhcp Server Configuration Examples; Dhcp Server Configuration Example - 3Com E4500-24 Cli Configuration Manual

Displaying and Maintaining the DHCP Server

To do...
Display the statistics on IP
address conflicts
Display lease expiration
information
Display the free IP addresses
Display information about
address binding
Display the statistics on a
DHCP server
Display information about
DHCP address pool tree
Clear IP address conflict
statistics
Clear dynamic address binding
information
Clear the statistics on a DHCP
server
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 Examples

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.

DHCP Server Configuration Example

Network requirements
The DHCP server (Switch A) assigns IP address to clients in subnet 10.1.1.0/24, which is
subnetted into 10.1.1.0/25 and 10.1.1.128/25.
Use the command...
display dhcp server conflict { all | ip
ip-address }
display dhcp server expired { ip ip-address |
pool [ pool-name ] | interface [ interface-type
interface-number ] | all }
display dhcp server free-ip
display dhcp server ip-in-use { ip ip-address |
pool [ pool-name ] | interface [ interface-type
interface-number ] | all }
display dhcp server statistics
display dhcp server tree { pool [ pool-name ] |
interface [ interface-type interface-number ] |
all }
reset dhcp server conflict { all | ip ip-address }
reset dhcp server ip-in-use { ip ip-address |
pool [ pool-name ] | interface [ interface-type
interface-number ] | all }
reset dhcp server statistics
2-27
Remarks
Available in
any view
Available in
user view