3Com 5500 SI - Switch - Stackable, Configuration Manual

Page: 144 / 686

144 C
HAPTER
10: DHCP S
ERVER
C
ONFIGURATION
DHCP Server
Displaying and
Debugging
You can verify your DHCP-related configuration by executing the display command in
any view.
To clear the information about DHCP servers, execute the reset command 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.
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. Note that DHCP 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 segment: 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 132 Display and debug a DHCP server
Operation Command
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 }
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