3Com Switch 8800 Advanced Software V5 Configuration Guide

732 CHAPTER 50: DHCP SERVER CONFIGURATION
Displaying and
Maintaining the DHCP
Server
n
Using the save command does not save DHCP server lease information. Therefore,
when the system boots up or the reset dhcp server ip-in-use command is
executed, no lease information will be available in the configuration file. In this
case, the server will deny the request for lease extension from a client and the
client needs to request an IP address again.
DHCP Server
Configuration
Example
DHCP networking involves two types:
■ The DHCP server and client are on the same subnet and exchange messages
directly.
■ The DHCP server and client are not on the same subnet and they communicate
with each other via a DHCP relay agent.
The DHCP server configuration for the two types is the same.
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.
■ The IP addresses of VLAN interfaces 1 and 2 on Switch A are 10.1.1.1/25 and
10.1.1.129/25 respectively.
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 { ip
ip-address | pool [ pool-name ] | all }
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 { ip
ip-address | pool [ pool-name ] | all }
Display information about
DHCP server statistics
display dhcp server statistics
Display information about
the address pool tree
organization
display dhcp server tree { pool [
pool-name ] | all }
Clear information about IP
address conflicts
reset dhcp server conflict { all | ip
ip-address }
Available in user view
Clear information about
dynamic bindings
reset dhcp server ip-in-use { ip
ip-address | pool [ pool-name ] | all }
Clear information about
DHCP server statistics
reset dhcp server statistics