PLANET WGSW-52040 - Manual (Page 254)

DHCP server and the DHCP client are not in the same network, the server will not receive the
DHCP broadcast packets sent by the client, therefore no DHCP packets will be sent to the
client by the server. In this case, a DHCP relay is required to forward such DHCP packets so
that the DHCP packets exchange can be completed between the DHCP client and server.
Switch can act as both a DHCP server and a DHCP relay. DHCP server supports not only
dynamic IP address assignment, but also manual IP address binding (i.e. specify a specific IP
address to a specified MAC address or specified device ID over a long period. The differences
and relations between dynamic IP address allocation and manual IP address binding are: 1) IP
address obtained dynamically can be different every time; manually bound IP address will be
the same all the time. 2) The lease period of IP address obtained dynamically is the same as
the lease period of the address pool, and is limited; the lease of manually bound IP address is
theoretically endless. 3) Dynamically allocated address cannot be bound manually. 4)
Dynamic DHCP address pool can inherit the network configuration parameters of the dynamic
DHCP address pool of the related segment.
31.2 DHCP Server Configuration
DHCP Sever Configuration Task List:
1. Enable/Disable DHCP service
2. Configure DHCP Address pool
(1) Create/Delete DHCP Address pool
(2) Configure DHCP address pool parameters
(3) Configure manual DHCP address pool parameters
3. Enable logging for address conflicts
1. Enable/Disable DHCP service
Command Explanation
Global Mode
service dhcp
no service dhcp
Enable DHCP server. The no command
disables DHCP server.
Port Mode
ip dhcp disbale
no ip dhcp disable
The port disables DHCP services, the no
command enables DHCP services.
2. Configure DHCP Address pool
(1) Create/Delete DHCP Address pool
31-33