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User Guide 546
Configuring DHCP Service DHCP
1
DHCP
1.1 Overview
DHCP (Dynamic Host Configuration Protocol) is widely used to automatically assign IP
addresses and other network configuration parameters to network devices, enhancing the
utilization of IP address.
1.2 Supported Features
The supported DHCP features of the switch include DHCP Server, DHCP Relay and DHCP
L2 Relay.
DHCP Server
DHCP Server is used to dynamically assign IP addresses, default gateway and other
parameters to DHCP clients. As the following figure shows, the switch acts as a DHCP
server and assigns IP addresses to the clients.
Figure 1-1 Application Scenario of DHCP Server
DHCP Clients
Switch
DHCP Server
DHCP Relay
DHCP Relay is used to process and forward DHCP packets between different subnets or
VLANs.
DHCP clients broadcast DHCP request packets to require for IP addresses. Without this
function, clients cannot obtain IP addresses from a DHCP server in the different LAN
because the broadcast packets can be transmitted only in the same LAN. To equip each
LAN with a DHCP server can solve this problem, but the costs of network construction will
be increased and the management of central network will become inconvenient.
A device with DHCP Relay function is a better choice. It acts as a relay agent and can
forward DHCP packets between DHCP clients and DHCP servers in different LANs.
Therefore, DHCP clients in different LANs can share one DHCP server.
DHCP Relay includes three features: Option 82, DHCP Interface Relay and DHCP VLAN
Relay.
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