User Guide 414
Configuring DHCP Service Configuration Examples
4
Configuration Examples
4.1 Example for DHCP VLAN Relay
4.1.1 Network Requirements
The administrator needs to deploy the office network for the Marketing department and
the R&D department. The detailed requirements are listed below:
■ The Marketing department and the R&D department belong to VLAN 10 and VLAN 20,
respectively. Both of the VLANs have no Layer 3 gateways.
■ Computers in the two departments need to obtain IP addresses from the same DHCP
server.
The network topology designed by the administrator is shown below.
Figure 4-1 Network Topology for DHCP VLAN Relay
DHCP Server
192.168.0.59/24
VLAN 20VLAN 10
Marketing Dept. R&D Dept.
DHCP Relay Agent
192.168.0.1
Gi1/0/1
Gi1/0/2
4.1.2 Configuration Scheme
In the given situation, the DHCP server and the computers are isolated by VLANs, so
the DHCP request from the clients cannot be directly forwarded to the DHCP server.
Considering that the two VLANs have no Layer 3 gateways, we recommend you to
configure DHCP VLAN Relay to satisfy the requirement.
The overview of the configurations are as follows:
1) Create one DHCP IP pool on the DHCP server, which is on 192.168.0.0/24 network
segment.
2) Configure 802.1Q VLAN on the DHCP relay agent. Add all computers in the marketing
department to VLAN 10, and add all computers in the R&D department to VLAN 20.
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