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User Guide 594
Configuring DHCP Service Configuration Examples
The network topology designed by the administrator is shown below.
Figure 5-19 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
5.3.2 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.
3) Configure DHCP VLAN Relay on the DHCP relay agent. Enable DHCP Relay globally,
choose the VLAN interface 1 (the default management VLAN interface) as the default
relay agent interface, and specify the DHCP server address for VLAN 10 and VLAN 20.
In this example, the DHCP server is demonstrated with T1600G-52TS and the DHCP relay
agent is demonstrated with T1600G-28TS. The following sections provide configuration
procedures in two ways: using the GUI and using the CLI.
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