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User Guide 606
Configuring DHCP Service Configuration Examples
5.5 Example for DHCP L2 Relay
5.5.1 Network Requirements
As the following figure shows, two groups of computers are connected to Switch A, and
Switch A is connected to the DHCP server. All devices on the network are in the default
VLAN 1. All computers get dynamic IP addresses from the DHCP server. For management
convenience, the administrator wants to allocate separate address spaces for the two
groups of computers.
Figure 5-32 Network Topology for DHCP L2 Relay
Gi1/0/2Gi1/0/1
Group 1 Group 2
DHCP Server
192.168.10.1/24
Switch A
DHCP Relay
00:00:FF:FF:27:12
192.168.10.100-192.168.10.150 192.168.10.151-192.168.10.200
PC PCPC PC
5.5.2 Configuration Scheme
To meet the requirements, you can configure DHCP L2 Relay on Switch A to inform the
DHCP server of the group information of each PC, so that the DHCP server can assign IP
addresses of different address pools to the PCs in different groups.
The overview of the configurations are as follows:
1) Configuring Switch A
a. Enable DHCP L2 Relay globally and on VLAN 1.
b. Configure Optionî™»82 on ports 1/0/1 and 1/0/2.
Demonstrated with T1600G-28TS, 5.5.3 Configuring the DHCP Relay Switch provides
configuration procedures in two ways: using the GUI and using the CLI.
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