H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 50)

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After the preceding configuration is complete, clients on networks 10.1.1.0/25 and 10.1.1.128/25 can
obtain IP addresses on the corresponding network and other network parameters from Switch A. You can
use the display dhcp server ip-in-use command on the DHCP server to view the IP addresses assigned to
the clients.
Self-defined option configuration example
Network requirements
As shown in Figure 18 , the DHCP client (Switch B) obtains an IP address and PXE server addresses from
the DHCP server (Switch A). The IP address belongs to subnet 10.1.1.0/24. The PXE server addresses are
1.2.3.4 and 2.2.2.2.
The DHCP server assigns PXE server addresses to DHCP clients through Option 43, a self-defined option.
The format of Option 43 and that of the PXE server address sub-option are shown in Figure 10 and Figure
12 , respectively. The value of Option 43 configured on the DHCP server in this example is 80 0B 00 00
02 01 02 03 04 02 02 02 02. The number 80 is the value of the sub-option type. The number 0B is the
value of the sub-option length. The numbers 00 00 are the value of the PXE server type. The number 02
indicates the number of servers. The numbers 01 02 03 04 02 02 02 02 indicate that the PXE server
addresses are 1.2.3.4 and 2.2.2.2.
Figure 18 Network diagram for self-defined option configuration
Configuration procedure
1. Specify IP addresses for the interfaces (omitted).
2. Configure the DHCP server
# Enable DHCP.
<SwitchA> system-view
[SwitchA] dhcp enable
# Configure DHCP address pool 0.
[SwitchA] dhcp server ip-pool 0
[SwitchA-dhcp-pool-0] network 10.1.1.0 mask 255.255.255.0
[SwitchA-dhcp-pool-0] option 43 hex 80 0B 00 00 02 01 02 03 04 02 02 02 02
3. Verification
After the preceding configuration is complete, Switch B can obtain its IP address on 10.1.1.0/24 and PXE
server addresses from the Switch A. You can use the display dhcp server ip-in-use command on the
DHCP server to view the IP addresses assigned to the clients.
Troubleshooting DHCP server configuration
Symptom
A client’s IP address obtained from the DHCP server conflicts with another IP address.