H3C Technologies H3C S12500 Series Switches - Manual (Page 68)

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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 29 Network diagram
Configuration procedure
1. Specify IP addresses for the interfaces. (Details not shown.)
2. Configure the DHCP server:
# Enable DHCP.
<SwitchA> system-view
[SwitchA] dhcp enable
# Enable the DHCP server on VLAN-interface 2.
[SwitchA] interface vlan-interface 2
[SwitchA-Vlan-interface2] dhcp select server global-pool
[SwitchA-Vlan-interface2] quit
# 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
Verifying the configuration
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.
Analysis
A host on the subnet can have the same IP address.
Switch A
DHCP server
Switch B
DHCP client
Vlan-int2
10.1.1.1/24
Vlan-int2