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Procedure
# Create DHCP address pool aa.
<SwitchA> system-view
[SwitchA] dhcp server ip-pool aa
# Specify the primary subnet and the gateway address for dynamic allocation.
[SwitchA-dhcp-pool-aa] network 10.1.1.0 mask 255.255.255.0
[SwitchA-dhcp-pool-aa] gateway-list 10.1.1.254
# Specify the secondary subnet and the gateway address for dynamic allocation.
[SwitchA-dhcp-pool-aa] network 10.1.2.0 mask 255.255.255.0 secondary
[SwitchA-dhcp-pool-aa-secondary] gateway-list 10.1.2.254
[SwitchA-dhcp-pool-aa-secondary] quit
[SwitchA-dhcp-pool-aa] quit
# Enable DHCP.
[SwitchA] dhcp enable
# Configure the primary and secondary IP addresses of VLAN-interface 10.
[SwitchA] interface vlan-interface 10
[SwitchA-Vlan-interface10] ip address 10.1.1.1 24
[SwitchA-Vlan-interface10] ip address 10.1.2.1 24 sub
# Enable the DHCP server on VLAN-interface 10.
[SwitchA-Vlan-interface10] dhcp select server
[SwitchA-Vlan-interface10] quit
Verifying the configuration
# Verify that the DHCP server assigns clients IP addresses and gateway address from the secondary
subnet when no address is available from the primary subnet. (Details not shown.)
# Display the primary and secondary subnet IP addresses the DHCP server has assigned. The
following is part of the command output.
[SwitchA] display dhcp server ip-in-use
IP address Client identifier/ Lease expiration Type
Hardware address
10.1.1.2 0031-3865-392e-6262- Jan 14 22:25:03 2015 Auto(C)
3363-2e30-3230-352d-
4745-302f-30
10.1.2.2 3030-3030-2e30-3030- Jan 14 22:25:03 2015 Auto(C)
662e-3030-3033-2d45-
7568-6572-1e
Example: Customizing DHCP option
Network configuration
As shown in Figure 22, DHCP clients obtain IP addresses and PXE server addresses from the DHCP
server (Switch A). The subnet for address allocation is 10.1.1.0/24.
Configure the address allocation scheme as follows:
Assign PXE addresses To clients
2.3.4.5 and 3.3.3.3
The hardware address in the request is six bytes long and
begins with
aabb-aabb
.
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