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Assign IP addresses
10.10.1.2 to 10.10.1.10
10.10.1.11 to 10.10.1.26
Router B assigns the DNS server address 10.10.1.20/24 and the gateway address 10.10.1.254/24 to
clients on subnet 10.10.1.0/24.
Figure 34 Network diagram
Procedure
1.
Specify IP addresses for the interfaces on the DHCP server. (Details not shown.)
2.
Configure DHCP:
# Enable DHCP and configure the DHCP server to handle Option 82.
<RouterB> system-view
[RouterB] dhcp enable
[RouterB] dhcp server relay information enable
# Enable the DHCP server on the interface GigabitEthernet1/0/1.
[RouterB] interface gigabitethernet 1/0/1
[RouterB-GigabitEthernet1/0/1] dhcp select server
[RouterB-GigabitEthernet1/0/1] quit
# Create DHCP user class tt and configure a match rule to match DHCP requests that contain
Option 82.
[RouterB] dhcp class tt
[RouterB-dhcp-class-tt] if-match rule 1 option 82
[RouterB-dhcp-class-tt] quit
# Create DHCP user class ss and configure a match rule to match DHCP requests in which the
hardware address is six bytes long and begins with aabb-aabb-aab.
[RouterB] dhcp class ss
[RouterB-dhcp-class-ss] if-match rule 1 hardware-address aabb-aabb-aab0 mask
ffff-ffff-fff0
[RouterB-dhcp-class-ss] quit
# Create DHCP address pool aa.
[RouterB] dhcp server ip-pool aa
# Specify the subnet for dynamic allocation.
[RouterB-dhcp-pool-aa] network 10.10.1.0 mask 255.255.255.0
To clients
The DHCP request contains Option 82.
The hardware address in the request is six bytes long and
begins with aabb-aabb-aab.
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Troubleshooting
