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DHCP configuration example without DHCP relay agent
Network requirements
The DHCP server (Router A) assigns IP addresses to clients on subnet 10.1.1.0/24, which is subnetted into
10 .1.1. 0 / 25 a n d 10 .1.1.128 / 2 5 .
The IP addresses of Ethernet 0/1 and Ethernet 0/2 on Router A are 10.1.1.1/25 and 10.1.1.129/25
respectively.
In subnet 10.1.1.0/25, the lease is ten days and twelve hours, the domain name suffix is aabbcc.com, the
DNS server address is 10.1.1.2/25, and the gateway address is 10.1.1.126/25.
In subnet 10.1.1.128/25, the lease is five days, the domain name suffix is aabbcc.com, the DNS server
address is 10.1.1.2/25, and the gateway address is 10.1.1.254/25.
Subnets 10.1.1.0/25 and 10.1.1.128/25 have the same domain name suffix and DNS server address.
Therefore, the domain name suffix and DNS server address must be configured only for subnet
10 .1.1. 0 / 24 . S u b n e t 10 .1.1. 0 / 2 5 a n d 10 .1.1.12 8 / 2 5 c a n i n h e r i t t h e c o n f i g u r a t i o n o f s u b n e t 10 .1.1. 0 / 2 4 .
Router B (DHCP client) obtains a static IP address, DNS server address, and gateway address from
Router A (DHCP server).
Figure 218 DHCP network without a DHCP relay agent
Configuring the DHCP server (Router A)
1. Specify IP addresses for interfaces (details not shown).
2. Enable DHCP:
a. Select Advanced > DHCP Setup from the navigation tree to enter the default DHCP Enable
page.
b. Select the Enable option in the DHCP field.
c. Click Apply.
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