Configuring the DHCP Server

Using the DHCP Pool configured on a IOS device is somewhat obsolete, but in cases of smaller companies where this solution is inevitable (or in a case such as mine, preparations for a CCIE exam) - you should know how to configure a full DSCP on a Cisco Router:

Step 1: Enable DHCP Server on a Device:
(config)#service dhcp

Step 2: Configure global DHCP options:
(config)#ip dhcp pool Cisco
(config-dhcp)#network 172.25.185.0 255.255.255.0 <- Network Range
(config-dhcp)#netbios-note-type h-node <- If you're using WINS, set the HYBRID TYPE
(config-dhcp)#netbios-name-server 172.25.185.253 <- WINS Server IP
(config-dhcp)#dns-server 172.25.185.200 172.25.185.201 <- Primary and Secondary IPs
(config-dhcp)#lease 3 5 <- The duration of the DHCP Lease (3 days 5 hours)

Step 3: Configure the IP Exclusions (IPs) you do not want to lease, in the Global Config mode:
(config)#ip dhcp excluded-address 172.25.185.252 172.25.185.254

Step 4: Disable the DSCP Logging of the Conflicts, because quite a few are likely to occur, and your log file can
fill in the memory:
(config)#no ip dhcp conflict logging

Step 5: Static DHCP entries must be configured IN A SEPARATE POOL!!! This is a trick that you need to know by heart because there is no other (more intuitive) way to do it. So - create another DHCP pool, and assign the hosts IP and the MAC address (THIS HOST WILL INHERIT THE CONFIG FROM THE DEFAULT POOL):
(dhcp-config)#host 10.184.117.37
(dhcp-config)#hardware-address 0014.2526.ef46

Check if your manual entry was configured:
#sh ip dhcp binding
Bindings from all pools not associated with VRF:
IP address          Client-ID/              Lease expiration        Type
                    Hardware address/
                    User name
10.184.117.37       0014.2526.ef46          Infinite                Manual