Router(dhcp-config)#?
DHCP pool configuration commands:
  bootfile             Boot file name
  client-identifier    Client identifier
  client-name          Client name
  default-router       Default routers
  dns-server           DNS servers
  domain-name          Domain name
  exit                 Exit from DHCP pool configuration mode
  hardware-address     Client hardware address
  host                 Client IP address and mask
  import               Programatically importing DHCP option parameters
  lease                Address lease time
  netbios-name-server  NetBIOS (WINS) name servers
  netbios-node-type    NetBIOS node type
  network              Network number and mask
  next-server          Next server in boot process
  no                   Negate a command or set its defaults
  option               Raw DHCP options

!
hostname R_A
!
ip dhcp excluded-address 192.168.1.1
!
ip dhcp pool dhcppool
   network 192.168.1.0 255.255.255.0
   default-router 192.168.1.1
!
interface FastEthernet0/0
 ip address 192.168.2.2 255.255.255.0
!