Reserver IP address via DHCP

I defined a pool of DHCP on IOS software, I want to reserve a IP address to host, I made it, only that doesn't assigned the IP address that I defined in the pool
Help? How I can to do it?
Example
ip dhcp pool guestimport all
network 172.23.12.0 255.255.255.0
default-router 172.23.12.254
address 172.23.12.231 hardware-address 0100.14c2.c6ec.42

Jorge,
First you have to create an IP dhcp pool for your clients, then for a fixed IP address create another IP dhcp pool.
Example, if your MAC is 12.34.12.34.12.34
ip dhcp pool Client1
host 172.23.12.200 255.255.255.0
client-identifier 0112.3412.3412.34
Release the IP and renew IP address and IP address 172.23.12.200 will be assign it.
Hope this helps.
Regards,
JC Arias

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      69666963 6174652D 31373535 33373233 3931301E 170D3132 31313137 30313130
      35325A17 0D323030 31303130 30303030 305A3031 312F302D 06035504 03132649
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      37323339 3130819F 300D0609 2A864886 F70D0101 01050003 818D0030 81890281
      8100D53F 9EB5B123 3103A4D5 82E786F7 F91C2DE5 9E409A22 80AF78F6 812F624A
      89FE9103 73C4AAAB 13FF880D F628607D 6888AC49 18BEDD77 778F0DB1 F9A796E9
      E92717CD 6DD19450 5066620A 91278C33 E38349EA 92B8C671 80761609 0AC46E6F
      2C8C6BCF ABC7E1F7 A64BD28C C85477FE B23F8A7C 555ECDF9 CE461B8D 6C017370
      0ED70203 010001A3 67306530 0F060355 1D130101 FF040530 030101FF 30120603
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      8181004A AFA4D07C 1424DE0E EF3F17F2 BB1EA63B CB17C13D 1AEA31A1 BAB6AF77
      DB6EA8A2 2117DCD1 5530A18C 3618D568 CC7EF520 E039ACBD DA906352 BB7E51BD
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