CT2504 and Aironet 1142N configurations

Question

Hi All,
I have bought 2504 LAN Controller and my old 1142 wants to configure to accept that Controller instead of old controller. These APs and controllers in far away site and before I go there I want to figure out how can I do followings. Your help much more appreciated, Because Lack of my knowledge and experience in wireless.
1.   How can I configure old 1142(Previously connected with another LAN Controller) to accept New 2504 Controller instead of old controller ?
2.  What are the concerns do I need to consider?
3.  Is there any configuration example which can be understand easier to a beginner?  or any guide to guide me without much hassel?
Thanking you in advance
Chamara

Answer 1

A unified access point or a LAP would only keep the management address of all the wlc it has discovered previously by joining them, or though mobility configuration on them (mobility members on them).
As far as configuration is concerned, each time an lap joins a new or for that matter the same wlc it has previously joined,
it pulls the configuration/revision to it as an event/state as defined for CAPWAP state machine.
Here is the CAPWAP state machine for your reference,
                            |          /-------------------------\|
                            |         p|                         ||
                            |    q+----------+ r +------------+  ||
                            |     |   Run    |-->|   Reset    |-\||
                            |     +----------+   +------------+ |||
                           n|  o      ^           ^     ^      s|||
                +------------+--------/           |     |       |||
                | Data Check |             /-------/    |       |||
                +------------+<-------\   |             |       |||
                                      |   |             |       |||
                       /------------------+--------\    |       |||
                      f|             m|  h|    j   v   k|       |||
               +--------+     +-----------+     +--------------+|||
               |  Join  |---->| Configure |     |  Image Data  ||||
               +--------+  n  +-----------+     +--------------+|||
                ^   |g                 i|                    l| |||
                |   |                   \-------------------\ | |||
                |   \--------------------------------------\| | |||
                \------------------------\                 || | |||
         /--------------<----------------+---------------\ || | |||
         | /------------<----------------+-------------\ | || | |||
         | |  4                          |d           t| | vv v vvv
         | |   +----------------+   +--------------+   +-----------+
         | |   |   DTLS Setup   |   | DTLS Connect |-->|  DTLS TD  |
       /-|-|---+----------------+   +--------------+ e +-----------+
       | | |    |$  ^  ^   |5  ^6         ^              ^  |w
       v v v    |   |  |   |   \-------\  |              |  |
       | | |    |   |  |   \---------\ |  |  /-----------/  |
       | | |    |   |  \--\          | |  |  |              |
       | | |    |   |     |          | |  |  |              |
       | | |    v  3|  1  |%     #   v |  |a |b             v
       | | \->+------+-->+------+   +-----------+    +--------+
       | |    | Idle |   | Disc |   | Authorize |    |  Dead  |
       | |    +------+<--+------+   +-----------+    +--------+
       | |     ^   0^  2      |!
       | |     |    |         |   +-------+
      *| |u    |    \---------+---| Start |
       | |     |@             |   +-------+
       | \->+---------+<------/
       \--->| Sulking |
            +---------+&
Regards
Sahil