About Data Federation

config file $ORACLE_HOME/network/admin/cman.ora
you can get template from $ORACLE_HOME/network/admin/samples/cman.ora
and find log: $ORACLE_HOME/network/log/cman_nisco_li_alert.log  
Example:
cman_abc.cn.ibm.com=
(configuration=
  (address=(protocol=tcp)(host=abc.cn.ibm.com)(port=1630)) 
  (rule_list=
    (rule=
       (src=*)(dst=*)(srv=*)(act=accept)
       (action_list=(aut=off)(moct=0)(mct=0)(mit=0)(conn_stats=on))
     )
     (rule=
       (src=abc)(dst=127.0.0.1)(srv=cmon)(act=accept)
      )
  )
)
Note:
1. address: please set oracle server's hostname and port number for CMAN, default is 1630.
2. rule_list and parameter_list: these are some connection rules and parameters, you can get detail info from samples
   $ORACLE_HOME/network/admin/samples/cman.ora.
3) Run CMAN using cmctl
[oracle@abc bin]$ cmctl
CMCTL for Linux: Version 11.1.0.6.0 - Production on 04-FEB-2013 13:38:38
Copyright (c) 1996, 2007, Oracle.  All rights reserved.
Welcome to CMCTL, type "help" for information.
CMCTL> help
The following operations are available
An asterisk (*) denotes a modifier or extended command:

administer      close*          exit            quit
reload          resume*         save_passwd     set*
show*           shutdown        sleep           startup
suspend*

You can use administer to start CMAN.
4) Connect to oracle using CMAN
Config oracle client $ORACLE_HOME/network/admin/tnsnames.ora
Example:
PAWCMAN =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = abc.cn.ibm.com)(PORT = 1630))
    (ADDRESS = (PROTOCOL = TCP)(HOST = abc.cn.ibm.com)(PORT = 1521))
    (SOURCE_ROUTE = yes)  
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orapawpa)
    )
  )
Note:
5) IFS connect to Oracle server using CMAN
Take AIX script for example:
4. Then you can create other federated objects like nickname