Vishal: adding some more info on top of what Leo has metnioned:
DCA is an algorithm used to pick up the most appropriate channel for the AP. to decide most appropriate channel the WLC checks the neighbor RF channels for an AP and picks up the most appropriate one with the least noise and/or interference.
For DCA to work among different controllers you need to configure same RF group name under the controller config (from controller tab). APs should hear each other at least @ -80 dBm or; if RSSI is less than -80 dbM (-85 dBm for example) DCA is not going to work.
Here are some useful links describing all what you need to know about DCA, TPC and coverage hole detection (all of those are under Radio Resource Management [RRM]). you will enjoy them if you have sometime to read
DCA stands for Dynamic Channel Assignment. It's self-explanatory.
Let's go back to autonomous IOS/WAPs. Without using the WLC, the operator configures the channel each radio of each WAPs will operate on. With the WLC (and if DCA is enabled), the WLC will coordinate among the WAPs and change channels accordingly so you won't get channel interferrence.
Now there's another feature that you didn't ask and it's called the TPC or Transmit Power Control. Like the DCA, if it's enabled, the WLC will adjust the transmission of each radio of each WAP accordingly.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
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