In local mode, an AP creates two CAPWAP tunnels to the WLC. One is for management, the other is data traffic. This behavior is known as "centrally switched" because the data traffic is switched(bridged) from the ap to the controller where it is then routed by some routing device.
Flex Connect also known as HREAP by the old timers, allows data traffic to be switched locally and not go back to the controller. It basically causes the AP to behave like an autonomous AP, but be managed by the WLC. In this mode, the AP can still function even if it looses connection with the controller. Also, anytime you want to switch traffic locally, that would be the time to use Flex Connect. I used it once when my users were needing the wireless and wired networks to be on the same subnet for broadcasting reasons.
This is how I made it simple to myself, AP in local mode is nothing more than antenna (smart antenna - not to be harsh here)
Flexconnect mode is the combination between autonomous IOS APs and the local mode, Cisco made this mode basically for WAN connections where the link is usually less stable than LAN. So they offered two options:
- Make it exactly like local mode AP (all the traffic must reach the WLC in the link) == Central switching
- Make it use the WLC for management and the AP will be smart enough to manager the "data" traffic in the site == local switching
What is the difference in terms of functionality between (1) running an AP in local mode and (2) running FlexConnect mode and with all VLANs and WLANs/SSIDs centrally switched?
Nothing .. some controller like the virtual controller require the AP to be in flex mode. Functionality wise, it will be the same if the WLC is unreachable all the traffic stops.
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
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