What is AP behavior when 5500 controller goes down?
This could really become a multi-part question as it depends on the "mode" of the AP, and the security method in place (for FlexConnect).
So, for the sake of simplicity, assuming these are "Local Mode" APs
1. If the "WLC" goes down; powers off; blows up; or otherwise becomes unreachable by the AP, clients would "immediately" stop passing traffic. Now, they would "pass" traffic to the AP, who will try to forward upstream via the CAPWAP tunnel; however it wouldn't make it anywhere.
2. The APs will be generating DTLS keep-alives (hearbeat) with a default of every 30 seconds towards the WLC. If the hearbeat is not responded to, the AP will re-transmit, until it reaches it's maximum retries for the DTLS heartbeat. At this point in time the AP will force a close of the DTLS connection and fall back to discovery, where-by it will follow the usual presedence for discovery/join.
So, as far as what happens to the "client". If the WLC went down, client's would not be getting anything done as soon as that happened. Now, the clients may still "think" they are connected; and it will not be until the AP tears down the DTLS connection for the client to not be associated to the AP, nor see any WLANs.
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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I have created a Powershell script to automatically add a Wireless Guest
User on Cisco WLCs. (tested on 2500 Series) The script should be
completely self explanatory. Prerequisites: Powershell SNMP Module
(Install-Module -Name SNMP) SNMP Write Access to y...