During an AP Stateful Switchover (SSO), all the AP sessions statefully switch over and all the clients are deauthenticated and reassociated with the new active controller except for the locally switched clients in the FlexConnect mode.
For more details, please refer: http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-6/configuration-guide/b_cg76/b_cg76_chapter_01110000.html
The AP waits for the heartbeat time set, which is 30 seconds by default, to detect the failure of the primary WLC. After this period of time, the AP sends heartbeat messages seven more times, one per second, in efforts to find the primary WLC. If the AP does not hear from the primary WLC, the AP registers to an available WLC via the default process. Therefore, the process to detect the primary WLC failure and register to the secondary WLC takes approximately 80 seconds. Once the access point joins the secondary controller, it continues to send the discovery request to the primary controller in order to determine if the primary controller is back in operation. This can be determined with the help of the debug lwapp client packet command.
Note: The heartbeat message is similar to a keepalive message. The AP heartbeat is set to 30 seconds by default. You can adjust this heartbeat time, down to 1 second. However, if you have not made this adjustment since the last time that the AP heard from the WLC, 30 seconds pass before the AP realizes that it cannot reach the WLC.
Thanks guys, I was however looking for a specific answer. If the secondary controller doesn't have the same ap group and flex connect group as the first controller, does the ap inherit a new config or continues to use it's config that was pushed by the first controller? Do both controller have to have identical configs? Cheers. Serge.
Thanks guys, I was however looking for a specific answer.
If the secondary controller doesn't have the same ap group and flex connect group as the first controller, does the ap inherit a new config or continues to use it's config that was pushed by the first controller?
Do both controller have to have identical configs?
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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