You can configure an access point to have a preference, in order, for up to 3 controllers. When the AP boots it will use these configured preferences to find a controller.
If you configure the AP's preferred Primary Controller as the local (regional) controller and the preferred Secondary Controller as the headquarters then when the regional controller is not available the AP will try to register to the headquarters controller.
You can configure this on an AP-by-AP basis, but this can be cumbersome and slow. If you have WCS or NCS, then you can use AP Templates to apply these changes on a site-by-site basis (by selecting multiple APs at a time), which will save you a lot of time.
Here is a screenshot for doing this manually on each AP:
Choose the Wireless tab on the top menu bar
Choose All APs under Access Points in the left nav window
Select the AP to be modified
Choose the High Availability tab
Enter your Primary and Secondary controller Names and Management IP Addresses
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
This is the start of a display filter cross reference between Wireshark and OmniPeek.
The 1st installment is a table of advanced filters. More filters will be added as time allows.
It is a living doc, so check back for changes every so often
Please feel ...
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.
Powershell SNMP Module (Install-Module -Name SNMP)
SNMP Write Access to...