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You can get the exact location of your rogue AP or rogue client using the Cisco Connected Mobile Experiences (CMX) or Cisco Spaces integration with Catalyst Center: https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and...
Adding to that, you can do a series of switchovers instead of a reload as a reload on the 9800 in HA will reload the whole stack.
redundancy force-switchover
This will reload the active and move the operations to standby and you can do this twice so...
To safely switchover, check the redundancy states as suggested in the other comment, see if standby is in "HOT-Standby" and then you can run the following command to switchover, this will reload the active WLC and perform a stateful switchover with m...
Hello @YK Lung Bang, so there is no formal migration as both of them run on the same configuration and OS -- IOS-XE, just that your EWC only supported Flex switching and now with a 9800 WLC you can choose to run Local or Flex depending on your deploy...
APSP10 just released a couple of days ago, so it will take sometime in general for the documentation to get updated, but you can check the "README" which is available on software.cisco.com for the fixed bugs -https://www.cisco.com/web/software/286325...