With LAG, all of the controller ports need to connect to the same neighbor switch. If the neighbor switch goes down, the controller loses connectivity.
With multiple AP-manager interfaces, you can connect your ports to different neighbor devices. If one of the neighbor switches goes down, the controller still has connectivity.
My opinion is
Multiple AP:
Avoids...
Complex...
LAG:
Simple...
Achieves...
You can't mix Simple and Complex.
Also "LAG simplifies controller configuration because you no longer require to configure primary and secondary ports for each interface"
Check following link: https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/b_cg74_CONSOLIDATED_chapter_010100001.html
Multiple AP-Manager Interfaces:
Complex configuration on the Cisco WLC and infrastructure
Achieves optimal AP join process with src-dst-ip load-balancing
LAG (Link Aggregation Group):
Simple configuration on the Cisco WLC and infrastructure
Avoids single point of failure on neighbor switches
This combination is not possible, because the Multiple AP-manager interfaces can not be complex and simple at the same time
upvoted 3 times
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