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Which EtherChannel mode must be configured on the switch to allow the WLC to connect?
To increase total throughput and redundancy on the links between the wireless controller and switch, the customer enabled LAG on the wireless controller.
Which EtherChannel mode must be configured on the switch to allow the WLC to connect?
A . Auto
B . Active
C . On
D . Passive
Answer: B
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Mode on, so the right answer is C :
The controller’s neighbor devices must also be properly configured to support LAG
Each neighbor port to which the controller is connected should be configured as follows:
interface GigabitEthernet
switchport
channel-group mode on
no shutdown
https://community.cisco.com/t5/wireless-mobility-documents/lag-link-aggregation/ta-p/3128669