Which EtherChannel mode must be set for LAG on a Cisco WLC?
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Correct answer: on.
Why this is the answer
For EtherChannel on a Cisco Wireless LAN Controller (WLC) to function as a Link Aggregation Group (LAG), the EtherChannel mode on the connected switch ports must be set to "on." This is because the WLC itself does not participate in LACP (Link Aggregation Control Protocol) or PAgP (Port Aggregation Protocol) negotiation. It expects the EtherChannel to be statically configured. "Passive" and "active" are LACP modes. "Passive" waits for an active LACP partner, and "active" actively initiates LACP negotiation. "Auto" is a PAgP mode that waits for a PAgP partner. Since the WLC does not support these protocols, these modes would prevent the EtherChannel from forming correctly with the WLC.
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