LAG bundles all of the controller’s distribution system ports into a single port channel.
LAG requires the EtherChannel to be configured for 'mode on' on both the controller and the Catalyst switch.
https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/m_configuring_link_aggregation.html
B is correct
https://www.firewall.cx/cisco-technical-knowledgebase/cisco-wireless/1223-how-to-configure-wlc-lag-and-port-channel-with-nexus-catalyst-switches.html#:~:text=switchport%20mode%20trunk-,channel%2Dgroup%201%20mode%20on,-!%0Ainterface%20GigabitEthernet0
For anyone not wanting to search through this article, I believe the reasoning is:
"Notice that the channel-group mode is set to on which enables Etherchannel without any LACP or PAgP support. This is because the WLC doesn’t support LACP or PAgP and requires a plain vanilla Etherchannel."
In support of the claim above from cisco source.
"Once the EtherChannel is configured as on at both ends of the link, the Catalyst switch should not be configured for either Link Aggregation Control Protocol (LACP) or Cisco proprietary Port Aggregation Protocol (PAgP) but be set unconditionally to LAG. Because no channel negotiation is done between the controller and the switch, the controller does not answer to negotiation frames and the LAG is not formed if a dynamic form of LAG is set on the switch. Additionally, LACP and PAgP are not supported on the controller."
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#ID1514
upvoted 13 times
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