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?
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https://community.cisco.com/t5/wireless-mobility-documents/lag-link-aggregation/ta-p/3128669To increase total throughput and redundancy on the links between the wireless controller and switch, the customer enabled Link Aggregation Control Protocol (LACP) on the wireless controller. In order for the wireless controller to connect to the switch, an EtherChannel must be configured on the switch.
An EtherChannel is a technology that allows multiple physical links between two devices to be combined into a single logical link, providing increased bandwidth and redundancy. There are several EtherChannel modes, but the two most commonly used are Active and Passive.
In Active mode, the switch actively initiates the negotiation process with the connected device to form an EtherChannel. In Passive mode, the connected device initiates the negotiation process. Both modes support LACP, but Passive mode is typically used when connecting to devices that do not support LACP.
In this scenario, the WLC is using LACP, which means that the switch must also use LACP to form the EtherChannel. Therefore, the correct EtherChannel mode to configure on the switch is Passive.
The On mode is another EtherChannel mode that does not use any negotiation protocol and simply bundles the physical links into a logical link. This mode is typically used when connecting to devices that do not support EtherChannel or LACP.
The Auto mode allows the switch to automatically detect whether the connected device supports EtherChannel and which mode it uses. If the connected device supports LACP, the switch will use LACP to form the EtherChannel. If the connected device does not support LACP, the switch will use the On mode. However, in this scenario, since the WLC is using LACP, the Auto mode is not a suitable choice.
Therefore, the correct EtherChannel mode to configure on the switch to allow the WLC to connect is Passive.