An administrator is configuring an EtherChannel between two switches using a dynamic link aggregation protocol. The administrator wants the EtherChannel to form automatically, with both switches initiating the negotiation process. Which port mode configuration should the administrator use on the interfaces?
Configure both interfaces to use the "passive" port mode.
Configure one interface to "active" mode and the other to "passive" mode.
Configure both interfaces to use the "on" port mode.
Configure both interfaces to use the "active" port mode.
Configuring both interfaces to use the 'active' port mode ensures that both switches actively initiate LACP (Link Aggregation Control Protocol) negotiation, forming the EtherChannel automatically as desired. When both ends are set to 'active', they send LACP packets to each other, initiating and establishing the EtherChannel. If one end is 'active' and the other is 'passive', the EtherChannel will still form, but only the 'active' end initiates the negotiation, which doesn't meet the requirement of both switches initiating the process. If both ends are set to 'passive', neither switch initiates negotiation, and the EtherChannel will not form. Setting both ends to 'on' mode forces the channel without using LACP, which does not meet the requirement of using a dynamic protocol.
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Cisco CCNA 200-301
Network Access
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