Which mode configuration setting would allow formation of an EtherChannel link between switches SW1 and SW2 without sending negotiation traffic?

Which mode configuration setting would allow formation of an EtherChannel link between switches SW1 and SW2 without sending negotiation traffic?

  • SW1: on
    SW2: on
  • SW1: desirable
    SW2: desirable
  • SW1: auto
    SW2: auto
    trunking enabled on both switches
  • SW1: auto
    SW2: auto
    PortFast enabled on both switches
  • SW1: passive
    SW2: active

    Answers Explanation & Hints:

    The auto channel-group keyword enables PAgP only if a PAgP device is detected on the opposite side of the link. If the auto keyword is used, the only way to form an EtherChannel link is if the opposite connected device is configured with the desirable keyword. PortFast and trunking technologies are irrelevant to forming an EtherChannel link. Even though an EtherChannel can be formed if both sides are configured in desirable mode, PAgP is active and PAgP messages are being sent constantly across the link, decreasing the amount of bandwidth available for user traffic.

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