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When configuring an EtherChannel bundle, which mode enables LACP only if a LACP device is detected?

When configuring an EtherChannel bundle, which mode enables LACP only if a LACP device is detected?

  • 1- SwitchFormula1(config-if-range)# channel-group 13 mode active
  • 2- SwitchFormula1(config-if-range)# channel-group 13 mode auto
  • 3- SwitchFormula1(config-if-range)# channel-group 13 mode on
  • 4- SwitchFormula1(config-if-range)# channel-group 13 mode passive



  • The correct answer is:

  • 4- SwitchFormula1(config-if-range)# channel-group 13 mode passive 
  • The LACP is Link Aggregation Control Protocol. LACP is an open protocol, published under the 802.3ad.
    The modes of LACP are active, passive or on. The side configured as “pasive” will waiting the other side that should an Active for the Etherchannel to be established.

    PAgP is Port-Aggregation Protocol. It is Cisco proprietary protocol. The mode are On, Desirable or Auto. Desirable – Auto will establish a EtherChannel.

    An example of how to configure an Etherchannel:
    SwitchFormula1>enable
    SwitchFormula1#configure terminal
    SwitchFormula1(config)# interface range f0/5 -14
    SwitchFormula1(config-if-range)# channel-group 13 mode ?
    active Enable LACP unconditionally
    auto Enable PAgP only if a PAgP device is detected
    desirable Enable PAgP unconditionally
    on Enable Etherchannel only
    passive Enable LACP only if a LACP device is detected

    .

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