CCNA 2.9: Configure, verify, and troubleshoot (Layer 2/Layer 3) EtherChannel


EtherChannel is a way of combining multiple ports into a single one.  Layer 2 EtherChannel combines multiple physical switchports whereas Layer 3 EtherChannel combines multiple logical interfaces such as subinterfaces.


Study Notes:

  • There are 3 options when configuring Port-Channels:
  • The first step is to create a port-channel
  • The next step is to assign the port-channel to an interface using the channel-group command
  • When assigning a channel-group on an interface, you have a few options
    • 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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