Overview:
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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