EtherChannel

EtherChannel is the logical grouping multiple interfaces into a single logical interface (like the reverse of Trunk)
- However, it is more of a stickler than Trunking/DTP
There are three methods of configuration, and the modes cannot be mixed
- PAgP
  - #Cisco-Proprietary
  - desirable actively attempts to form an EtherChannel
    - Forms EtherChannel with either desirable or auto neighbors
  - auto does not actively attempt to form an EtherChannel
    - Only forms EtherChannel with desirable neighbors
- LACP
  - Industry standard (IEEE 802.3ad)
  - active actively attempts to form an EtherChannel
    - Forms EtherChannel with either active or passive neighbors
  - passive does not actively attempt to form an EtherChannel
    - Only forms Etherchannel with active neighbors
- Static (LAG)
  - on is the only configuration
    - Both sides must be on
      - Anything else results in a failed configuration
  - No Etherchannel negotiation
  - WLC's are only compatible with Static/LAG EtherChannel connections

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