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

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:
  • 2.9.a Static PortChannel
  • 2.9.b Port Aggregation Protocol (PaGP)
  • 2.9.c Link Aggregation Protocol (LACP)
• 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

Links:

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli_rel_4_0_1a/CLIConfigurationGuide/EtherChannel.html