LACP Configuration #

EtherChannel Modes Relation #

✘: EtherChannel would not be set up.
⚠: Dangerous (EtherChannel will be set up on ONLY ONE side).

Setting LACP System Priority #

Switch(config)# lacp system-priority <priority_value>

Setting LACP Port Priority #

Switch(config)# int <interface>
Switch(config-if)# lacp port-priority <priority_value>

Setting Load Balance Method #

Switch(config)# port-channel load-balance <method>

method:
   src-port       Source port number
   dst-port       Destination port number
   src-dst-port*  Source and destination port number
   src-ip         Source IP address
   dst-ip         Destination IP address
   src-dst-ip*    Source and destination IP address
   src-mac        Source MAC address
   dst-mac        Destination MAC address
   src-dst-mac*   Source and destination MAC address
* XOR of two values

Assign Physical Interfaces #

Switch(config)# int <interface>
Switch(config-if)# channel-group <channel_num> mode <channel_mode>
Switch(config-if)# channel-protocol {lacp | pagp}

channel_mode:
  desirable  Enable PAgP unconditionally
  auto       Enable PAgP only if a PAgP device is detected
  active     Enable LACP unconditionally
  passive    Enable LACP only if an LACP device is detected
  on         Enable Etherchannel only

Config Guidelines #

Individual interface config does not affect the port-channel interface.

• Change EtherChannel setting after creation

  Switch(config)# interface port-channel <channel_num>
  Switch(config-if)# switchport mode trunk
  Switch(config-if)# switchport trunk allowed vlan <vlan_list>
  

• Avoiding misconfiguration with EtherChannel

  Switch(config)# spanning-tree etherchannel guard misconfig (Enabled by default)
  

Verify EtherChannel Configuration #

Switch# show interfaces port-channel <identifier>
Switch# show etherchannel summary
Switch# show etherchannel port-channel
Switch# show interfaces <interface> etherchannel