Using keys to control dynamic LACP trunk configuration

The lacp key option provides the ability to control dynamic trunk configuration. Ports with the same key will be aggregated as a single trunk.

There are two types of keys associated with each port, the Admin key and the Operational key. The Operational key is the key currently in use. The Admin key is used internally to modify the value of the Operational key. The Admin and Operational key are usually the same, but using static LACP can alter the Operational key during runtime, in which case the keys would differ.

The lacp key command configures both the Admin and Operational keys when using dynamic LACP trunks. It only configures the Admin key if the trunk is a static LACP trunk. It is executed in the interface context.

Syntax:

no lacp [active | passive | key <0-65535>]

Sets the LACP key. During dynamic link aggregation using LACP, ports with the same key are aggregated as a single trunk.

switch(config)# int A2-A3 lacp active
switch(config)# int A2-A3 lacp key 500

switch(config)# show lacp

                           LACP
       LACP    Trunk   Port            LACP    Admin  Oper
  Port Enabled Group   Status  Partner Status  Key    Key
  ---- ------- ------- ------- ------- ------- ------ ------
  A2   Active  A2      Down    No      Success 500    500
  A3   Active  A3      Down    No      Success 500    500

switch(config)# int A5 lacp active
switch(config)# int A5 lacp key 250

switch# show lacp
                           LACP
       LACP    Trunk   Port            LACP    Admin  Oper
  Port Enabled Group   Status  Partner Status  Key    Key
  ---- ------- ------- ------- ------- ------- ------ ------
  A1   Active  Dyn1    Up      Yes     Success 100    100
  A2   Active  Dyn1    Up      Yes     Success 100    100
  A3   Active  Dyn1    Up      Yes     Success 100    100
  A4   Active  Dyn1    Up      Yes     Success 100    100
  A5   Active  A5      Up      No      Success 250    250