Multi-Chassis Link Aggregation Group (MCLAG)

Multi-Chassis Link Aggregation Group (MCLAG) is a link aggregation technique where two or more links across two switches are aggregated together to form a trunk.

Configuration Commands

Create the MCLAG interface:

switch(config)# interface lag LAG multi-chassis
switch(config-lag-if)# no shutdown

Associate member links with the MCLAG interface:

switch(config)# interface IFACE
switch(config-if)# no shutdown switch(config-if)# lag LAG

Show commands to validate functionality:

show mclag <brief|configuration|status>

Example Output

switch(config)# interface lag 23 multi-chassis
switch(config-lag-if)# no shutdown
switch(config-lag-if)# exit
switch(config)# interface 1/1/10
switch(config-if)# no shutdown
switch(config-if)# lag 23
switch(config-if)# end

Expected Results

  1. Administrators can configure MCLAG
  2. Administrators can create an MCLAG interface
  3. Administrators can add ports to the MCLAG interface
  4. The output of the show commands is correct

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