Configuring a Layer 3 static aggregation group


You must be in the global configuration context: switch(config)#

  1. Create a Layer 3 aggregate interface and access the Layer 3 aggregate interface view by entering:
    switch(config)# interface lag <ID>

    The range of the LAG interface ID is 1 to 256.

    While creating the Layer 3 aggregate interface, the system automatically creates a Layer 3 static aggregation group numbered the same.

  2. Set the operational state of every interface in the LAG to up by entering:
    switch(config-lag-if)# no shutdown
    This command does not impact the administrative state of the member interfaces because the command was entered at the level of the LAG. To change the administrative state of a member interface, enter the command at the interface level. For example:
    switch(config)# interface lag 100
    switch(config-if)# no shutdown
  3. Set the IP address on the LAG interface by entering:
    switch(config-lag-if)# ip address <IPV4-ADDR>/<MASK>

    For example:

    switch(config-lag-if)# ip address
  4. Use the following steps to add a maximum of eight interfaces to the LAG:
    1. To assign an interface to the LAG:
      switch(config-lag-if)# interface <PORT-ID>

      To assign a range of interfaces to a LAG:

      switch(config-lag-if)# interface <PORT-ID>-<PORT-ID>

      For example:

      switch(config-lag-if)# interface 1/1/1-1/1/4

      See the Command-Line Interface Guide for your switch and software version for more information about the interface <PORT-ID> command.

    2. Assign an ID to the LAG:
      switch(config-if)# lag <ID>

      For example:

      switch(config-if-<1/1/1-1/1/4>)# lag 100
    3. Set the administrative state of the member interface to up:
      switch(config-if-<1/1/1-1/1/4>)# no shutdown
  5. View the configuration by entering the following:
    switch(config-if-<1/1/1-1/1/4>)# show running-config  
    Current configuration:
    vlan 1
    interface lag 100
        no shutdown
        ip address
    interface 1/1/1
        no shutdown
        lag 100
    interface 1/1/2
        no shutdown
        lag 100
    interface 1/1/3
        no shutdown
        lag 100
    interface 1/1/4
        no shutdown
        lag 100
    switch(config-if-<1/1/1-1/1/4>)# show lacp aggregates
    Aggregate name   : lag100
    Interfaces       : 1/1/3 1/1/1 1/1/4 1/1/2
    Heartbeat rate   : N/A
    Hash             : l3-src-dst
    Aggregate mode   : Off