LACP Configuration

  • We have learned LACP and Link Aggregation before detailly and in this article we will focus LACP Cisco Configuration. We will make a link aggregation protocol with two ports in one bundle. You can use more port up to 8 ports in Cisco devices.


    Link aggregation Example Topology on Cisco
    Link Aggregation on Cisco Devices
    In our LACP Cisco Configuration example, we will use the G1/0/0 and the G2/0/0 ports to configure link aggregation. The basic configuration steps are below.



    On RouterA

    RouterA> enable
    RouterA# configure terminal
    RouterA (config)# interface port-channel 1
    RouterA (config-if)# lacp max-bundle 2
    RouterA (config-if)# ip address
    RouterA (config-if)# interface g1/0/0
    RouterA (config-if)# no ip address
    RouterA (config-if)# channel-group 1 mode active
    RouterA (config-if)# exit
    RouterA (config)# interface g2/0/0
    RouterA (config-if)# no ip address
    RouterA (config-if)# channel-group 1 mode active
    RouterA (config-if)# end





    On RouterB

    RouterB > enable
    RouterB # configure terminal
    RouterB (config)# interface port-channel 1
    RouterB (config-if)# lacp max-bundle 2
    RouterB (config-if)# ip address
    RouterB (config-if)# interface g1/0/0
    RouterB (config-if)# no ip address
    RouterB (config-if)# channel-group 1 mode passive
    RouterB (config-if)# exit
    RouterB (config)# interface g2/0/0
    RouterB (config-if)# no ip address
    RouterB (config-if)# channel-group 1 mode passive
    RouterB (config-if)# end




    Beside the basic steps, we can also configure a different parameter used with LACP in this LACP Cisco Configuration example. This parameter is LACP interface priority. When there are more member interfaces than the maximum allowed interface, master switch uses LACP interface priority to choose which member interfaces are Activein a port channel. Here, a port with a lower priority number is preferred.



    Here we do it for only RouterA, you can also use this command on the other end.


    RouterA > enable
    RouterA # configure terminal
    RouterA (config)# lacp system-priority 11111
    RouterA (config)# interface g1/0/0
    RouterA (config-if)# lacp port-priority 100
    RouterA (config-if)# exit
    RouterA (config)# interface g2/0/0
    RouterA (config-if)# lacp port-priority 200
    RouterA (config-if)# end




    To remove a port channel from a port you can use the below configuration:


    You can also view the below LACP Configuration Lessons for different vendors:

Lesson tags: LAG, Link Aggregation, LACP
Back to: CCIE Enterprise Infrastructure > Link Aggregation

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