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LAG vs LACP with Linux

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  • 1.  LAG vs LACP with Linux

    Posted 02-04-2020 22:07

    Switch: EX4300


    My goal is to team 2xGigE interfaces to be able to get 2Gbps peak throughput between Switch and Linux server.


    Configurations is straight-forward:


    ge-0/0/1 {
     ether-options {
      802.3ad ae1;

    ge-0/0/21 {
     ether-options {
      802.3ad ae1;




    ae1 {
     aggregated-ether-options {
      lacp {
       periodic fast;
     unit 0 {
      family ethernet-switching {
       vlan {
        members VLAN1039;




    My challenge: I want to make it possible for Linux machine to periodically run without LACP and still have connectivity. 


    To clarify, when I only configure LAG on Juniper (no LACP on Server), everything works.

    Once I enable LACP on Juniper (but not on Linux server) then ae1 interface goes down *until I enable LACP on Linux server*.


    My goal is to be able to boot Linux server without LACP and still have connectivity (i.e. make LACP "optional").


    Appreciate any suggestions.

  • 2.  RE: LAG vs LACP with Linux
    Best Answer

    Posted 02-04-2020 22:12

    I would think lacp force-up option should work





    This will not need the lacp to be configured on the server and still the lacp will remain up locally on the Juniper end.

  • 3.  RE: LAG vs LACP with Linux

    Posted 02-04-2020 22:17

    Thank you for the great pointer, I got it working with your help!