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MC-LAG issue. Active - Standby. 2 MXes and 1 EX.

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  • 1.  MC-LAG issue. Active - Standby. 2 MXes and 1 EX.

    Posted 05-28-2019 02:38

    Hello,

     

    MX960 (dcr3.hors) xe-0/1/1 (ae100) <===> (ae0) xe-0/1/0 (dcx-test.hors) EX2300
    
    MX960 (dcr4.hors) xe-0/1/1 (ae100) <===> (ae0) xe-0/1/1 (dcx-test.hors) EX2300

     

    I have an MC-LAG issue which is manifesting this way:

    root@dcx-test.hors> show lacp interfaces ae0 extensive
    Aggregated interface: ae0
    LACP state: Role Exp Def Dist Col Syn Aggr Timeout Activity
    xe-0/1/1 Actor No Yes No No No Yes Fast Active
    xe-0/1/1 Partner No Yes No No No Yes Fast Passive
    xe-0/1/0 Actor No Yes No No No Yes Fast Active
    xe-0/1/0 Partner No Yes No No No Yes Fast Passive
    LACP protocol: Receive State Transmit State Mux State
    xe-0/1/1 Defaulted Fast periodic Detached
    xe-0/1/0 Defaulted Fast periodic Detached
    LACP info: Role System System Port Port Port
    priority identifier priority number key

    xe-0/1/1 Actor 127 b8:c2:53:0e:95:46 127 2 1
    xe-0/1/1 Partner 1 00:00:00:00:00:00 1 2 1
    xe-0/1/0 Actor 127 b8:c2:53:0e:95:46 127 1 1
    xe-0/1/0 Partner 1 00:00:00:00:00:00 1 1 1

     

    trf@dcr3.hors> show lacp interfaces ae100 extensive
    Aggregated interface: ae100
    LACP state: Role Exp Def Dist Col Syn Aggr Timeout Activity
    xe-0/1/1 Actor No No No No Yes Yes Fast Active
    xe-0/1/1 Partner No Yes No No No Yes Fast Active
    LACP protocol: Receive State Transmit State Mux State
    xe-0/1/1 Current Fast periodic Attached
    LACP info: Role System System Port Port Port
    priority identifier priority number key
    xe-0/1/1 Actor 127 00:00:00:00:00:01 200 18 100
    xe-0/1/1 Partner 127 b8:c2:53:0e:95:46 127 1 1

     

    trf@dcr4.hors> show lacp interfaces ae100 extensive
    Aggregated interface: ae100
    LACP state: Role Exp Def Dist Col Syn Aggr Timeout Activity
    xe-0/1/1 Actor No No No No No Yes Fast Active
    xe-0/1/1 Partner No Yes No No No Yes Fast Active
    LACP protocol: Receive State Transmit State Mux State
    xe-0/1/1 Current Fast periodic Waiting
    LACP info: Role System System Port Port Port
    priority identifier priority number key
    xe-0/1/1 Actor 127 00:00:00:00:00:01 100 32788 100
    xe-0/1/1 Partner 127 b8:c2:53:0e:95:46 127 2 1

     

    trf@dcr3.hors# run show interfaces mc-ae
    Member Link : ae100
    Current State Machine's State: mcae active state
    Local Status : active !!!!
    Local State : down <<<should be up>>>
    Peer Status : standby !!!!
    Peer State : down <<<should be up>>>


    trf@dcr4.hors# run show interfaces mc-ae
    Member Link : ae100
    Current State Machine's State: mcae standby state
    Local Status : standby !!!!
    Local State : down <<<should be up>>>
    Peer Status : active !!!!
    Peer State : down <<<should be up>>>.

     

    ICCP is UAR.

    Tested the config in a LAB, all works great.

    Where do i start to troublesoot ??

     



  • 2.  RE: MC-LAG issue. Active - Standby. 2 MXes and 1 EX.

     
    Posted 05-28-2019 06:25

    Is chassis aggregated-devices ethernet device-count set to >=101 on the MX's? You should post relevent configs for each of the three devices.



  • 3.  RE: MC-LAG issue. Active - Standby. 2 MXes and 1 EX.

     
    Posted 05-28-2019 11:24

    LACP is down on all 3 devices

     

    labroot@lab# run show lacp interfaces
    Aggregated interface: ae6
    LACP state: Role Exp Def Dist Col Syn Aggr Timeout Activity
    xe-0/0/1 Actor No No Yes Yes Yes Yes Fast Active
    xe-0/0/1 Partner No No Yes Yes Yes Yes Fast Active
    LACP protocol: Receive State Transmit State Mux State
    xe-0/0/1 Current Fast periodic Collecting distributing <<<<<<This is what is looks like when LACP is up 

     

    First of all, you should check if LACP can come back between one MX and one EX. Looks like in your case, you are not able to bring up the LACP even with one MX and on EX. After that, we can check ICCP/ICL and mc-ae. Please get ae100/ae0/iccp and other related configurations 



  • 4.  RE: MC-LAG issue. Active - Standby. 2 MXes and 1 EX.

    Posted 05-28-2019 13:56

    Hi there,

     

    agree with the last comments you need to ensure you are not just running into a LACP issue, and with the config you showed us is hard to tell.

     

    Check that first then you can use these commands should work on MX

     

    root@re0# set multi-chassis mc-lag consistency-check   

    after that run the consistency check:

     

     root@re0>run show multi-chassis mc-lag configuration-consistency

    hope it helps let us know ok

     

     



  • 5.  RE: MC-LAG issue. Active - Standby. 2 MXes and 1 EX.
    Best Answer

    Posted 05-29-2019 03:51

    Hello,

     

    The issue is comming from MX interfaces, i used another interfaces and everything came up.

    Thanks for help.