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MPLS was Stuck sometimes or new router joins into this backbone.

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  • 1.  MPLS was Stuck sometimes or new router joins into this backbone.

    Posted 08-17-2020 20:03
      |   view attached

    Hi,

     

    Sometimes, my backbone will be suck and need to reboot RE.

    Or when I add new router into my backbone. It will be stuck again.

     

    While this issue happens, first, I can't ping 8.8.8.8 by certain IP of this new router, but some IP can.

    MPLS label exists normally. 

    Then adjacent router's rpd will be crashed and need to reboot.

     

    I just think is it possible that MTU causes my connection of MPLS/LDP/RSVP crashed?

    My simple structure is like below this picture. and I also attached the configuration of MPLS/LDP/RSVP.

    Screen Shot 2020-08-18 at 10.59.43 AM.png 


    #MPLS
    #LACP

    Attachment(s)

    rtf
    Configuration.rtf   2 K 1 version


  • 2.  RE: MPLS was Stuck sometimes or new router joins into this backbone.

    Posted 08-18-2020 02:13

    Hello,

     

    Your symptoms are consistent with scenario where full BGP table is redistributed into IGP, usually by human error.

    Please check Your IGP export policy and avoid very common "term BLAH then accept" - it will inject BGP table into Your IGP.

    HTH

    Thx

    Alex



  • 3.  RE: MPLS was Stuck sometimes or new router joins into this backbone.

    Posted 08-18-2020 02:36

    Hi,

     

    I did add export policy in IGP.  Sorry about forgetting to show you. 

     

    export EXPORT-TO-ISIS;

     

    > show configuration policy-options policy-statement EXPORT-TO-ISIS
    }
    term OSPF-TO-ISIS {
    from {
    protocol ospf;
    route-filter 10.28.0.0/24 upto /32;
    route-filter 10.28.100.0/24 upto /32;
    }
    then accept;
    }
    term ISIS-TO-ISIS {
    from protocol isis;
    then accept;

     

    So, should not be relevant with BGP routes injecting into IGP.  If yes, we should got many routes via IS-IS advertisement.

     

    Or LFA loop cause ? I did meet it while I took OSPF for IGP. But now I tool IS-IS as my IGP.

     

    Best regards,

    Cloud



  • 4.  RE: MPLS was Stuck sometimes or new router joins into this backbone.
    Best Answer

    Posted 09-03-2020 20:13

    Hi,

     

    I found the root cause.

     

    Some routers' protocol rsvp are not set with "interface all". 

    THat cause LDP has been enabled, but RSVP is not. After fixed all router's protocol RSVP, it works well.

     

    thanks