Routing

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Ask questions and share experiences about ACX Series, CTP Series, MX Series, PTX Series, SSR Series, JRR Series, and all things routing, including portfolios and protocols.
  • 1.  Purpose of empty BGP update

    Posted 02-25-2024 01:23

    Hi everyone,

    I noticed sometime BGP speaker sent empty BGP update as shown below:

    We can see there is no NLRI, no BGP attributes, it is just plain empty.   What is the purpose of such update?

    Much appreciated!!



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    Be kind!!
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  • 2.  RE: Purpose of empty BGP update

    Posted 02-25-2024 06:16

    Hi,

    As far as I remember, BGP update messages can sometimes be used for keepalive.



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    FARID AKHUNDOV
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  • 3.  RE: Purpose of empty BGP update

    Posted 02-26-2024 19:29

    If my memory serves me correct ( which I highly doubt it) only if  BGP router has an update  to send and  at the same time it is time to send keep alive, then router suppresses  keepalive and sends BP update instead.  I have never seen empty BGP update so I was curious :)

    Appreciate your feedback and help Farid!.



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    Be kind!!
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  • 4.  RE: Purpose of empty BGP update

    Posted 02-26-2024 19:42

    At this moment your mention of empty BGP update might help me. Best way I found to make BGP roll is with virtual router and a vrf. That and export policy statement xxxxL:xxxx . But I'm not sure I want the BGP route present at all. I don't use BGP at all, at present.



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    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
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  • 5.  RE: Purpose of empty BGP update

    Posted 02-27-2024 05:45

    No worries.



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    FARID AKHUNDOV
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  • 6.  RE: Purpose of empty BGP update
    Best Answer

    Posted 03-07-2024 11:22

    https://datatracker.ietf.org/doc/html/rfc4724#section-2

    It's an End-of-RIB marker. A way to say «the last big batch of updates I had to send to you is now empty ; all future updates will be sent as they arise».



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    Olivier Benghozi
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