Junos OS

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  • 1.  BGP ECMP using eBGP and iBGP peers

    Posted 29 days ago

    Hi,

    I'm using an MX204 with JunOS 22.2R3-S2.8 and I need to enable BGP load sharing on my crosslink which uses iBGP. 

    When I started lab testing I couldn't manage to do it, then I found this documentations which describes the "allow-external-internal" subcommand similar to Cisco's "eibgp", which I was using for long years. However I did not find such option on the MX under the "multipath" command and then I noticed a line in the documentations which says this feature is available from JunOS 23.4R1, which was a bit of a shock. 

    Is there no other way to use BGP ECMP with eBGP and iBGP peers? I have very limited possibilities for JunOS upgrade. 

     



  • 2.  RE: BGP ECMP using eBGP and iBGP peers

    Posted 29 days ago
    Edited by Kalle 29 days ago

    Hi Tamas,

    Use the following command to allow load sharing among multiple EBGP paths and multiple IBGP paths.
    set protocols bgp group BGP multipath
    https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/multipath-edit-protocols-bgp.html



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    Kalle Andersson
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  • 3.  RE: BGP ECMP using eBGP and iBGP peers

    Posted 29 days ago

    Hi,

    I believe it should work when you do load sharing with 2 eBGP peers, also it should work when you do load sharing with 2 iBGP peers, but does it work when you do load sharing with 1 iBGP and 1 eBGP peer?
    I tested in lab environment and it was not working for me with the simple "multipath" command.



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    TAMAS VARGA
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