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.  BGP ECMP using eBGP and iBGP peers

    Posted 05-23-2024 03:23

    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 05-23-2024 12:33

    Hi,

    there is a CLI knob "vpn-unequal-cost" (https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/vpn-unequal-cost-edit-routing-options.html), however it's for a VRF scenario so it would need some changes in your topology, and you need to understand if it's worthy.

    br.,

    Eduardo Haro



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    Eduardo Haro
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    Original Message