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"ecmp mode enhanced"

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  • 1.  "ecmp mode enhanced"

    Posted Jan 04, 2022 11:02 AM

    Can anyone better explain what "ecmp mode enhanced" really enables?

    The docs say:

    When one or multiple ECMP routes fail, the default ECMP mode enables the device to reallocate all traffic to the remaining routes.

    The enhanced ECMP mode enables the device to reallocate only the traffic of the failed routes to the remaining routes.


    Which isn't too clear to me... Does it enable/disable some hardware-based "fast reroute" type functionality?

    Thanks!



  • 2.  RE: "ecmp mode enhanced"

    EMPLOYEE
    Posted Jan 05, 2022 06:44 AM
    Hi,


    Equal-cost multi-path (ECMP) gives ability to take multiple routes with the same cost that were traditionally only use one of the routes and give the ability to load balance the across multiple links.
    We can say these routes to implement equal-cost multi-path (ECMP) load sharing. The forwarding engine identifies paths by next-hop. When forwarding a packet the router must decide which next-hop (path) to use.

    Default ECMP mode enables devices to rellocate all traffic to the remaining routes whereas enhanced ECMP mode reallocate only the traffic of the failed routes to the remaining routes.

    Can say fast reroute with load sharing.

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    Thanks!
    AKG
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  • 3.  RE: "ecmp mode enhanced"

    Posted Feb 17, 2022 06:20 AM
    When one or multiple ECMP routes fail, the default ECMP mode enables the device to reallocate all traffic to the remaining routes. The enhanced ECMP mode enables the device to reallocate only the traffic of the failed routes to the remaining routes. This configuration takes effect at reboot. Make sure the reboot does not impact your network.

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    David Battle
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