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Forum Replies

  1. I just changed the text so that I can explain it a bit more.

    158720 = feasible distance (FD) of successor.
    412160 = feasible distance (FD) of feasible successor.

    All feasible successors that have a FD that is lower than FD of successor X multiplier will be used in load balancing.

    158720 x 3 (multiplier)= 476160

    412160 (FD of feasible successor) is lower than 476160 so we will use this feasible successor.

    I hope this explains it better.


  2. Hey,
    Comment below;

    “The feasible successor will be used if its feasible distance is lower than the feasible distance multiplied with a multiplier”

          This multiplier can be any number or it has to be 3?  Why?
           I am assuming it can be any random number to serve the purpose of variance.


  3. Rene - Best explanations of EIGRP I have seen and used. I’ve worked through many courses for CCNA but have yet to mess with the variance. It seems most kind of skip over that because it may not be required for the exam. My question is - do we have to manually set the variance in order for unequal cost load balancing to take place in EIGRP? I guess I just assumed EIGRP did equal and unequal cost load balancing by default. And for the heck of it, is there a real world or general consensus as to what is a good variance number to use or ballpark figure to stay around?

    Thanks a ton!

  4. Hi Alex,

    Glad to hear you like it!

    For unequal load balancing to work, you have to mess with the variance. By default EIGRP only does load balancing over equal cost paths. I doubt you will see this much in the real world…when you use EIGRP on a LAN, you probably use the same interfaces pretty much everywhere. If you want redundancy, you probably add some extra interfaces and you will use equal cost load balancing. Even if you have some low bandwidth interfaces, I doubt anyone would want to mess with the variance to use them.


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