EIGRP Notes – Unequal Cost Path Load Balancing

Per the standard rules, please correct anything that’s wrong.

One of EIGRP’s big features is the ability to use unequal cost paths for load balancing.  This is done with the variance command.

variance : A multiplier used to calculate which feasible successors can be used as active routes.  The router takes integer and multiplies it by the successor’s feasible distance, and any FS with a an FD less than this new number gets submitted to the routing table manager.

maximum-paths : The maximum number of routes to submit to the route table manager.

traffic-share balanced : The router sends traffic based on a weighted values of the metric so that the lower metrics get more traffic.

traffic-share min : Only use the lowest metric route.  This seems kind of pointless to me.

traffic-share min across-interfaces : Use the lowest metric route but use routes out different interfaces if they exist.

Aaron Conaway

I shake my head around sometimes and see what falls out. That's what lands on these pages.

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1 comment for “EIGRP Notes – Unequal Cost Path Load Balancing

  1. Lindsay Hill
    June 6, 2011 at 7:21 pm

    I think the idea behind “traffic-share min” is to have the route already installed in the routing table, to minimise convergence time, isn’t it?

    Not that it’s going to make much difference, since the unused route will already be a feasible successor, having had to pass the FC in order to be used with variance.

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