EIGRP loadbalancing

Unanswered Question
Jun 24th, 2007

I have two core swicthes connected to two diffrent routers .Both are router have seprate links to two diffrent destination.I have data and voice traffic i want to prefer one link for data and another link for voice traffic and i am using eigrp in my network using delay command under eigrp config how can i do that .

I have this problem too.
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sundar.palaniappan Sun, 06/24/2007 - 08:30

EIGRP, by default, uses minimum bandwidth + total delay * 256 to arrive at the composite metric for a route. Tweak the delay values on the interfaces to achieve load balancing as you desire. An alternative would be to use offset list under the EIGRP process to tweak the metrics. This is assuming that data and voice are different IP networks. Instead if they share the same network then you may have to use policy routing to force voice and data to take different paths.

It would help if you can post a simple topology diagram with IP addresses and a clear description of what you want to achieve.



royalblues Sun, 06/24/2007 - 08:48

Modifying the delay would affect the metric all routes learnt from the neighbor and hence doesn't seem to be a feasible solution in your case.

topology diagram would surely help


Pavel Bykov Sun, 06/24/2007 - 08:56

If your goal is to separate data and voice, you should use QoS. If you aren't familiar with QoS, you can use "auto qos voip".


Also, new version of EIGRP will able to have per-marking topology. I.E. packets with different DSCP codes will prefer different links. But this concept still relies on packets being marked.

As said in previous posts - if Voice destinations are different from data destinations, it is possible to separate the flows by routing. Otherwise you should use classification and marking QoS mechanisms.


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