EIGRP - load balancing

Unanswered Question
Sep 9th, 2007

Hi, I have 4 routers (on two sites)

2620 (router 1) and 1841 (router 2) on one side (A) (on the same lan)

1750 (3) and 1841 (4) on the other side (B) (on the same lan)

2620 connected to 1750. 1841 connected to another 1841.

I'm trying to achive load balancing between two WAN links with eigrp.

If I look at router (1)(sh ip route) I can see the route to LAN B through routers 2 and 3. Also at router 3 I can see route to LAN A through routers 1 and 4. Strange thing is that from routers 2 and 4 I see only one route to lan B and A respectively.

I've configured variance 128 on all routers.

Please advise.

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lgijssel Sun, 09/09/2007 - 09:53

To help you best, we would need to look at the output of "sh ip route" on your routers and perhaps also on parts of the config.

For a start, can you verify that the bandwidth is set to the same value on all links/routers?

The most probable explanation would be a difference in metric. Two of the routers will then see a "better path" over the other link, the others will not use the alternative path because the metric is worse than the direct link and larger than the variance.




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