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Question on EIGRP route (traceroute weird)

Posted on 2010-11-30
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Last Modified: 2012-05-10
R1 has two paths to get to 172.16.1.1
via 2.2.2.1 and via 3.3.3.1

Why does the trace look like this?:

1  2.2.2.1  4 msec
   3.3.3.1   4 msec
   2.2.2.1 0 msec

2  1.1.1.1  4msec
   4.4.4.2  4msec
   1.1.1.1  4 msec na
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Question by:orus
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by:rochey2009
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Hi,

It's alternating each probe over both paths.
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by:orus
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is this normal behavior?
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by:rochey2009
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yes the per packet load balancing is normal for equal cost routes (and with some configuration using the EIGRP variance command for unequal cost routes). However in your case both the paths are not really equal since the path to 172.16.1.1 through R3 is an extra hop but this is a consequence of redistribution between protocols and can sometimes introduce suboptimal routes such as the one through R3.

I think you can change the per packet loadbalancing behaviour.
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by:orus
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final question. What is the actual path between R1 and 172.16.1.1 (r4)
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Accepted Solution

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rochey2009 earned 500 total points
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There are two paths

One of them goes from R1 to R2 via the 2.2.2.0 subnet and then onto R4 via the 4.4.4.0 subnet

The other goes from R1 to R3 via the 3.3.3.0 subnet, crosses the 1.1.1.0 subnet to R2 and then onto R4 via the 4.4.4.0 subnet. So this route is suboptimal due to the redistribution.
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After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

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