Solved

Question on EIGRP route (traceroute weird)

Posted on 2010-11-30
5
561 Views
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
0
Comment
Question by:orus
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
5 Comments
 
LVL 17

Expert Comment

by:rochey2009
ID: 34241916
Hi,

It's alternating each probe over both paths.
0
 

Author Comment

by:orus
ID: 34241969
is this normal behavior?
0
 
LVL 17

Expert Comment

by:rochey2009
ID: 34242051
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.
0
 

Author Comment

by:orus
ID: 34242176
final question. What is the actual path between R1 and 172.16.1.1 (r4)
0
 
LVL 17

Accepted Solution

by:
rochey2009 earned 500 total points
ID: 34242291
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.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Multiple MPLS Circuits Connecting to LAN 3 58
Public DNS  Vs BGP 20 58
Understanding Extended-Access List 6 37
Advice on router and switch 25 42
Quality of Service (QoS) options are nearly endless when it comes to networks today. This article is merely one example of how it can be handled in a hub-n-spoke design using a 3-tier configuration.
I recently attended Cisco Live! in Las Vegas, a conference that boasted over 28,000 techies in attendance, and a week of hands-on learning hosted by a solid partner with which Concerto goes to market.  Every year, Cisco displays cutting-edge technol…
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…
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…

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question