Can u give me a little hint. I have tried by playing bandwidth and delay on router Hollywood. but it is not working that way! Is there another means?
EIGRP Summarization Leak-Map
Scenario:
The movie industry is dominated by Holly- and Bollywood. Recently the two companies are creating movies together and using a shared network infrastructure. To make sure the routing tables of the EIGRP routes don't grow too much you decide to implement summarization. This has a unwanted side-effect however since now the serial-link is used to reach some networks.
Goal:
- All IP addresses have been preconfigured for you.
- Configure EIGRP on both routers and advertise everything. Activate it on both interfaces.
- Create a summary advertising a default route on router Bollywood using the FastEthernet 0/0 interface.
- Ensure router Hollywood doesn't use the serial link to reach network 2.2.2.0 /24. You are not allowed to create any static routes.
IOS:
c3640-jk9s-mz.124-16.bin
Topology:
Video Solution:
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Comments (4)
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ReneMolenaar 2011-11-15 00:50:03Sure
Routers will always use "most specifix prefix routing". This means that after configuring the summary the router knows two things:
It can reach 0.0.0.0/0 by going through the FastEthernet link.
It can reach 2.2.2.0/24 by going through the Serial link.Whenever you have packets destined for 2.2.2.2 it will choose the serial because 2.2.2.0 /24 is a better match than 0.0.0.0/0.
In order to make sure our router uses the FastEthernet link to reach 2.2.2.2 we need to make sure it learns 2.2.2.0 /24 through the FastEthernet link. Google for the "leak map" function for EIGRP summaries and you'll find the answer.
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radulescu.sorin.stefan 2012-04-24 19:04:00Hi,
Is there another way to achieve this, besides static routes? Working on eigrp metrics seems no good to me, as it advertises the summary no matter what.
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ReneMolenaar 2012-04-27 12:14:25
They key to this lab is using the leak-map feature for summaries. This will "remove" a certain prefix from a summary. Your router will always look up the most specific prefix in it's routing table.
Static routes can solve 90% of the issues but that's no fun
