Hmmm... this is a tricky one....
since we cannot disable auto-summarization, are we allowed to make changes to the network design?
EIGRP Auto Summarization
Scenario:
Working as a freelance network engineer you have some strange customers. One of them is a scatterbrain inventor who claims to work on a 'world-changing' machine. He has problems with his network and is currently unable to upload some schematics. The routing protocol of choice is EIGRP (Enhanced Interior Gateway Routing Protocol) and since you are an expert you should be able to fix his problems....back to the labs!
Goal:
- All IP addresses have been preconfigured for you.
- EIGRP AS123 has been preconfigured for you and is advertising all networks.
- You are not allowed to disable EIGRP auto-summarization.
- When you try to reach the networks on the loopback interfaces from router Delorean you have reachability problems, solve this problem.
- When you send a ping from router McFly's loopback0 interface to router Brown's loopback0 interface you have reachability problems, solve this problem.
- Ensure there is full reachability for all networks.
IOS:
c3640-jk9s-mz.124-16.bin
Topology:
Video Solution:
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Comments (12)
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kumar981 2010-12-16 21:20:38
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ReneMolenaar 2010-12-16 21:58:29Nope...no changes to the design, just router commands
good luck!
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kumar981 2010-12-17 19:05:01
Alright, summarization is a go?
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ReneMolenaar 2010-12-18 13:18:28
You are on the right track ;D
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plague22 2011-01-06 15:49:23the lab says "You are not allowed to disable EIGRP auto-summarization."
Comment above makes me think we can do turn off auto summarization?Please clarify
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kumar981 2011-01-06 19:15:44
Nope... it means that you are not supposed to use "no auto-summary" command in the eigrp process...
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jefpalma 2011-01-29 04:14:13MCFLY#show running-config interface fastEthernet 0/0
Building configuration...Current configuration : 154 bytes
!
interface FastEthernet0/0
ip address 192.168.12.1 255.255.255.0
ip summary-address eigrp 123 172.16.1.0 255.255.255.0 5
duplex auto
speed auto
endMCFLY#
BROWN#show running-config interface fastEthernet 0/0
Building configuration...Current configuration : 154 bytes
!
interface FastEthernet0/0
ip address 192.168.23.3 255.255.255.0
ip summary-address eigrp 123 172.16.2.0 255.255.255.0 5
duplex auto
speed auto
endBROWN#
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Akiii 2011-02-05 18:48:27Deep,
Why do you configure summary on the fastethernet interfaces isntead of doing it on the loopback?
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rafael.libanio.sp 2011-02-08 04:12:02É o seguinte...
tem que configurar resumo de rota nos routers: McFly e Brown:
ip summary-address eigrp 123 172.16.1.0 255.255.255.0 192.168.12.2
ip summary-address eigrp 123 172.16.2.0 255.255.255.0 192.168.23.2Por que?
Pois por padrão as rotas classfull são sumarizadas automaticamente com o comando auto-summary habilitado. O AD(distancia administrativa) de uma rota sumarizada é 5. Fazendo também a sumarização de rotas pelos comandos acima, o que vai prevalecer para o router é a rota sumarizada mais específica. Correto?
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Ollie 2011-07-20 15:41:55I think I remember that from my CCNA !! If you can't disable auto-summarization the only alternative is static routes,however redistributing this creates an exterior EX route which doesn't seem to get summarized.
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Ollie 2011-07-20 14:19:28
I put a static route and redistributed it into EIGRP with the same metrics as the interface, is this correct because it works?
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ReneMolenaar 2011-07-21 00:19:57
Hi Oliver,
Static routes and redistribution will work but you can also fix this one by creating a summary. Even if auto-summarization is enabled for EIGRP you can still create summaries with a subnet mask, this can solve your problem here.
The video solution is on youtube, i'll add the config here within 24 hours.
Rene