eigrp

eigrp "no auto-summary"
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Subject Author Date
eigrp "no auto-summary" Phil Watkins 05-18-2005
Posted by Phil Watkins on May 18, 2005, 1:59 pm
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can anyone explain to me what the consequences of turning of
auto-summarisation on eigrp are? I've read the cisco books on the subject
but I just can't get my head around it. I've also setup a lab and turned
it on/off and don't see any changes in what routers are advertised. help!




Posted by kplab on May 18, 2005, 9:43 am
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If auto-summarization is enabled, the router will automatically
summarize routes at classful network boundary and advertise a single
route for an entire Class A, B, or C network. However, if your lab only
consists of classful networks, but not subnets, you will not see any
difference by turning the feature on or off.

KPLAB
http://www.kp-lab.com - Free CCNA Study Guide



Posted by Jonathan on May 18, 2005, 7:49 pm
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> can anyone explain to me what the consequences of turning of
> auto-summarisation on eigrp are?

Yeah, it turns EIGRP into a sucky protocol.

> I've read the cisco books on the subject but I just can't get my head
> around it. I've also setup a lab and turned it on/off and don't see any
> changes in what routers are advertised. help!

The default, 'auto-summary' summarizes on classful boundaries. This blows.
Turn it off.




Jonathan




Posted by sean courtney on May 18, 2005, 8:09 pm
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I think you would want to turn this off if you are using vlsm with
discontinous networks.. This is because a subnet may not "fit" into the
summarization

Maybe someone else can correct me if I am wrong.




On 5/18/05 8:59 AM, in article USHie.7647$WQ3.1318@newsfe5-gui.ntli.net,

> can anyone explain to me what the consequences of turning of
> auto-summarisation on eigrp are? I've read the cisco books on the subject
> but I just can't get my head around it. I've also setup a lab and turned
> it on/off and don't see any changes in what routers are advertised. help!
>
>



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