eigrp auto-summary not working

[Aoi]

Hello

I have a simple lab trying to do an EIGRP auto-summary.
There are three routers in the lab: E8---E0---E2

auto-summary is configured on E0, and I am trying to summarize the loopback interfaces on E2 and verify the results on E8. I was expecting to see something like 1.0.0.0/8 but that wasn't what I see.

Would like any advice to see what I'm missing here.

[MHM Cisco World]

E8---E0---E2
try the following, 
first cofig the link between E8/E0/E2 with network command (dont use net 0.0.0.0), 
second redistribute the LO into eigrp and use auto-summary. 

[Aoi]

thank you, i tried your solution but unfortunately did not make any changes...

[MHM Cisco World]

interface X/X
ip summary-address eigrp Y 1.0.0.0 255.0.0.0 <<- this command summary the LO, config it in interface toward router you want

note:- can I see the not working config ?

[David Ruess]

Hello,

What happens when you move the auto summary command to the router that has the Loopbacks configured on it? Router E2 instead of E0. Can you show the output of that when you can? 

-David

[paul driver]

Hello
To summarise eigrp routes in traditional eigrp mode you do this at the interface level , in Named mode its performed  within the eigrp stanza under the address-family interface.

It seems you are using traditional eigrp and have enabled auto-summarization for all routes on rtr Eo out so only the classful subnets of EO local prefixes are advertised but this should not effect E2 advertised prefixes.

So to advertise a summary those E2 routes, summarise them on the E2 router under the physical interface connecting to E0

E2
int x.x
ip summary-address eigrp 900 2.2.0.0 255.255.0.0


 

[Iaroslav]

If you are trying to achieve summarization of routes, auto-summary is not a proper tool since it's a remnant of classful routing. In essence, it announces prefixes without masks (hence "summarization" to class boundary) but only when the update crosses classful boundary. Since you enabled auto-summary on E0 only, I suspect it originates the prefixes received as-is, since both links are in the same class. Try defining the loopbacks on E0 itself to make the update cross classful boundary, you should see them summarized.

Take a look at this post if you're looking for auto-summary explanation.
https://community.cisco.com/t5/networking-blogs/auto-summarization-in-simple-word/ba-p/4091417

If you're trying just to summarize the routes at E0 towards E8, use ip summary-address command instead.

[Georg Pauwen]

Hello,

post the full running configurations (sh run) of all three routers...

[MHM Cisco World]

I dont know why confuse, my first suggestion was clear he can do auto-summary in router originate the route of LO and you can use ip summary in any other router. 
I think he asking about second one, use summary in router that NOT originate the route. 
Thanks