EIGRP route summarization

[vault]

Hey everyone

I'd read once that auto-summarization won't work if a router connected to the same classful address.

So I use manul summarization with ip summary-address if-subcommand

Here's what I got 

R1-(gi0/0)---10.0.12.0/30---(gi0/0)-R2

Router R2 performs summarization for networks 10.0.0.0/24, 10.0.1.0/24, ..., 10.0.7.0/24:

configuration ommited

!

interface gi0/0

  ip summary-address eigrp 1 10.0.0.0/21

!

the problem is that R2 doesn't send that route (it doesn't appear in wireshark)

Using GNS3 with c7200-advipservicesk9-mz.152-4.S5 image

Thanks in advance

[Georg Pauwen]

Hello,

which networks are you advertising under the EIGRP process ? For the sake of simplicity, try to advertise all networks, and see if the other side receives the summary:

R2

interface gi0/0

ip summary-address eigrp 1 10.0.0.0/21

!

router eigrp 1

network 0.0.0.0

[vault]

Eigrp is active on every interfaces

[vault · Accepted solution]

The problem occured because of my inattentiveness

Previously I issued the command ip summary-address 10.0.0.0/21 with mentioning AD of 255 at the end

Then I deleted it and tried again, but that command added "summary-metric" parameter under my eigrp config mode. Now I deleted it and everything works fine

Thanks for replying

[paul driver]

Hello

You need to advertise at least one prefix pertaining to the summary, otherwise the summary will not get advertised.

res
Paul