problem with EIGRP configuration

xyz47

Hi,
This is my the very first post in here.

I am a newbie to CCNA I have started learning like 3 months ago... so the question may be funny or at least elementary.

Could anyone tell me what's wrong with the configuration of S0/0/0 R1 and S0/0/0 R2 ?
Those 2 interfaces form adjacency and they lose the adjacency after few seconds.
I have configured as the same values bandwidth and hello-interval.
There is also md5 authentication key which seems to be okay (at least for me)
On S0/0/0 of R1 there's manually configured summary address of 3 loopback interfaces is it the correct summary addresss for:
Lo1 172.27.1.1 255.255.255.0 Lo2 172.27.2.1 255.255.255.0 and Lo3 172.27.3.1 255.255.255.0 ??

Please see the attached screenshots.

DCD

You screenshot did not load. Paste up you compete configuration so we can troubleshoot also if you did it in PT put it in Dropbox or Gdrive with a link here.

xyz47

Woooppss... sorry for that... so hereunder U can see the problem:

dontstop

This has something to do with you setting the hello timers for those interfaces. I quickly tested this in my PT and had the same problem with the hello-timer at >15. It's possible that PT hard codes the dead-timer instead of making it 3 * Hello. Values <15 work fine.

So instead of

hello-interval = 30 
dead-interval = hello-interval * 3
---> dead-interval = 90

It is

hello-interval = 30 
dead-interval = 15
---> dead-interval = 15

So the router is telling it's neighbor *always* to expect hello's within 15 seconds or less but it's sending them every 30 seconds causing the connection to flap.