DMVPN Neighbour relationship flapping problem

[dwaynepeeters]

Hi all,

I've am trying to build a DMVPN lab, but am having a hard time getting it to work properly.

And I was wondering if someone would like to help me out.

I really don't have a clue how to fix this,

thanks in advance.

The error looks like this:

I have got the following topology:

And my configuration looks like this:

ISP:

=====================

interface f1/0

ip address 192.168.1.1 255.255.255.0

duplex full

no shutdown

interface f1/1

ip address 192.168.2.1 255.255.255.0

duplex full

no shutdown

interface f2/0

ip address 192.168.3.1 255.255.255.0

duplex full

no shutdown

interface f2/1

ip address 192.168.4.1 255.255.255.0

duplex full

no shutdown

=====================

Hub 1:

====================

interface f1/0

ip address 192.168.1.100 255.255.255.0

duplex full

no shutdown

ip route 192.168.2.0 255.255.255.0 192.168.1.1

ip route 192.168.3.0 255.255.255.0 192.168.1.1

ip route 192.168.4.0 255.255.255.0 192.168.1.1

interface tunnel0

ip address 10.1.1.1 255.255.255.0

ip nhrp map multicast dynamic

ip nhrp network-id 1

tunnel source 192.168.1.100

tunnel mode gre multipoint

ip mtu 1416

interface tunnel0

no ip next-hop-self eigrp 1

no ip split-horizon eigrp 1

router eigrp 1

network 192.168.0.0

network 172.16.0.0

network 10.0.0.0

no auto-summary

====================

Hub 2:

====================

interface f1/0

ip address 192.168.2.100 255.255.255.0

duplex full

no shutdown

ip route 192.168.1.0 255.255.255.0 192.168.1.1

ip route 192.168.3.0 255.255.255.0 192.168.1.1

ip route 192.168.4.0 255.255.255.0 192.168.1.1

interface tunnel0

ip address 10.1.1.2 255.255.255.0

ip nhrp map multicast dynamic

ip nhrp network-id 1

tunnel source 192.168.2.100

tunnel mode gre multipoint

ip mtu 1416

interface tunnel0

no ip next-hop-self eigrp 1

no ip split-horizon eigrp 1

router eigrp 1

network 192.168.0.0

network 172.16.0.0

network 10.0.0.0

no auto-summary

====================

Spoke 1:

====================

interface f1/0

ip address 192.168.3.2 255.255.255.0

duplex full

no shutdown

interface lo0

ip address 172.16.3.1 255.255.255.0

no shut

ip route 192.168.1.100 255.255.255.255 192.168.3.1

ip route 192.168.2.100 255.255.255.255 192.168.3.1

interface tunnel0

ip address 10.1.1.3 255.255.255.0

ip nhrp map 10.1.1.1 192.168.1.100

ip nhrp map multicast 192.168.1.100

ip nhrp network-id 1

ip nhrp nhs 10.1.1.1

ip nhrp map 10.1.1.2 192.168.2.100

ip nhrp map multicast 192.168.2.100

ip nhrp nhs 10.1.1.2

tunnel source 192.168.3.2

tunnel mode gre multipoint

ip mtu 1416

interface tunnel0

no ip next-hop-self eigrp 1

no ip split-horizon eigrp 1

router eigrp 1

network 192.168.0.0

network 172.16.0.0

network 10.0.0.0

no auto-summary

==================

Spoke 2:

====================

interface f1/0

ip address 192.168.4.2 255.255.255.0

duplex full

no shutdown

interface lo0

ip address 172.16.4.1 255.255.255.0

no shut

ip route 192.168.1.100 255.255.255.255 192.168.4.1

ip route 192.168.2.100 255.255.255.255 192.168.4.1

interface tunnel0

ip address 10.1.1.4 255.255.255.0

ip nhrp map 10.1.1.1 192.168.1.100

ip nhrp map multicast 192.168.1.100

ip nhrp network-id 1

ip nhrp nhs 10.1.1.1

ip nhrp map 10.1.1.2 192.168.2.100

ip nhrp map multicast 192.168.2.100

ip nhrp nhs 10.1.1.2

tunnel source 192.168.4.2

tunnel mode gre multipoint

ip mtu 1416

interface tunnel0

no ip next-hop-self eigrp 1

no ip split-horizon eigrp 1

router eigrp 1

network 192.168.0.0

network 172.16.0.0

network 10.0.0.0

no auto-summary

[Harish Balakrishnan]

Hello Peeters

Please remove the  network 192.168.0.0 from all eigrp and see

Harish.

[dwaynepeeters]

Hi Harish,

I'm sorry that didn't solve the problem.

I have removed the 192.168.0.0 network as mentioned, but the flapping still occurs.

[dwaynepeeters]

Does nobody have a solution for this one?

[Harish Balakrishnan · Accepted solution]

Hello Dwayne,

The routes on Hub2 is as follows

ip route 192.168.1.0 255.255.255.0 192.168.1.1

ip route 192.168.3.0 255.255.255.0 192.168.1.1

ip route 192.168.4.0 255.255.255.0 192.168.1.1

the gateway should be 192.168.2.1 ? .. is it a typo or actual config ?

Harish

[dwaynepeeters]

Damned, am I that stupid!

Harish thank you very very much, that was my problem!

Amazing how such a tiny misconfig can cause you days of works trying to figger out what's wrong.

I really didn't saw it.

Again, many thanks!

Grtz

Dwayne

[Harish Balakrishnan]

Great..  no problem mate.. that happens to me as well . when we are  focused on a new technology we are tend to forget the basics