EIGRP retry limit reached tunnel is down. DMVPN.

[linus-ardstal]

Hi! I am having some trouble with EIGRP adjacency flapping over my DMVPN network.

*Dec 5 12:55:29.412: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.0.5 (Tunnel0) is down: retry limit exceeded
*Dec 5 12:55:32.919: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.0.5 (Tunnel0) is up: new adjacency

:::R2:::

interface Tunnel0
ip address 192.168.0.2 255.255.255.0
no ip redirects
ip mtu 1400
ip nhrp authentication CCNP
ip nhrp map 192.168.0.5 10.10.5.1
ip nhrp map multicast 192.168.0.5
ip nhrp network-id 1
ip nhrp holdtime 300
ip nhrp nhs 192.168.0.5
ip tcp adjust-mss 1360
delay 1000
tunnel source GigabitEthernet0/0
tunnel mode gre multipoint
tunnel key 1
!

interface Loopback0

ip add 2.2.2.2 255.255.255.255
interface GigabitEthernet0/0
ip address 10.10.200.1 255.255.255.0
duplex auto
speed auto
media-type rj45

router eigrp 1
network 1.1.1.1 0.0.0.0
network 192.168.0.0
!
ip route 0.0.0.0 0.0.0.0 10.10.200.2

:::HUB:::

interface Tunnel0
ip address 192.168.0.5 255.255.255.0
no ip redirects
ip mtu 1400
no ip next-hop-self eigrp 1
no ip split-horizon eigrp 1
ip nhrp authentication CCNP
ip nhrp network-id 1
ip nhrp holdtime 300
ip tcp adjust-mss 1360
delay 1000
tunnel source GigabitEthernet0/0
tunnel mode gre multipoint
tunnel key 1
!

interface Loopback0
ip address 5.5.5.5 255.255.255.255

interface GigabitEthernet0/0
ip address 10.10.5.1 255.255.255.0
!
router eigrp 1
network 5.5.5.5 0.0.0.0
network 192.168.0.0
!
ip route 0.0.0.0 0.0.0.0 10.10.5.2

 :::WAN:::

interface GigabitEthernet0/0
ip address 10.10.5.2 255.255.255.0
!
interface GigabitEthernet0/1
ip address 10.10.100.2 255.255.255.0
!
interface GigabitEthernet0/2
ip address 10.10.200.2 255.255.255.0

[MHM Cisco World · Accepted solution]

ip nhrp map multicast dynamic <<- add this to Hub tunnel 

MHM

[MHM Cisco World]

This also need to correct.

ip nhrp map 192.168.0.5 10.10.5.1
ip nhrp map multicast 10.10.5.1

MHM

[Torbjørn]

Good catch! I think that is the issue.

[linus-ardstal]

This is certainly it. For some reason my IOSv in CML wont accept the command, no errors or anything. It does not show up in the running-config.

[Torbjørn]

It is enabled by default, hence it does not show in the configuration. You can verify this by creating another DMVPN tunnel interface and viewing it's complete configuration with "show run all"

[linus-ardstal]

Then I do not know what is wrong. The adjacency goes down after the holdtimer has expired, then it comes back up a few seconds later.

[MHM Cisco World]

If issue still' can you share last config 

MHM

[linus-ardstal]

I remade the lab, there might be some configuration changes from my original post.

R1:

interface Tunnel0
ip address 192.168.0.1 255.255.255.0
no ip redirects
ip mtu 1400
ip nhrp authentication CCNP
ip nhrp map 192.168.0.5 10.50.1.1
ip nhrp map multicast 192.168.0.5
ip nhrp network-id 1
ip nhrp holdtime 300
ip nhrp nhs 192.168.0.5
ip tcp adjust-mss 1360
delay 1000
tunnel source GigabitEthernet0/0
tunnel mode gre multipoint
tunnel key 1

router eigrp 100
network 10.10.1.0 0.0.0.255
router eigrp 1
network 1.1.1.1 0.0.0.0
network 192.168.0.0
passive-interface GigabitEthernet0/0

Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 10.10.1.1 YES manual up up
Loopback0 1.1.1.1 YES manual up up
Tunnel0 192.168.0.1 YES manual up up

WAN:

router eigrp 100
network 10.10.1.0 0.0.0.255
network 10.20.1.0 0.0.0.255
network 10.50.1.0 0.0.0.255
router eigrp 1
passive-interface GigabitEthernet0/0
passive-interface GigabitEthernet0/1
passive-interface GigabitEthernet0/2

Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 10.50.1.2 YES manual up up
GigabitEthernet0/1 10.10.1.2 YES manual up up
GigabitEthernet0/2 10.20.1.2 YES manual up up

HUB:

interface Tunnel0
ip address 192.168.0.5 255.255.255.0
no ip redirects
ip mtu 1400
no ip next-hop-self eigrp 1
no ip split-horizon eigrp 1
ip nhrp authentication CCNP
ip nhrp network-id 1
ip nhrp holdtime 300
ip tcp adjust-mss 1360
delay 1000
tunnel source GigabitEthernet0/0
tunnel mode gre multipoint
tunnel key 1

no ip next-hop-self eigrp 1
no ip split-horizon eigrp 1
router eigrp 100
network 10.50.1.0 0.0.0.255
router eigrp 1
network 5.5.5.5 0.0.0.0
network 192.168.0.0
passive-interface GigabitEthernet0/0

Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 10.50.1.1 YES manual up up
Loopback0 5.5.5.5 YES manual up up
Tunnel0 192.168.0.5 YES manual up up

[MHM Cisco World]

ip nhrp map 192.168.0.5 10.10.5.1
ip nhrp map multicast 10.10.5.1 <<- this need to correct 

MHM

[linus-ardstal]

I replied with new configs in your other comment, please check that one

[Torbjørn]

This configuration should work as far as I can see.
How often do the adjacencies flap? Which image are you using?

[linus-ardstal]

The adjacencies flap very un-evenly. 08:54:22, 08:55:44, 08:57:07, 08:58:27, around every 90 seconds it seems.

I am running this in CML with IOSv images.

[paul driver]

Hello
Its possible the underlay is causing the issue with your default static routes on the hub and spokes

can you try the following:

Hub/Spoke/WAN rtrs
either remove the default static routes tand add more specific statics for the transit network 
               or
remove all static default routes ,
enable eigrp 100 ONLY on the transit interfaces 

Hub/Spoke/rtrs
router eigrp 1
passive interface the transit interfaces

[linus-ardstal]

I tried putting the underlay in another EIGRP 100  and passive-interfaces in EIGRP 1, but I still get the same problem