OSPF Adjchg error, adj-5-parent error, recursive routing error in PT

[George Vanyan]

Basically, I have created a GRE tunnel

I'd put Packet Tracer file, but the discussion won't accept the format

these are the networks

OSPF 10
area 0

GRE tunnel
172.16.100.0 /30

CS1-R1 net
192.168.1.0 /30

R1-ISP net
1.1.1.0 /30

R2-ISP net
1.1.1.4 /30

R2-CS2
192.168.2.0 /30

The errors started randomly 10-15 minutes after finalizing the setup 

you can check everything in the command log. There is a chance I am missing something, a newbie yet

these are the errors from R1

00:20:10: %OSPF-5-ADJCHG: Process 10, Nbr 5.5.5.5 on Tunnel1 from LOADING to FULL, Loading Done

00:20:50: %OSPF-5-ADJCHG: Process 10, Nbr 5.5.5.5 on Tunnel1 from FULL to DOWN, Neighbor Down: Dead timer expired

00:20:50: %OSPF-5-ADJCHG: Process 10, Nbr 5.5.5.5 on Tunnel1 from FULL to DOWN, Neighbor Down: Interface down or detached

Error from R2: 

03:20:53: %OSPF-5-ADJCHG: Process 10, Nbr 4.4.4.4 on Tunnel1 from LOADING to FULL, Loading Done

%ADJ-5-PARENT: Midchain parent maintenance for IP midchain out of 1 65E900C0 - looped chain attempting to stack

%TUN-5-RECURDOWN: 1 temporarily disabled due to recursive routing

%LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel1, changed state to down

%ADJ-5-PARENT: Midchain parent maintenance for IP midchain out of 1 65E900C0 - looped chain attempting to stack

%TUN-5-RECURDOWN: 1 temporarily disabled due to recursive routing

03:21:03: %OSPF-5-ADJCHG: Process 10, Nbr 4.4.4.4 on Tunnel1 from FULL to DOWN, Neighbor Down: Interface down or detached

[George Vanyan]

100% agree. this is weird

[George Vanyan · Accepted solution]

I entered No default-information originate on R1 and no more errors occured, I'm still really new to networking, so might miss something obvious, but probably this was PT bug

[MHM Cisco World]

It can be PKT bug

interface Tunnel0
ip address 5.0.0.2 255.255.255.0
tunnel source Ethernet0/0
tunnel destination 100.0.0.1
!
interface Ethernet0/0
ip address 100.0.0.2 255.255.255.0
ip nat outside
ip virtual-reassembly in
!
interface Ethernet0/1
ip address 20.0.0.2 255.255.255.0
ip nat inside
ip virtual-reassembly in
!
router ospf 5
network 5.0.0.0 0.0.0.255 area 0
network 20.0.0.0 0.0.0.255 area 0
default-information originate
!
ip route 0.0.0.0 0.0.0.0 100.0.0.1

[George Vanyan]

Thanks for checking, I agree, that was a packet tracer behaviour