Tunnel flapping, help please

FireRORFireROR
edited March 4 in Home Lab


Hi

I recently got a weird issue with Cisco PT.

The setup as followed;

R0 and R6 are connected through GRE tunnel, and announced in ospf process. I did put static route in to prevent the route loop.

Everything is working fine until I put default-information originate into R1
Router1 has default route.

%LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel60, changed state to down
%ADJ-5-PARENT: Midchain parent maintenance for IP midchain out of 60 65E900C0 - looped chain attempting to stack
%TUN-5-RECURDOWN: 60 temporarily disabled due to recursive routing

Before:

R6#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route

Gateway of last resort is not set

 6.0.0.0/24 is subnetted, 1 subnets

C 6.6.6.0 is directly connected, Loopback0
12.0.0.0/24 is subnetted, 1 subnets
S 12.12.12.0 is directly connected, FastEthernet0/0
16.0.0.0/24 is subnetted, 1 subnets

C 16.16.16.0 is directly connected, Tunnel60
36.0.0.0/24 is subnetted, 1 subnets
************This is the directly connected route ******************

C 36.36.36.0 is directly connected, FastEthernet0/0

After:
sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route

Gateway of last resort is 16.16.16.1 to network 0.0.0.0

 1.0.0.0/32 is subnetted, 1 subnets

O IA 1.1.1.1 [110/1001] via 16.16.16.1, 00:00:00, Tunnel60
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.4 [110/1002] via 16.16.16.1, 00:00:00, Tunnel60
6.0.0.0/24 is subnetted, 1 subnets
C 6.6.6.0 is directly connected, Loopback0
11.0.0.0/24 is subnetted, 1 subnets
O 11.11.11.0 [110/1001] via 16.16.16.1, 00:00:00, Tunnel60
12.0.0.0/24 is subnetted, 1 subnets
S 12.12.12.0 is directly connected, FastEthernet0/0
14.0.0.0/24 is subnetted, 1 subnets
O IA 14.14.14.0 [110/1001] via 16.16.16.1, 00:00:00, Tunnel60
16.0.0.0/24 is subnetted, 1 subnets
O 16.16.16.0 [110/1000] via 16.16.16.0, 00:00:10, Tunnel60
36.0.0.0/24 is subnetted, 1 subnets

************Why this has been replaced by OSPF inter area route?****************

C 36.36.36.0 is directly connected, FastEthernet0/0
111.0.0.0/32 is subnetted, 1 subnets
O 111.111.111.1 [110/1002] via 16.16.16.1, 00:00:00, Tunnel60
O*E2 0.0.0.0/0 is possibly down, routing via 16.16.16.1, Tunnel60

default-information orig should only inject default route right? Is this a bug from Cisco PT?

Thanks

Alex

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