R1#sh run | b router
router eigrp 100
 redistribute rip metric 128 20000 255 1 1500
 redistribute ospf 1 metric 1 1 1 1 1500
 network 180.40.7.66 0.0.0.0
 network 208.28.1.66 0.0.0.0
 neighbor 180.40.7.65 Serial0/0.2
 auto-summary
!
router ospf 1
 router-id 1.1.1.1
 log-adjacency-changes
 redistribute eigrp 100 subnets tag 11
 redistribute rip subnets tag 1
 network 13.13.13.1 0.0.0.0 area 0
 network 17.57.100.1 0.0.0.0 area 0
 distance ospf external 177  <----------------- option 1 to fix tunnel flapping
!
router rip
 version 2
 redistribute eigrp 100 metric 3 route-map Prob5
 redistribute ospf 1 metric 6
 passive-interface Ethernet0/0
 network 208.28.1.0
 network 223.1.1.0
 maximum-paths 3
 distance 174 0.0.0.0 255.255.255.255 1
 no auto-summary
!


R3#sh run | b router
router ospf 1
 router-id 3.3.3.3
 log-adjacency-changes
 redistribute rip subnets tag 3
 network 13.13.13.3 0.0.0.0 area 0
 network 17.80.1.1 0.0.0.0 area 0
 distance 255 1.1.1.1 0.0.0.0 1  <----------------- option 2 to fix tunnel flapping
!
router rip
 version 2
 no validate-update-source
 timers basic 30 180 0 240
 redistribute ospf 1 metric 5
 network 180.40.0.0
 network 208.28.1.0
 network 222.1.1.0
 neighbor 208.28.1.3
 neighbor 208.28.1.1
 maximum-paths 3
 no auto-summary
!
access-list 1 permit 223.1.1.0
access-list 2 deny   223.1.1.0
access-list 2 permit any
!
!


OR

R3#sh run | b router ospf
router ospf 1
 router-id 3.3.3.3
 log-adjacency-changes
 redistribute rip subnets tag 3
 network 13.13.13.3 0.0.0.0 area 0
 network 17.80.1.1 0.0.0.0 area 0
 distribute-list 2 in Tunnel0  <----------------- option 3 to fix tunnel flapping
!