Ah this was great! 45 mins of pain:
Eigrp+ospf+route redistribution+route-maps+Default routes+Tags--->Fun
As promised, I will keep all the scenarios with config
R1-->networks 10.1.0.0/21 + 10.1.8.0/24 + 192.168.12.0/24 + 192.168.13.0/24 +eigrp + no auto+ route summarization on s1/1
R2-->net 1.1.1.0/24(lo +public connection+default route to null 0) + 192.168.24.0/24 + 192.168.12/0 + eigrp + Eigrp Summarization on s1/1
R3-->networks 192.168.13.0/24 + 192.168.34.0/24
R4---> net 192.168.24.0/24 + 192.168.34.0/24 + Redistribution to ospf area 0 on s1/2 -->172.16.16.0/24 + default route of eigrp should be having tag and metric-type e2 and rest should have tag and metric type e1. Do not allow 10.1.8.0/24 in the ospf. In ospf the default route should be the same as default route of the eigrp.
No auto summary in eigrp
R1
=================
!
!
interface Loopback1
ip address 10.1.1.1 255.255.255.0
!
interface Loopback2
ip address 10.1.2.1 255.255.255.0
!
interface Loopback3
ip address 10.1.3.1 255.255.255.0
!
interface Loopback4
ip address 10.1.4.1 255.255.255.0
!
interface Loopback5
ip address 10.1.5.1 255.255.255.0
!
interface Loopback6
ip address 10.1.6.1 255.255.255.0
!
interface Loopback7
ip address 10.1.7.1 255.255.255.0
!
interface Loopback8
ip address 10.1.8.1 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 192.168.12.1 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 192.168.13.1 255.255.255.0
ip summary-address eigrp 100 10.1.0.0 255.255.248.0 5
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router eigrp 100
network 10.1.0.0 0.0.255.255
network 192.168.12.0
network 192.168.13.0
no auto-summary
!
=================
R2
interface Loopback100
ip address 1.1.1.1 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 192.168.12.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 192.168.24.1 255.255.255.0
ip summary-address eigrp 100 10.1.0.0 255.255.248.0 5
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router eigrp 100
network 1.1.1.0 0.0.0.255
network 192.168.12.0
network 192.168.24.0
auto-summary
!
ip http server
!
ip default-network 1.0.0.0
ip route 1.1.1.0 255.255.255.0 Null0
!
===========================================
R3
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 192.168.13.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 192.168.34.1 255.255.255.0
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router eigrp 100
network 192.168.13.0
network 192.168.34.0
auto-summary
!
=====================================
R4
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 192.168.24.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 192.168.34.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/2
ip address 172.16.16.1 255.255.255.0
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router eigrp 100
network 192.168.24.0
network 192.168.34.0
auto-summary
!
router ospf 100
log-adjacency-changes
redistribute eigrp 100 subnets route-map eigrp2ospf
network 172.16.16.0 0.0.0.255 area 0
default-information originate
!
ip http server
!
!
!
access-list 2 permit 192.168.34.0 0.0.0.255
access-list 2 permit 192.168.13.0 0.0.0.255
access-list 2 permit 10.1.8.0 0.0.0.255
!
route-map eigrp2ospf permit 10
match ip address 1
set metric-type type-1
set tag 10
!
route-map eigrp2ospf permit 20
match ip address 2
set tag 20
!
=======================================
R5
!
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 172.16.16.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router ospf 100
log-adjacency-changes
network 172.16.16.0 0.0.0.255 area 0
!
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