Re: OSPF Forwarding Address

I did not see that requirement, that ospf is not enabled on R4
outside... where is it ?

I have just labbed it (with OSPF on the outside) and it works:
R2#sh ip route
Codes: C - connected, S - static, 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
       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

O E2 200.200.200.0/24 [110/100] via 10.0.2.4, 00:00:24, Serial1/0
     100.0.0.0/32 is subnetted, 1 subnets
O 100.100.100.100 [110/2] via 10.0.1.1, 00:00:24, FastEthernet0/0
     172.16.0.0/24 is subnetted, 1 subnets
O 172.16.1.0 [110/12] via 10.0.1.3, 00:00:24, FastEthernet0/0
     10.0.0.0/24 is subnetted, 3 subnets
C 10.0.2.0 is directly connected, Serial1/0
O 10.0.3.0 [110/11] via 10.0.1.3, 00:00:24, FastEthernet0/0
C 10.0.1.0 is directly connected, FastEthernet0/0

R3#sh ip route
Codes: C - connected, S - static, 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
       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

O E2 200.200.200.0/24 [110/100] via 10.0.3.5, 00:00:41, Serial1/0
                      [110/100] via 10.0.1.2, 00:00:41, FastEthernet0/0
     100.0.0.0/32 is subnetted, 1 subnets
O 100.100.100.100 [110/2] via 10.0.1.1, 00:00:41, FastEthernet0/0
     172.16.0.0/24 is subnetted, 1 subnets
O 172.16.1.0 [110/11] via 10.0.3.5, 00:00:41, Serial1/0
     10.0.0.0/24 is subnetted, 3 subnets
O 10.0.2.0 [110/11] via 10.0.1.2, 00:00:41, FastEthernet0/0
C 10.0.3.0 is directly connected, Serial1/0
C 10.0.1.0 is directly connected, FastEthernet0/0

-Carlos

David Bloom @ 11/09/2014 13:41 -0300 dixit:
> That is the trick though, one router enables ospf on the "outside"
> interface, the other does not. This is the requirement. Were you able
> to read the full post on the link?

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net