MPLS - CE-PE routing : OSPF Superbackbone

Change OSPF areas to area 1 in R4, area 2 in R5, and area 3 in R6.


R4#
router ospf 1
 network 1.1.4.4 0.0.0.0 area 1
 network 1.1.14.4 0.0.0.0 area 1

R5#
router ospf 1
 network 1.1.5.5 0.0.0.0 area 2
 network 1.1.25.5 0.0.0.0 area 2

R6#
router ospf 1
 router-id 1.1.6.6
 network 1.1.6.6 0.0.0.0 area 3
 network 1.1.36.6 0.0.0.0 area 3

R1#
router ospf 1 vrf company1
 network 1.1.14.1 0.0.0.0 area 1

R2#
router ospf 1 vrf company1
 network 1.1.25.2 0.0.0.0 area 1

R3#
router ospf 1 vrf company1
 network 1.1.36.3 0.0.0.0 area 1

The result is just same because they are connected MPLS superbackbone.


What if the loopback 0 in R4 is included into area 0 as follow.

R1#
conf t
router ospf 1
network 1.1.4.4 0.0.0.0 area 0

### The loopback 0 network 1.1.4.4 is included into ospf area 0. However, R1 doesn't recieves 1.1.4.4 network.

Of cource, R5 and R6 don't receive the 1.1.4.4 network as well.

Set virtual link between ABR(R4) and PE(R1)

R1#
router ospf 1 vrf company1
area 1 virtual-link 1.1.4.4
R4#
router ospf 1
area 1 virtual-link 1.1.1.1

Topology: