Lab 26 – OSPF Virtual Link Example 3

Prerequisites: CCNP level skills.
Note!
Virtual links are also used to connect dis-contiguous area 0 (e.g. company aquisition etc.)

Topology

Pic. 1 – OSPF Topology.
Task 1
Configure OSPF so that area 0 is contiguous as per OSPF design requirements. Do not change areas already configured.

Lab Solution

Note!
Before configuring a virtual link, the routing tables are incomplete due to the fact that the backbone area (area 0) is dis-contiguous.

Pic. 2 – R5’s Routing Table.
Pic. 3 – R6’s Routing Table.
Task 1
Configure OSPF so area 0 is contiguous as per OSPF design requirements. Do not change areas already configured.

R1 Configuration:

!
router ospf 1
router-id 1.1.1.1
log-adjacency-changes
area 1 virtual-link 2.2.2.2
network 10.1.12.1 0.0.0.0 area 1
network 10.1.13.1 0.0.0.0 area 0
network 172.16.101.1 0.0.0.0 area 1
!

R2 Configuration:

!
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
area 1 virtual-link 1.1.1.1
network 10.1.12.2 0.0.0.0 area 1
network 10.1.24.2 0.0.0.0 area 0
network 172.16.102.2 0.0.0.0 area 1
!

Verification:

Pic. 4 – R5’s Routing Table.

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