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