Di Posting Oleh : Simple Learning
Kategori : Core Technologies OSPF Routing
Prerequisites: CCNP level skills.
Note!
Use topology Lab14. OSPF should be enabled on all interfaces with the most specific wildcard mask.
Topology
Pic. 1 - OSPF Multi-Area Topology.
Icons designed by: Andrzej Szoblik - http://www.newo.pl
Task List
Task 1
On R1 create a new loopback interface with the IP address 192.168.1.1/24. Advertise this network in OSPF as external prefix. Make sure that no other interfaces created in the future will get advertised.
Task 2
On R5 create a new loopback interface with IP address 192.168.5.5/24. Advertise this network as external E2 into OSPF domain.
Task 3
Configure routers in the area 1 so they do not accept any external and inter-area prefixes. Routers in area 1 must be able to reach the newly created networks. Routers in area 2 should be able to reach these networks as well.
Lab Solution
Task 1
On R1 create a new loopback interface with the IP address 192.168.1.1/24. Advertise this network in OSPF. Make sure that no other interfaces created in the future will get advertised.
R1 Configuration:
!
interface Loopback1
ip address 192.168.1.1 255.255.255.0
!
interface Loopback1
ip address 192.168.1.1 255.255.255.0
!
route-map CONNECTED permit 10
match interface Loopback1
!
router ospf 1
router-id 1.1.1.1
log-adjacency-changes
redistribute connected subnets route-map CONNECTED
network 10.1.12.1 0.0.0.0 area 0
network 10.1.13.1 0.0.0.0 area 1
network 172.16.101.1 0.0.0.0 area 0
match interface Loopback1
!
router ospf 1
router-id 1.1.1.1
log-adjacency-changes
redistribute connected subnets route-map CONNECTED
network 10.1.12.1 0.0.0.0 area 0
network 10.1.13.1 0.0.0.0 area 1
network 172.16.101.1 0.0.0.0 area 0
!
Verification:
Pic. 2 - R2 Receives External E2 Prefix.
Task 2On R5 create a new loopback interface with IP address 192.168.5.5/24. Advertise this network as external E2 into OSPF domain.
R5 Configuration:
!
interface Loopback1
ip address 192.168.5.5 255.255.255.0
ip address 192.168.5.5 255.255.255.0
!
router ospf 1
router-id 5.5.5.5
log-adjacency-changes
redistribute connected subnets
network 10.1.35.5 0.0.0.0 area 1
network 172.16.105.5 0.0.0.0 area 1
router-id 5.5.5.5
log-adjacency-changes
redistribute connected subnets
network 10.1.35.5 0.0.0.0 area 1
network 172.16.105.5 0.0.0.0 area 1
!
Verification:
Pic. 3 - R6 Receives External E2 Prefixes.
Configure routers in area 1 so they do not accept any external and inter-area prefixes. Routers in area 1 must be able to reach the newly created networks. Routers in area 2 should be able to reach these networks as well.
Note!
Area 1 must filter LSA5 but also introduces external prefixes (192.168.5.0/24, 192.168.5.0/24). Area 1 CANNOT be configured as totally stubby area then. NSSA totally stub area is the solution. ABR will inject a default route into area that is NSSA totally stubby area (default behavior).
R1 Configuration:
!
router ospf 1
router-id 1.1.1.1
log-adjacency-changes
area 1 nssa no-summary
redistribute connected subnets route-map CONNECTED
network 10.1.12.1 0.0.0.0 area 0
network 10.1.13.1 0.0.0.0 area 1
network 172.16.101.1 0.0.0.0 area 0
router-id 1.1.1.1
log-adjacency-changes
area 1 nssa no-summary
redistribute connected subnets route-map CONNECTED
network 10.1.12.1 0.0.0.0 area 0
network 10.1.13.1 0.0.0.0 area 1
network 172.16.101.1 0.0.0.0 area 0
!
R3 Configuration:
!
router ospf 1
router-id 3.3.3.3
log-adjacency-changes
area 1 nssa
network 0.0.0.0 255.255.255.255 area 1
router-id 3.3.3.3
log-adjacency-changes
area 1 nssa
network 0.0.0.0 255.255.255.255 area 1
!
R5 Configuration:
!
router ospf 1
router-id 5.5.5.5
log-adjacency-changes
area 1 nssa
redistribute connected subnets
network 10.1.35.5 0.0.0.0 area 1
network 172.16.105.5 0.0.0.0 area 1
router-id 5.5.5.5
log-adjacency-changes
area 1 nssa
redistribute connected subnets
network 10.1.35.5 0.0.0.0 area 1
network 172.16.105.5 0.0.0.0 area 1
!
Verification:
Pic. 4 - R5's Routing Table.
Pic. 5 - R3's Routing Table.
Pic. 6 - R1's Routing Table.
Final ping tests.
Pic. 7 - Ping Between R5 and R1 NSSA Prefixes.
Pic. 8 - R6's Routing Table.
Both prefixes show as LSA5 in the area 2.
Pic. 9 - R6 Pings Both Networks.
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