CCNP experiment: tunneling technology solves the problem of OSPF region segmentation

[Experimental environment] veryhuo.com

C3640-IK9O3S-M Version 12.4 (10) veryhuo.com

[PURPOSE]

Fire Network

The tunneling technology solves the problem of OSPF region segmentation.

[Experiment topology]

Liehuo.net

Veryhuo.com

[Experiment description]

Liehuo.net

Area 2 is not directly connected to Area 0. By creating a tunnel interface on R1 and R2, R2 directly accesses Area 0 through a tunnel to solve the problem of Area segmentation. Veryhuo.com

[Tutorial] liehuo.net

1. Basic R1 Configuration

Liehuo.net

!
Interface Loopback0
Ip address 1.1.1.1 255.255.255.255
!
Interface Serial0/0
Ip address 12.0.0.1 255.255.255.0
Clock rate 64000
!
Router ospf 110
Router-id 1.1.1.1
Network 1.1.1.1 0.0.0.0 area 0
Network 12.0.0.0 0.0.0.255 area 1
! Liehuo.net

2. R2 basic configuration veryhuo.com

!
Interface Serial0/0
Ip address 12.0.0.2 255.255.255.0
!
Interface Serial0/1
Ip address 23.0.0.1 255.255.255.0
Clock rate 64000
!
Router ospf 110
Router-id 2.2.2.2
Network 12.0.0.0 0.0.0.255 area 1
Network 23.0.0.0 0.0.0.255 area 2
!

Veryhuo.com

3. R3 basic configuration veryhuo.com

!
Interface Loopback0
Ip address 3.3.3.3 255.255.255.255
!
Interface Serial0/1
Ip address 23.0.0.2 255.255.255.0
!
Router ospf 110
Router-id 3.3.3.3
Log-adjacency-changes
Network 3.3.3.3 0.0.0.0 area 2
Network 23.0.0.0 0.0.0.255 area 2
! Powerful fireworks

In this case, Area 2 cannot obtain route information because it is not directly connected to Area 0.

4. Create a tunnel interface on R1 pointing to R2 liehuo.net

// Create a tunnel interface with any interface id
Interface Tunnel1
// Set the logical address for the tunnel interface, which is in the same network segment as the Peer logical interface.
Ip address 192.168.1.1 255.255.255.0
// Set the tunnel source as a local Interface
Tunnel source 12.0.0.1
// Set the tunnel purpose as the peer interface
Tunnel destination 12.0.0.2 liehuo.net

5. Create a tunnel interface on R2 pointing to R1

Lie # fire # Network

Interface Tunnel1
Ip address 192.168.1.2 255.255.255.0
Tunnel source 12.0.0.2
Tunnel destination 12.0.0.1 liehuo.net

6. Test Tunnel

Lie-fire-network

// Ping the logic address of the Peer tunnel on R2. The tunnel can be created as long as there is a route between the tunnel source and the destination. In this case, R2 is directly attached to R1.
R2 # ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/33/84 MS fire net

7. On R2, the tunnel interface is declared as ospf area 0 strong # fire # Network

Router ospf 110
Network 192.168.1.0 0.0.0.255 area 0

8. Check the R1 route table and observe that Area 2 has changed to IA, which proves the conclusion above.
Strong & fire & Network

R1 # sh ip ro veryhuo.com

1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
3.0.0.0/32 is subnetted, 1 subnets
O ia 3.3.3.3 [110/129] via 12.0.0.2, 00:00:30, Serial0/0
23.0.0.0/24 is subnetted, 1 subnets
O ia 23.0.0.0 [110/128] via 12.0.0.2, 00:00:30, Serial0/0
12.0.0.0/24 is subnetted, 1 subnets
C 12.0.0.0 is directly connected, Serial0/0
C 192.168.1.0/24 is directly connected, Tunnel1 Fire Network

9. Check the R3 route table. Similarly, liehuo.net

R3 # sh ip ro le'fire' Network

3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
23.0.0.0/24 is subnetted, 1 subnets
C 23.0.0.0 is directly connected, Serial0/1
12.0.0.0/24 is subnetted, 1 subnets
O ia 12.0.0.0 [110/128] via 23.0.0.1, 00:00:46, Serial0/1
O ia 192.168.1.0/24 [110/11175] via 23.0.0.1, 00:00:46, Serial0/1 veryhuo.com

10. Modify the default bandwidth of the tunnel interface.

R1 # sh int tunnel 1
Tunnel1 is up, line protocol is up
Hardware is Tunnel
Internet address is 192.168.1.1/24
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
Reliability 255/255, txload 1/255, rxload 1/255
Encapsulation TUNNEL, loopback not set
Keepalive not set
Tunnel source 12.0.0.1, destination 12.0.0.2

Lie # fire # Network

The default tunnel interface bandwidth is only 9 Kbit. In actual applications, you can use the ip ospf cost under the interface to modify the measured value of veryhuo.com under ospf.

R1 (config) # int tunnel 1
R1 (config-if) # ip ospf cost 10 liehuo.net

R2 (config) # int tunnel 1
R2 (config-if) # ip ospf cost 10 veryhuo.com