OSPF Point-to-Point Network Type ( Sub-Interface)

This post is the final series of the OSPF Network type focusing on understanding Point-to-Point network types.

OBJECTIVE:

1. To understand concepts about Point-to-Point OSPF Network type.
2. Determine the steps required to configure Point-to-Point OSPF Network Type.
3. Determine the deployment methods on Point-To-Point OSPF Network Type.

On this post, I will be showing the first options as mentioned above. The first option will be deployment with different sets of IP segments per PVC. Again, I am using Frame-Relay as my layer 2 protocol in this example. I just wanted to learned more before diving into other protocols like DMVPN to get familiarity of the technology for sure, you will see post about this in the future. So here is my GNS3 topology.

So here are my router configurations:

MANILA Router:

MANILA#sh run int s2/0
Building configuration…

Current configuration : 69 bytes
!
interface Serial2/0
no ip address
encapsulation frame-relay
end

MANILA#sh run int s2/0.12
Building configuration…

Current configuration : 119 bytes
!
interface Serial2/0.12 point-to-point
ip address 192.168.12.1 255.255.255.0
frame-relay interface-dlci 101
end

MANILA#sh run int s2/0.13
Building configuration…

Current configuration : 119 bytes
!
interface Serial2/0.13 point-to-point
ip address 192.168.13.1 255.255.255.0
frame-relay interface-dlci 102
end

MANILA#sh run int lo0
Building configuration…

Current configuration : 64 bytes
!
interface Loopback0
ip address 10.10.10.1 255.255.255.0
end

OSPF Configurations:

MANILA#sh run | sec ospf
router ospf 1
network 10.10.10.0 0.0.0.255 area 0
network 192.168.12.0 0.0.0.255 area 0
network 192.168.13.0 0.0.0.255 area 0
MANILA#

MELBOURNE Router:

MELBOURNE#sh run int s2/0
Building configuration…

Current configuration : 69 bytes
!
interface Serial2/0
no ip address
encapsulation frame-relay
end

MELBOURNE#sh run int s2/0.21
Building configuration…

Current configuration : 119 bytes
!
interface Serial2/0.21 point-to-point
ip address 192.168.12.2 255.255.255.0
frame-relay interface-dlci 202
end

MELBOURNE#sh run int lo0
Building configuration…

Current configuration : 64 bytes
!
interface Loopback0
ip address 20.20.20.1 255.255.255.0
end

MELBOURNE#sh run | sec ospf
router ospf 1
network 20.20.20.0 0.0.0.255 area 0
network 192.168.12.0 0.0.0.255 area 0
MELBOURNE#

SINGAPORE Router:

SINGAPORE#sh run int s2/0
Building configuration…

Current configuration : 69 bytes
!
interface Serial2/0
no ip address
encapsulation frame-relay
end

SINGAPORE#sh run int s2/0.31
Building configuration…

Current configuration : 119 bytes
!
interface Serial2/0.31 point-to-point
ip address 192.168.13.3 255.255.255.0
frame-relay interface-dlci 203
end

SINGAPORE#sh run int lo0
Building configuration…

Current configuration : 64 bytes
!
interface Loopback0
ip address 30.30.30.1 255.255.255.0
end

SINGAPORE#sh run | sec ospf
router ospf 1
network 30.30.30.0 0.0.0.255 area 0
network 192.168.12.0 0.0.0.255 area 0
network 192.168.13.0 0.0.0.255 area 0
SINGAPORE#

VERIFICATION:

Now , lets verify our configurations based on the desired results whether we have achieved the objectives.

A. OSPF Neighbor Status

MANILA#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
30.30.30.1        0   FULL/ –        00:00:37    192.168.13.3    Serial2/0.13
20.20.20.1        0   FULL/ –        00:00:38    192.168.12.2    Serial2/0.12
MANILA#

MELBOURNE#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
10.10.10.1 0 FULL/ – 00:00:32 192.168.12.1 Serial2/0.21
MELBOURNE#

SINGAPORE#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
10.10.10.1 0 FULL/ – 00:00:38 192.168.13.1 Serial2/0.31
SINGAPORE#

B. ROUTING Table entries

MANILA#show ip route ospf
Codes: L – local, C – connected, S – static, R – RIP, M – mobile, B – BGP
       D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
       N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2
       E1 – OSPF external type 1, E2 – OSPF external type 2
       i – IS-IS, su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
       ia – IS-IS inter area, * – candidate default, U – per-user static route
       o – ODR, P – periodic downloaded static route, H – NHRP, l – LISP
       + – replicated route, % – next hop override

Gateway of last resort is not set

      20.0.0.0/32 is subnetted, 1 subnets
O        20.20.20.1 [110/65] via 192.168.12.2, 00:13:48, Serial2/0.12
      30.0.0.0/32 is subnetted, 1 subnets
O        30.30.30.1 [110/65] via 192.168.13.3, 00:10:48, Serial2/0.13
MANILA#

MELBOURNE#show ip route ospf
Codes: L – local, C – connected, S – static, R – RIP, M – mobile, B – BGP
       D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
       N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2
       E1 – OSPF external type 1, E2 – OSPF external type 2
       i – IS-IS, su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
       ia – IS-IS inter area, * – candidate default, U – per-user static route
       o – ODR, P – periodic downloaded static route, H – NHRP, l – LISP
       + – replicated route, % – next hop override

Gateway of last resort is not set

      10.0.0.0/32 is subnetted, 1 subnets
O        10.10.10.1 [110/65] via 192.168.12.1, 00:14:02, Serial2/0.21
      30.0.0.0/32 is subnetted, 1 subnets
O        30.30.30.1 [110/129] via 192.168.12.1, 00:11:02, Serial2/0.21
O     192.168.13.0/24 [110/128] via 192.168.12.1, 00:11:23, Serial2/0.21
MELBOURNE#

SINGAPORE#show ip route ospf
Codes: L – local, C – connected, S – static, R – RIP, M – mobile, B – BGP
       D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
       N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2
       E1 – OSPF external type 1, E2 – OSPF external type 2
       i – IS-IS, su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
       ia – IS-IS inter area, * – candidate default, U – per-user static route
       o – ODR, P – periodic downloaded static route, H – NHRP, l – LISP
       + – replicated route, % – next hop override

Gateway of last resort is not set

      10.0.0.0/32 is subnetted, 1 subnets
O        10.10.10.1 [110/65] via 192.168.13.1, 00:11:28, Serial2/0.31
      20.0.0.0/32 is subnetted, 1 subnets
O        20.20.20.1 [110/129] via 192.168.13.1, 00:11:28, Serial2/0.31
O     192.168.12.0/24 [110/128] via 192.168.13.1, 00:11:28, Serial2/0.31
SINGAPORE#

>>> As expected, both MELBOURNE & SINGAPORE routers should have three OSPF routes.

C. Connectivity Test

SINGAPORE#ping 20.20.20.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.20.20.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 52/56/60 ms

SINGAPORE#traceroute 20.20.20.1
Type escape sequence to abort.
Tracing the route to 20.20.20.1
VRF info: (vrf in name/id, vrf out name/id)
1 192.168.13.1 56 msec 60 msec 56 msec
2 192.168.12.2 56 msec 56 msec 52 msec
SINGAPORE#

>> As seen, we have connectivity between the two networks (Singapore to Melbourne) via the MANILA router.

NETWORK LESSON