Configure OSPF Over Frame Relay

Agar semua IP bisa diping (semua bisa berkomunikasi), selain daripada routing static, seperti yang sudah dibahas sebeumnya, kita bisa menggunakan routing dynamic, misalnya OSPF. Tidak seperti pada jaringan pada umumnya, di frame relay, OSPF tidak bisa lewat jika tidak dikonfigurasi secara jelas neigbor-nya.

Ok, mari kita coba. Tinggal ditambahkan saja konfigurasi OSPFnya. (Lihat konfigurasi sebelumnya di sini).

Router R1

R1#config ter

Enter configuration commands, one per line.  End with CNTL/Z.

R1(config)#router ospf 11

R1(config-router)#netw 10.11.11.0 0.0.0.255 area 5

R1(config-router)#netw 1.1.1.1 0.0.0.0 area 5

R1(config-router)#netw 10.2.34.0 0.0.0.7 area 5

R1(config-router)#neig 10.2.34.2

R1(config-router)#neig 10.2.34.3

R1(config-router)#neig 10.2.34.4

R1(config-router)#do wr

Warning: Attempting to overwrite an NVRAM configuration previously written

by a different version of the system image.

Overwrite the previous NVRAM configuration?[confirm]

Building configuration...

[OK]

R1(config-router)#do copy run start

Destination filename [startup-config]?

Building configuration...

[OK]

Router R2

R2#config ter

Enter configuration commands, one per line.  End with CNTL/Z.

R2(config)#router ospf 22

R2(config-router)# network 2.2.2.2 0.0.0.0 area 5

R2(config-router)# network 10.2.34.0 0.0.0.7 area 5

R2(config-router)# network 10.22.22.0 0.0.0.255 area 5

R2(config-router)#neig 10.2.34.1

R2(config-router)#neig 10.2.34.3

R2(config-router)#neig 10.2.34.4

Router R3

R3#config ter

Enter configuration commands, one per line.  End with CNTL/Z.

R3(config)#router ospf 33

R3(config-router)#netw 10.33.33.0 0.0.0.255 area 5

R3(config-router)#netw 3.3.3.3 0.0.0.0 area 5

R3(config-router)#netw 10.2.34.0 0.0.0.7 area 5

R3(config-router)#neig 10.2.34.1

R3(config-router)#neig 10.2.34.2

R3(config-router)#neig 10.2.34.4

Router R4

R4#config ter

Enter configuration commands, one per line.  End with CNTL/Z.

R4(config)#router ospf 44

R4(config-router)#netw 10.44.44.0 0.0.0.255 area 5

R4(config-router)#netw 4.4.4.4 0.0.0.0 area 5

R4(config-router)#netw 10.2.34.0 0.0.0.7 area 5

R4(config-router)#neig 10.2.34.1

R4(config-router)#neig 10.2.34.2

R4(config-router)#neig 10.2.34.3

Dan hasilnya

R1

R1#sh ip ospf neig

Neighbor ID     Pri   State           Dead Time   Address         Interface

2.2.2.2           1   FULL/DROTHER    00:01:35    10.2.34.2       Serial0/0

3.3.3.3           1   FULL/DROTHER    00:01:43    10.2.34.3       Serial0/0

4.4.4.4           1   FULL/BDR        00:01:43    10.2.34.4       Serial0/0

R2

R2#sh ip ospf neig

Neighbor ID     Pri   State           Dead Time   Address         Interface

1.1.1.1           1   FULL/DR         00:01:52    10.2.34.1       Serial0/0

3.3.3.3           1   2WAY/DROTHER    00:01:56    10.2.34.3       Serial0/0

4.4.4.4           1   FULL/BDR        00:01:56    10.2.34.4       Serial0/0

R3

R3#sh ip ospf neig

Neighbor ID     Pri   State           Dead Time   Address         Interface

1.1.1.1           1   FULL/DR         00:01:50    10.2.34.1       Serial0/0

2.2.2.2           1   2WAY/DROTHER    00:01:43    10.2.34.2       Serial0/0

4.4.4.4           1   FULL/BDR        00:01:58    10.2.34.4       Serial0/0

R4

R4#sh ip ospf neig

Neighbor ID     Pri   State           Dead Time   Address         Interface

2.2.2.2           1   FULL/DROTHER    00:01:35    10.2.34.2       Serial0/0

3.3.3.3           1   FULL/DROTHER    00:01:45    10.2.34.3       Serial0/0

1.1.1.1           1   FULL/DR         00:01:43    10.2.34.1       Serial0/0

Dari router R1, kita lihat ip route-nya.

R1#sh ip route

Codes: 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

Gateway of last resort is not set

     1.0.0.0/32 is subnetted, 1 subnets

C       1.1.1.1 is directly connected, Loopback0

     2.0.0.0/32 is subnetted, 1 subnets

O       2.2.2.2 [110/65] via 10.2.34.2, 00:02:01, Serial0/0

     3.0.0.0/32 is subnetted, 1 subnets

O       3.3.3.3 [110/65] via 10.2.34.3, 00:02:01, Serial0/0

     4.0.0.0/32 is subnetted, 1 subnets

O       4.4.4.4 [110/65] via 10.2.34.4, 00:02:11, Serial0/0

     10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

O       10.44.44.0/24 [110/65] via 10.2.34.4, 00:02:11, Serial0/0

O       10.33.33.0/24 [110/65] via 10.2.34.3, 00:02:03, Serial0/0

O       10.22.22.0/24 [110/74] via 10.2.34.2, 00:02:03, Serial0/0

C       10.11.11.0/24 is directly connected, Ethernet0/0

C       10.2.34.0/29 is directly connected, Serial0/0

Ok. Untuk memastikan, semua PC client disetting IP addressnya, seharusnya akan bisa ping ke semuanya.

Ok. it really... really work... :)

Noted.

Dynamic Mapping

R4#sh frame-relay map

Serial0/0 (up): ip 10.2.34.1 dlci 401(0x191,0x6410), dynamic,

              broadcast,

              CISCO, status defined, active

Ini yang disebut mapping secara dinamis, dimana Frame Relay Switch melakukan inverse-arp untuk memapping IP address dengan DLCI. Bisa juga kita buat mapping static, seperti konfigurasi di bawah ini.

R4(config)#inter serial0/0

R4(config-if)#frame-relay interface-dlci 401

R4(config-fr-dlci)#exit

R4(config-if)#frame-relay map ip 10.2.34.1 401 broadcast

And hasilnya.

R4#sh frame-relay map

Serial0/0 (up): ip 10.2.34.1 dlci 401(0x191,0x6410), static,

              broadcast,

              CISCO, status defined, active