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Example for Configuring Basic OSPF Functions
Networking Requirements
As shown in Figure 5-35, all routers run OSPF, and the entire AS is divided into three areas. Router A and Router B serve as ABRs to forward routes between areas.
After the configuration, each router should learn the routes from the AS to all network segments.
Configuration Roadmap
The configuration roadmap is as follows:
Enable OSPF on each router.
Specify network segments in different areas.
Procedure
- Configure an IP address for each interface.
# Configure RouterA.
<Huawei> system-view [Huawei] sysname RouterA [RouterA] interface gigabitethernet 1/0/0 [RouterA-GigabitEthernet1/0/0] ip address 192.168.0.1 24 [RouterA-GigabitEthernet1/0/0] quit [RouterA] interface gigabitethernet 2/0/0 [RouterA-GigabitEthernet2/0/0] ip address 192.168.1.1 24 [RouterA-GigabitEthernet2/0/0] quit
The configurations of RouterB, RouterC, RouterD, RouterE, and RouterF are similar to the configuration of RouterA, and are not mentioned here.
- Configure basic OSPF functions.
# Configure Router A.
[RouterA] router id 1.1.1.1 [RouterA] ospf [RouterA-ospf-1] area 0 [RouterA-ospf-1-area-0.0.0.0] network 192.168.0.0 0.0.0.255 [RouterA-ospf-1-area-0.0.0.0] quit [RouterA-ospf-1] area 1 [RouterA-ospf-1-area-0.0.0.1] network 192.168.1.0 0.0.0.255 [RouterA-ospf-1-area-0.0.0.1] quit [RouterA-ospf-1] quit
# Configure Router B.
[RouterB] router id 2.2.2.2 [RouterB] ospf [RouterB-ospf-1] area 0 [RouterB-ospf-1-area-0.0.0.0] network 192.168.0.0 0.0.0.255 [RouterB-ospf-1-area-0.0.0.0] quit [RouterB-ospf-1] area 2 [RouterB-ospf-1-area-0.0.0.2] network 192.168.2.0 0.0.0.255 [RouterB-ospf-1-area-0.0.0.2] quit [RouterB-ospf-1] quit
# Configure Router C.
[RouterC] router id 3.3.3.3 [RouterC] ospf [RouterC-ospf-1] area 1 [RouterC-ospf-1-area-0.0.0.1] network 192.168.1.0 0.0.0.255 [RouterC-ospf-1-area-0.0.0.1] network 172.16.1.0 0.0.0.255 [RouterC-ospf-1-area-0.0.0.1] quit [RouterC-ospf-1] quit
# Configure Router D.
[RouterD] router id 4.4.4.4 [RouterD] ospf [RouterD-ospf-1] area 2 [RouterD-ospf-1-area-0.0.0.2] network 192.168.2.0 0.0.0.255 [RouterD-ospf-1-area-0.0.0.2] network 172.17.1.0 0.0.0.255 [RouterD-ospf-1-area-0.0.0.2] quit [RouterD-ospf-1] quit
# Configure Router E.
[RouterE] router id 5.5.5.5 [RouterE] ospf [RouterE-ospf-1] area 1 [RouterE-ospf-1-area-0.0.0.1] network 172.16.1.0 0.0.0.255 [RouterE-ospf-1-area-0.0.0.1] quit [RouterE-ospf-1] quit
# Configure Router F.
[RouterF] router id 6.6.6.6 [RouterF] ospf [RouterF-ospf-1] area 2 [RouterF-ospf-1-area-0.0.0.2] network 172.17.1.0 0.0.0.255 [RouterF-ospf-1-area-0.0.0.2] quit [RouterF-ospf-1] quit
- Verify the configuration.
# View OSPF neighbors of Router A.
[RouterA] display ospf peerOSPF Process 1 with Router ID 1.1.1.1 Neighbors Area 0.0.0.0 interface 192.168.0.1(GigabitEthernet1/0/0)'s neighbors Router ID: 2.2.2.2 Address: 192.168.0.2 State: Full Mode:Nbr is Master Priority: 1 DR: 192.168.0.2 BDR: 192.168.0.1 MTU: 0 Dead timer due in 36 sec Retrans timer interval: 5 Neighbor is up for 00:15:04 Authentication Sequence: [ 0 ] Neighbors Area 0.0.0.1 interface 192.168.1.1(GigabitEthernet2/0/0)'s neighbors Router ID: 3.3.3.3 Address: 192.168.1.2 State: Full Mode:Nbr is Master Priority: 1 DR: 192.168.1.2 BDR: 192.168.1.1 MTU: 0 Dead timer due in 39 sec Retrans timer interval: 5 Neighbor is up for 00:07:32 Authentication Sequence: [ 0 ]# View the OSPF routing information of Router A.
[RouterA] display ospf routingOSPF Process 1 with Router ID 1.1.1.1 Routing Tables Routing for Network Destination Cost Type NextHop AdvRouter Area 172.16.1.0/24 2 Transit 192.168.1.2 3.3.3.3 0.0.0.1 172.17.1.0/24 3 Inter-area 192.168.0.2 2.2.2.2 0.0.0.0 192.168.0.0/24 1 Transit 192.168.0.1 1.1.1.1 0.0.0.0 192.168.1.0/24 1 Transit 192.168.1.1 1.1.1.1 0.0.0.1 192.168.2.0/24 2 Inter-area 192.168.0.2 2.2.2.2 0.0.0.0 Total Nets: 5 Intra Area: 3 Inter Area: 2 ASE: 0 NSSA: 0# View the LSDB of Router A.
[RouterA] display ospf lsdbOSPF Process 1 with Router ID 1.1.1.1 Link State Database Area: 0.0.0.0 Type LinkState ID AdvRouter Age Len Sequence Metric Router 2.2.2.2 2.2.2.2 317 48 80000003 1 Router 1.1.1.1 1.1.1.1 316 48 80000002 1 Network 192.168.0.2 2.2.2.2 399 32 800000F8 0 Sum-Net 172.16.1.0 1.1.1.1 250 28 80000001 2 Sum-Net 172.17.1.0 2.2.2.2 203 28 80000001 2 Sum-Net 192.168.2.0 2.2.2.2 237 28 80000002 1 Sum-Net 192.168.1.0 1.1.1.1 295 28 80000002 1 Area: 0.0.0.1 Type LinkState ID AdvRouter Age Len Sequence Metric Router 5.5.5.5 5.5.5.5 214 36 80000004 1 Router 3.3.3.3 3.3.3.3 217 60 80000008 1 Router 1.1.1.1 1.1.1.1 289 48 80000002 1 Network 192.168.1.1 1.1.1.1 202 28 80000002 0 Network 172.16.1.1 3.3.3.3 670 32 80000001 0 Sum-Net 172.17.1.0 1.1.1.1 202 28 80000001 3 Sum-Net 192.168.2.0 1.1.1.1 242 28 80000001 2 Sum-Net 192.168.0.0 1.1.1.1 300 28 80000001 1# View the routing table of Router D and test connectivity by using the ping command.
[RouterD] display ospf routingOSPF Process 1 with Router ID 4.4.4.4 Routing Tables Routing for Network Destination Cost Type NextHop AdvRouter Area 172.16.1.0/24 4 Inter-area 192.168.2.1 2.2.2.2 0.0.0.2 172.17.1.0/24 1 Transit 172.17.1.1 4.4.4.4 0.0.0.2 192.168.0.0/24 2 Inter-area 192.168.2.1 2.2.2.2 0.0.0.2 192.168.1.0/24 3 Inter-area 192.168.2.1 2.2.2.2 0.0.0.2 192.168.2.0/24 1 Transit 192.168.2.2 4.4.4.4 0.0.0.2 Total Nets: 5 Intra Area: 2 Inter Area: 3 ASE: 0 NSSA: 0 [RouterD] ping 172.16.1.1 PING 172.16.1.1: 56 data bytes, press CTRL_C to break Reply from 172.16.1.1: bytes=56 Sequence=1 ttl=253 time=62 ms Reply from 172.16.1.1: bytes=56 Sequence=2 ttl=253 time=16 ms Reply from 172.16.1.1: bytes=56 Sequence=3 ttl=253 time=62 ms Reply from 172.16.1.1: bytes=56 Sequence=4 ttl=253 time=94 ms Reply from 172.16.1.1: bytes=56 Sequence=5 ttl=253 time=63 ms --- 172.16.1.1 ping statistics --- 5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 16/59/94 ms
Configuration Files
Configuration file of Router A
# sysname RouterA # router id 1.1.1.1 # interface GigabitEthernet1/0/0 ip address 192.168.0.1 255.255.255.0 # interface GigabitEthernet2/0/0 ip address 192.168.1.1 255.255.255.0 # ospf 1 area 0.0.0.0 network 192.168.0.0 0.0.0.255 area 0.0.0.1 network 192.168.1.0 0.0.0.255 # return
Configuration file of Router B
# sysname RouterB # router id 2.2.2.2 # interface GigabitEthernet1/0/0 ip address 192.168.0.2 255.255.255.0 # interface GigabitEthernet2/0/0 ip address 192.168.2.1 255.255.255.0 # ospf 1 area 0.0.0.0 network 192.168.0.0 0.0.0.255 area 0.0.0.2 network 192.168.2.0 0.0.0.255 # return
Configuration file of Router C
# sysname RouterC # router id 3.3.3.3 # interface GigabitEthernet1/0/0 ip address 192.168.1.2 255.255.255.0 # interface GigabitEthernet2/0/0 ip address 172.16.1.1 255.255.255.0 # ospf 1 area 0.0.0.1 network 192.168.1.0 0.0.0.255 network 172.16.1.0 0.0.0.255 # return
Configuration file of Router D
# sysname RouterD # router id 4.4.4.4 # interface GigabitEthernet1/0/0 ip address 192.168.2.2 255.255.255.0 # interface GigabitEthernet2/0/0 ip address 172.17.1.1 255.255.255.0 # ospf 1 area 0.0.0.2 network 192.168.2.0 0.0.0.255 network 172.17.1.0 0.0.0.255 # return
Configuration file of Router E
# sysname RouterE # router id 5.5.5.5 # interface GigabitEthernet2/0/0 ip address 172.16.1.2 255.255.255.0 # ospf 1 area 0.0.0.1 network 172.16.1.0 0.0.0.255 # return
Configuration file of Router F
# sysname RouterF # router id 6.6.6.6 # interface GigabitEthernet2/0/0 ip address 172.17.1.2 255.255.255.0 # ospf 1 area 0.0.0.2 network 172.17.1.0 0.0.0.255 # return
