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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Example for Configuring OSPF Virtual Links

Example for Configuring OSPF Virtual Links

Networking Requirements

As shown in Figure 5-36, Area 2 does not connect to the backbone area directly. Area 1 serves as a transit area to connect Area 2 and Area 0. A virtual link is configured between Router A and Router B.

Figure 5-36 Configuring OSPF virtual links

Configuration Roadmap

The configuration roadmap is as follows:

  1. Configure basic OSPF functions on each router.

  2. Configure virtual connections on Router A and Router B to connect the backbone area with the non-backbone area.

Procedure

  1. Configure an IP address for each interface.

    # Configure Router A.

    <Huawei> system-view
    [Huawei] sysname RouterA
    [RouterA] interface gigabitethernet 1/0/0
    [RouterA-GigabitEthernet1/0/0] ip address 192.168.1.1 24
    [RouterA-GigabitEthernet1/0/0] quit
    [RouterA] interface gigabitethernet 2/0/0
    [RouterA-GigabitEthernet2/0/0] ip address 10.1.1.1 8
    [RouterA-GigabitEthernet2/0/0] quit

    The configurations of Router B, Router C, Router D, Router E, and Router F are similar to the configuration of Router A, and are not mentioned here.

  2. Configure basic OSPF functions.

    # Configure Router A.

    [RouterA] ospf 1 router-id 1.1.1.1 
    [RouterA-ospf-1] area 0
    [RouterA-ospf-1-area-0.0.0.0] network 10.0.0.0 0.255.255.255 
    [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

    # Configure Router B.

    [RouterB] ospf 1 router-id 2.2.2.2
    [RouterB-ospf-1] area 1
    [RouterB-ospf-1-area-0.0.0.1] network 192.168.1.0 0.0.0.255 
    [RouterB-ospf-1-area-0.0.0.1] quit
    [RouterB-ospf-1] area 2
    [RouterB-ospf-1-area-0.0.0.2] network 172.16.0.0 0.0.255.255
    [RouterB-ospf-1-area-0.0.0.2] quit

    # Configure Router C.

    [RouterC] ospf 1 router-id 3.3.3.3 
    [RouterC-ospf-1] area 0
    [RouterC-ospf-1-area-0.0.0.0] network 10.0.0.0 0.255.255.255 
    [RouterC-ospf-1-area-0.0.0.0] quit

    # Configure Router D.

    [RouterD] ospf 1 router-id 4.4.4.4
    [RouterD-ospf-1] area 2
    [RouterD-ospf-1-area-0.0.0.2] network 172.16.0.0 0.0.255.255
    [RouterD-ospf-1-area-0.0.0.2] quit

    # View the OSPF routing table of Router A.

    The routing table of Router A does not contain routes in Area 2 because Area 2 is not directly connected to Area 0.

    [RouterA] display ospf routing
              OSPF Process 1 with Router ID 1.1.1.1
                       Routing Tables
     Routing for Network
     Destination        Cost  Type       NextHop         AdvRouter       Area
     10.0.0.0/8         1  Transit       10.1.1.1        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
     Total Nets: 2
     Intra Area: 2  Inter Area: 0  ASE: 0  NSSA: 0

  3. Configure virtual links.

    # Configure Router A.

    [RouterA] ospf 1
    [RouterA-ospf-1] area 1
    [RouterA-ospf-1-area-0.0.0.1] vlink-peer 2.2.2.2
    [RouterA-ospf-1-area-0.0.0.1] quit
    [RouterA-ospf-1] quit

    # Configure Router B.

    [RouterB] ospf 1
    [RouterB-ospf-1] area 1
    [RouterB-ospf-1-area-0.0.0.1] vlink-peer 1.1.1.1 
    [RouterB-ospf-1-area-0.0.0.1] quit
    [RouterB-ospf-1] quit

  4. Verify the configuration.

    # View the OSPF routing table of Router A.

    [RouterA] display ospf routing
              OSPF Process 1 with Router ID 1.1.1.1
                       Routing Tables
     Routing for Network
     Destination        Cost  Type       NextHop         AdvRouter       Area
     172.16.0.0/16      2   Inter-area 192.168.1.2        2.2.2.2         0.0.0.2
     10.0.0.0/8         1   Transit       10.1.1.1        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
     Total Nets: 3
     Intra Area: 2  Inter Area: 1  ASE: 0  NSSA: 0

Configuration Files

  • Configuration file of Router A

    #
     sysname RouterA
    #
    interface GigabitEthernet1/0/0
     ip address 192.168.1.1 255.255.255.0
    #
    interface GigabitEthernet2/0/0
     ip address 10.1.1.1 255.0.0.0
    #
    ospf 1 router-id 1.1.1.1
     area 0.0.0.0
      network 10.0.0.0 0.255.255.255
     area 0.0.0.1
      network 192.168.1.0 0.0.0.255
      vlink-peer 2.2.2.2
    #
    return

  • Configuration file of Router B

    #
     sysname RouterB
    #
    interface GigabitEthernet1/0/0
     ip address 192.168.1.2 255.255.255.0
    #
    interface GigabitEthernet2/0/0
     ip address 172.16.1.1 255.255.0.0
    #
    ospf 1 router-id 2.2.2.2
     area 0.0.0.1
      network 192.168.1.0 0.0.0.255
      vlink-peer 1.1.1.1
     area 0.0.0.2
      network 172.16.0.0 0.0.255.255
    #
    return

  • Configuration file of Router C

    #
     sysname RouterC
    #
    interface GigabitEthernet2/0/0
     ip address 10.1.1.2 255.0.0.0
    #
    ospf 1 router-id 3.3.3.3
     area 0.0.0.0
      network 10.0.0.0 0.255.255.255
    #
    return

  • Configuration file of Router D

    #
     sysname RouterD
    #
    interface GigabitEthernet2/0/0
     ip address 172.16.1.2 255.255.0.0
    #
    ospf 1 router-id 4.4.4.4
     area 0.0.0.2
      network 172.16.0.0 0.0.255.255
    #
    return
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Updated: 2019-12-27

Document ID: EDOC1000174069

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