Example for Configuring an OSPF Virtual Link

Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R011C10

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.

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Example for Configuring an OSPF Virtual Link

Networking Requirements

In Figure 5-74, the original OSPF network is divided into Area0 and Area1. Due to limitations of the existing network, Area2 needs to be planned and added to the entire OSPF network using SwitchB as an ABR.

Figure 5-74 Networking diagram of configuring an OSPF virtual link

Configuration Roadmap

The configuration roadmap is as follows:

Configure basic OSPF functions on each switch to implement reachable internal routes among Area0, Area1, and Area2.
Configure a virtual link between SwitchA and SwitchB to implement reachable routes between Area2 and other areas.

Procedure

Configure VLANs for interfaces.

# Configure SwitchA. The configurations of SwitchB, SwitchC, and SwitchD are similar to the configuration of SwitchA.

<HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan batch 10 20
[SwitchA] interface gigabitethernet 1/0/1
[SwitchA-GigabitEthernet1/0/1] port link-type trunk
[SwitchA-GigabitEthernet1/0/1] port trunk allow-pass vlan 10
[SwitchA-GigabitEthernet1/0/1] quit
[SwitchA] interface gigabitethernet 1/0/2
[SwitchA-GigabitEthernet1/0/2] port link-type trunk
[SwitchA-GigabitEthernet1/0/2] port trunk allow-pass vlan 20
[SwitchA-GigabitEthernet1/0/2] quit

Configure an IP address for each VLANIF interface.

# Configure SwitchA. The configurations of SwitchB, SwitchC, and SwitchD are similar to the configuration of SwitchA.

[SwitchA] interface vlanif 10
[SwitchA-Vlanif10] ip address 10.1.1.1 24
[SwitchA-Vlanif10] quit
[SwitchA] interface vlanif 20
[SwitchA-Vlanif20] ip address 192.168.1.1 24
[SwitchA-Vlanif20] quit

Configure basic OSPF functions.

# Configure SwitchA.

[SwitchA] ospf 1 router-id 10.10.10.1
[SwitchA-ospf-1] area 0
[SwitchA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0] quit
[SwitchA-ospf-1] area 1
[SwitchA-ospf-1-area-0.0.0.1] network 192.168.1.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.1] quit
[SwitchA-ospf-1] quit

# Configure SwitchB.

[SwitchB] ospf 1 router-id 10.10.10.2
[SwitchB-ospf-1] area 1
[SwitchB-ospf-1-area-0.0.0.1] network 192.168.1.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.1] quit
[SwitchB-ospf-1] area 2
[SwitchB-ospf-1-area-0.0.0.2] network 172.16.0.0 0.0.255.255
[SwitchB-ospf-1-area-0.0.0.2] quit
[SwitchB-ospf-1] quit

# Configure SwitchC.

[SwitchC] ospf 1 router-id 10.10.10.3 
[SwitchC-ospf-1] area 0
[SwitchC-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0] quit
[SwitchC-ospf-1] quit

# Configure SwitchD.

[SwitchD] ospf 1 router-id 10.10.10.4
[SwitchD-ospf-1] area 2
[SwitchD-ospf-1-area-0.0.0.2] network 172.16.0.0 0.0.255.255
[SwitchD-ospf-1-area-0.0.0.2] quit
[SwitchD-ospf-1] quit

# Check the OSPF routing table on SwitchA.

[SwitchA] display ospf routing

          OSPF Process 1 with Router ID 10.10.10.1
                   Routing Tables

 Routing for Network
 Destination        Cost  Type       NextHop         AdvRouter       Area
 10.1.1.0/24        1     Transit    10.1.1.1        10.10.10.1      0.0.0.0
 192.168.1.0/24     1     Transit    192.168.1.1     10.10.10.1      0.0.0.1

 Total Nets: 2
 Intra Area: 2  Inter Area: 0  ASE: 0  NSSA: 0

The preceding command output shows that the Area2 route information does not exist on SwitchA. OSPF requires that all non-backbone areas maintain the connectivity with the backbone area. Area2 is not directly connected to Area0; therefore, the routing table of SwitchA does not contain the routes in Area2.

Configure a virtual link.

# Configure SwitchA.

[SwitchA] ospf 1
[SwitchA-ospf-1] area 1
[SwitchA-ospf-1-area-0.0.0.1] vlink-peer 10.10.10.2
[SwitchA-ospf-1-area-0.0.0.1] quit
[SwitchA-ospf-1] quit

# Configure SwitchB.

[SwitchB] ospf 1
[SwitchB-ospf-1] area 1
[SwitchB-ospf-1-area-0.0.0.1] vlink-peer 10.10.10.1 
[SwitchB-ospf-1-area-0.0.0.1] quit
[SwitchB-ospf-1] quit

Verify the configuration.

# Check the OSPF routing table on SwitchA.

[SwitchA] display ospf routing

          OSPF Process 1 with Router ID 10.10.10.1
                   Routing Tables

 Routing for Network
 Destination        Cost  Type       NextHop         AdvRouter       Area
 10.1.1.0/24        1     Transit    10.1.1.1        10.10.10.1      0.0.0.0
 192.168.1.0/24     1     Transit    192.168.1.1     10.10.10.1      0.0.0.1
 172.16.0.0/16      2     Inter-area 192.168.1.2     10.10.10.2      0.0.0.0

 Total Nets: 3
 Intra Area: 2  Inter Area: 1  ASE: 0  NSSA: 0

The preceding command output shows that the OSPF routing table of SwitchA contains the routes in Area2 after the virtual link is configured between SwitchA and SwitchB.

Configuration Files

SwitchA configuration file

#
sysname SwitchA
#
vlan batch 10 20
#
interface Vlanif10
 ip address 10.1.1.1 255.255.255.0
#
interface Vlanif20
 ip address 192.168.1.1 255.255.255.0
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk allow-pass vlan 20
#
ospf 1 router-id 10.10.10.1
 area 0.0.0.0
  network 10.1.1.0 0.0.0.255
 area 0.0.0.1
  network 192.168.1.0 0.0.0.255
  vlink-peer 10.10.10.2
#
return

SwitchB configuration file

#
sysname SwitchB
#
vlan batch 20 30
#
interface Vlanif20
 ip address 192.168.1.2 255.255.255.0
#
interface Vlanif30
 ip address 172.16.1.1 255.255.0.0
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk allow-pass vlan 20
#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk allow-pass vlan 30
#
ospf 1 router-id 10.10.10.2
 area 0.0.0.1
  network 192.168.1.0 0.0.0.255
  vlink-peer 10.10.10.1
 area 0.0.0.2
  network 172.16.0.0 0.0.255.255
#
return

SwitchC configuration file

#
sysname SwitchC
#
vlan batch 10
#
interface Vlanif10
 ip address 10.1.1.2 255.255.255.0
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
ospf 1 router-id 10.10.10.3
 area 0.0.0.0
  network 10.1.1.0 0.0.0.255
#
return

SwitchD configuration file

#
sysname SwitchD
#
vlan batch 30
#
interface Vlanif30
 ip address 172.16.1.2 255.255.0.0
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk allow-pass vlan 30
#
ospf 1 router-id 10.10.10.4
 area 0.0.0.2
  network 172.16.0.0 0.0.255.255
#
return

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Updated: 2020-12-08

Document ID: EDOC1000178324

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This Document Applies to these Products

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.

Networking Requirements

Configuration Roadmap

Procedure

Configuration Files

Related Version

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