Drawing; virtual link the OSPF

Drawing; virtual link the OSPF

Artwork below

Draw

Lab topology

Experimental demand

OSPF configuration according to figure subregions
arranged virtual connection authentication

Experimental Procedure

1. Configure the IP addresses and port addresses run loopback
2. OSPF configuration according to figure subregion
   AR1

[Huawei]ospf router-id 1.1.1.1
[Huawei-ospf-1]area 0
[Huawei-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0
[Huawei-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255

AR2

[Huawei]ospf router-id 2.2.2.2
[Huawei-ospf-1]area 0
[Huawei-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[Huawei-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[Huawei-ospf-1]area 1
[Huawei-ospf-1-area-0.0.0.1]network 30.1.1.0 0.0.0.255

AR3

[Huawei]ospf router-id 3.3.3.3
[Huawei-ospf-1]area 1
[Huawei-ospf-1-area-0.0.0.1]network 3.3.3.3 0.0.0.0
[Huawei-ospf-1-area-0.0.0.1]network 30.1.1.0 0.0.0.255
[Huawei-ospf-1]area 2
[Huawei-ospf-1-area-0.0.0.1]network 40.1.1.0 0.0.0.255

AR4

[Huawei]ospf router-id 4.4.4.4
[Huawei-ospf-1]area 2
[Huawei-ospf-1-area-0.0.0.1]network 4.4.4.4 0.0.0.0
[Huawei-ospf-1-area-0.0.0.1]network 40.1.1.0 0.0.0.255

Test connectivity AR1 PING AR3

[Huawei]ping 3.3.3.3
  PING 3.3.3.3: 56  data bytes, press CTRL_C to break
    Reply from 3.3.3.3: bytes=56 Sequence=1 ttl=254 time=20 ms
    Reply from 3.3.3.3: bytes=56 Sequence=2 ttl=254 time=20 ms
    Reply from 3.3.3.3: bytes=56 Sequence=3 ttl=254 time=30 ms
    Reply from 3.3.3.3: bytes=56 Sequence=4 ttl=254 time=40 ms
    Reply from 3.3.3.3: bytes=56 Sequence=5 ttl=254 time=40 ms

  --- 3.3.3.3 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 20/30/40 ms

Configure a virtual link

ospf non-backbone areas and backbone area must be connected to the communication, in order not to change the network topology, we can achieve virtual connection to expand the area of the region of 0 to achieve regional interoperability.
AR2

[Huawei-ospf-1-area-0.0.0.1]vlink-peer 3.3.3.3

AR3

[Huawei-ospf-1-area-0.0.0.1]vlink-peer 2.2.2.2

See virtual connections on AR3

After the completion of the neighbors is a link of P2P

[Huawei]dis ospf vlink 

     OSPF Process 1 with Router ID 3.3.3.3
         Virtual Links 

 Virtual-link Neighbor-id  -> 2.2.2.2, Neighbor-State: Full

 Interface: 30.1.1.2 (GigabitEthernet0/0/0)
 Cost: 1  State: P-2-P  Type: Virtual 
 Transit Area: 0.0.0.1 
 Timers: Hello 10 , Dead 40 , Retransmit 5 , Transmit Delay 1 
 GR State: Normal 

AR1 PING AR4

[Huawei]ping 4.4.4.4
  PING 4.4.4.4: 56  data bytes, press CTRL_C to break
    Reply from 4.4.4.4: bytes=56 Sequence=1 ttl=253 time=40 ms
    Reply from 4.4.4.4: bytes=56 Sequence=2 ttl=253 time=40 ms
    Reply from 4.4.4.4: bytes=56 Sequence=3 ttl=253 time=30 ms
    Reply from 4.4.4.4: bytes=56 Sequence=4 ttl=253 time=30 ms
    Reply from 4.4.4.4: bytes=56 Sequence=5 ttl=253 time=30 ms

  --- 4.4.4.4 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 30/34/40 ms

Virtual connections do certification

AR2

[Huawei-ospf-1-area-0.0.0.1]vlink-peer 3.3.3.3 simple cipher 123

AR3

[Huawei-ospf-1-area-0.0.0.1]vlink-peer 2.2.2.2 simple cipher 123

Test connectivity, AR4 PING AR1

<Huawei>ping 1.1.1.1
  PING 1.1.1.1: 56  data bytes, press CTRL_C to break
    Reply from 1.1.1.1: bytes=56 Sequence=1 ttl=253 time=40 ms
    Reply from 1.1.1.1: bytes=56 Sequence=2 ttl=253 time=30 ms
    Reply from 1.1.1.1: bytes=56 Sequence=3 ttl=253 time=40 ms
    Reply from 1.1.1.1: bytes=56 Sequence=4 ttl=253 time=30 ms
    Reply from 1.1.1.1: bytes=56 Sequence=5 ttl=253 time=50 ms

  --- 1.1.1.1 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 30/38/50 ms