Multi-region OSPF

Multi-region OSPF

I. Tutorial Purpose

Learn to configure multi-region OSPF and configure virtual links

 

Ii. Experiment Topology

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1. Experiment steps

1. Configure IP addresses for each vro

2. Start OSPF and enable OSPF for each interface

3. Create a loopback port and configure the IP address

4. Check whether Region 0 can learn the route of Region 3.

5. Configure the virtual link and check whether Zone 0 can learn the route from zone 3.

 

Iv. experiment content

Rt1

<H3C> system-View

[H3C] sysname zjrt1

[Zjrt1] interface loopback 0

[ZJRT1-LoopBack0] IP address 1.1.1.1 32

[ZJRT1-LoopBack0] Undo Shutdown

[ZJRT1-LoopBack0] Quit

[Zjrt1] interface serial 1/0

[ZJRT1-Serial1/0] IP address 192.168.1.1 24

[ZJRT1-Serial1/0] Undo Shutdown

[ZJRT1-Serial1/0] Quit

[Zjrt1] OSPF 1

[ZJRT1-ospf-1] area 1

[ZJRT1-ospf-1-area-0.0.0.1] network 1.1.1.1 0.0.0.0

[ZJRT1-ospf-1-area-0.0.0.1] network 192.168.1.0 0.0.255

 

 

Rt2

<H3C> system-View

[H3C] sysname zjrt2

[Zjrt2] interface serial 1/0

[ZJRT2-Serial1/0] IP address 192.168.1.2 24

[ZJRT2-Serial1/0] Undo Shutdown

[ZJRT2-Serial1/0] Quit

[Zjrt2] interface serial 2/0

[ZJRT2-Serial2/0] IP address 192.168.2.1 24

[ZJRT2-Serial2/0] Undo Shutdown

[ZJRT2-Serial2/0] Quit

[Zjrt2] OSPF 1

[ZJRT2-ospf-1] area 1

[ZJRT2-ospf-1-area-0.0.0.1] network 192.168.1.0 0.0.255

[ZJRT2-ospf-1-area-0.0.0.1] Quit

[ZJRT2-ospf-1] area 0

[ZJRT2-ospf-1-area-0.0.0.0] network 192.168.2.0 0.0.255

 

RT3

<H3C> system-View

[H3C] sysname zjrt3

[Zjrt3] interface serial 1/0

[ZJRT3-Serial1/0] IP address 192.168.2.2 24

[ZJRT3-Serial1/0] Undo Shutdown

[ZJRT3-Serial1/0] Quit

[Zjrt3] interface serial 2/0

[ZJRT3-Serial2/0] IP address 192.168.3.1 24

[ZJRT3-Serial2/0] Undo Shutdown

[ZJRT3-Serial2/0] Quit

[Zjrt3] OSPF 1

[ZJRT3-ospf-1] area 0

[ZJRT3-ospf-1-area-0.0.0.0] network 192.168.2.0 0.0.255

[ZJRT3-ospf-1-area-0.0.0.0] Quit

[ZJRT3-ospf-1] area 2

[ZJRT3-ospf-1-area-0.0.0.2] network 192.168.3.0 0.0.255

 

Rt4

<H3C> system-View

[H3C] sysname zjrt4

[Zjrt4] interface serial 1/0

[ZJRT4-Serial1/0] IP address 192.168.3.2 24

[ZJRT4-Serial1/0] Undo Shutdown

[ZJRT4-Serial1/0] Quit

[Zjrt4] interface loopback 0

[ZJRT4-LoopBack0] IP address 4.4.4.4 32

[ZJRT4-LoopBack0] Undo Shutdown

[ZJRT4-LoopBack0] Quit

[Zjrt4] OSPF 1

[ZJRT4-ospf-1] area 2

[ZJRT4-ospf-1-area-0.0.0.2] network 192.168.3.0 0.0.255

[ZJRT4-ospf-1-area-0.0.0.2] Quit

[ZJRT4-ospf-1] Area 3

[ZJRT4-ospf-1-area-0.0.0.3] network 4.4.4.4 0.0.0.0

 

Now, check the rt1 route table to see if you can learn the route in Area 3.

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You cannot learn the route in Area 3 because Area 3 is not connected to the backbone area.

Now let's create a virtual link, because Area 3 is connected to area 2, Area 2 is connected to the backbone area, and we configure virtual links on Area 2.

RT3

<Zjrt3> system-View

[Zjrt3] OSPF 1

[ZJRT3-ospf-1] area 2

[ZJRT3-ospf-1-area-0.0.0.2] vlink-peer 4.4.4.4

 

Rt4

<Zjrt4> system-View

[Zjrt4] OSPF 1

[ZJRT4-ospf-1] area 2

[ZJRT4-ospf-1-area-0.0.0.2] vlink-peer 192.168.3.1

 

 

Now, check the route table of rt1 to see if there are any routes in Area 3.

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Now, rt1 can learn the route of Area 3, because in multi-region OSPF, each non-backbone area must be connected to the backbone area. In this case, you must use a virtual link to build a tunnel between a non-backbone area and a backbone area.

Multi-region OSPF