Republishing and routing strategy of OSPF

The experimental requirements ：

 R1 Except for self loopback , Plus several loops
172.16.1.0/24 deny

172.16.2.0/24 type 1

172.16.3.0/24 cost 6

172.16.4.0/24 type 1 cost 9
Change the above parameters

 

ordinary IP Planning and configuration  

 

Follow the above figure IP To configure

Dynamic routing configuration

The title requires that the blue area be used RIP, The red area uses OSPF,R2 The loopback of is announced in RIP,R4 The loopback of is announced in OSPF

R1

[R1]rip 1
[R1-rip-1]version 2
[R1-rip-1]network 1.0.0.0
[R1-rip-1]network 172.16.0.0
[R1-rip-1]network 12.0.0.0 
[R1-rip-1]network 14.0.0.0 

R2

[R2]rip 1
[R2-rip-1]version 2
[R2-rip-1]network 12.0.0.0
[R2-rip-1]network 2.0.0.0
[R2-rip-1]q
[R2]ospf 1
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 23.1.1.1 0.0.0.0

R3

[R3]ospf 1
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]network 23.1.1.2 0.0.0.0

[R3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[R3-ospf-1-area-0.0.0.0]network 34.1.1.2 0.0.0.0

 R4

[R4]ospf 1
[R4-ospf-1]area 0
[R4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
[R4-ospf-1-area-0.0.0.0]network 34.1.1.1 0.0.0.0

[R4-ospf-1-area-0.0.0.0]q
[R4-ospf-1]q
[R4]rip 1
[R4-rip-1]version 2
[R4-rip-1]network 14.0.0.0

 

Reissue  

In the OSPF In the release RIP It is necessary to make routing strategies , We need two ASBR To configure

With R2 For example

Crawl prefix list

[R2]ip ip-prefix 1 permit 172.16.1.0 24
[R2]ip ip-prefix 2 permit 172.16.2.0 24
[R2]ip ip-prefix 3 permit 172.16.3.0 24
[R2]ip ip-prefix 4 permit 172.16.4.0 24 

  Routing strategy

[R2]route-policy huawei deny node 10
Info: New Sequence of this List.
[R2-route-policy]if-match ip-prefix 1
[R2-route-policy]quit

[R2]route-policy huawei permit node 20
Info: New Sequence of this List.
[R2-route-policy]if-match ip-prefix 2
[R2-route-policy]apply cost-type type-1
[R2-route-policy]quit

[R2]route-policy huawei permit node 30
Info: New Sequence of this List.
[R2-route-policy]if-match ip-prefix 3
[R2-route-policy]apply cost 6
[R2-route-policy]quit

[R2]route-policy huawei permit node 40
Info: New Sequence of this List.
[R2-route-policy]if-match ip-prefix 4
[R2-route-policy]apply cost-type type-1
[R2-route-policy]apply cost 9

Two way republishing and calling

[R2]ospf 1
[R2-ospf-1]import-route rip 1 route-policy huawei
[R2-ospf-1]q
[R2]rip 1
[R2-rip-1]import-route ospf 1

When it's done, it can be done in R4 Check the routing table on

  The same goes for completion R3 On the configuration

Routing optimization

see R1 The routing table for

It can be found that R4 The loopback of has two routes , One is through R4 Go directly to , The other is through R2 Go round and go back R4 Go again , Obviously, the route selection is poor .

Solution ：1、 Loopback interface configuration 32 Bitmask ip Address    2、 Modify the network type of the loopback interface

1、

[R4]interface LoopBack 0

[R4-LoopBack0]ip add 4.4.4.4 32

2、

[R4]interface LoopBack 0
[R4-LoopBack0]ospf network-type broadcast 

After taking any plan , Look at the routing table again

 

You can see that the route entry becomes a