OSPF basic experimental configuration

Experimental content ：

oSPF It is the mainstream routing protocol for large networks in the market ,oSPF And RIP The difference is this oSPF The subnet division of is generally divided by region , In this way, when sharing routes between regions, they are aggregated into one for transmission . 

  Experimental process ：

One 、 Subnet partition

R1-R3 Is the region 0,R3 To R4 Is the region 1, So you can 192.168.1.0/24 Divided into two network segments 192.168.1.0/25 For area 0  192.168.1.128/25 For area 1 ; then 192.168.1.0/25 Divided into four network segments 192.168.1.0/27（ be used for MA Network segment ） 192.168.1.0/29  192.168.1.8/29  192.168.1.16/29  192.168.1.24/29

192.168.1.32/27（R1 Loopback ）  192.168.1.64/27（R2 Loopback ）  192.168.1.96/27（R3 Loopback ）

 

Two 、 To configure oSFP

1、 Configuration of loopback and interface of each router (R1 For example )

interface GigabitEthernet0/0/0
ip address 192.168.1.1 29
interface LoopBack0
ip address 192.168.1.33 27

 R2\R3\R4 Same as R1

2、 Declare （R1 For example ）

ospf 1 route-id 1.1.1.1        start-up ospf And give a name 
area 0                         Enter the zone 0
network 192.168.1.0 0.0.0.255  Declare 192.168.1.0-255 

R2\R4 Same as R1,R4 Do not declare loopback

R3 Declare

ospf 1 router-id 3.3.3.3
area 0
network 192.168.1.3 0.0.0.0    The inverse mask is 0.0.0.0 For exact matching , Just announce 192.168.1.3  This address 
abr-summary 192.168.1.0 255.255.255.128   Route summary , Put the area 0 The routes are summarized into one route and transmitted to the area 1
area 1
network 192.168.1.129 0.0.0.0

3、 change R1\R2 The priority of the （R1 For example ）

interface GigabitEthernet0/0/0
ospf dr-priority 0    Change priority , The priority for 0, No participation DR、BDR The election 

R2 Same as R1 

4、 authentication （R1 For example ）

interface GigabitEthernet0/0/0
ospf authentication-mode md5 1 ciper 123456    Do authentication on the interface connecting neighbors , Security 

 R2\R3\R4 Same as R1

5、 Yes R4 Write default route

ospf 1
default-route-advertise always   Let the internal route generate a default route to the router 

  3、 ... and 、 test

 

 

  experimental result ：

The whole network can reach , To ensure the security of updates , Reduce the number of routing entries , Achieve the purpose of the experiment .