Configuration of OSPF protocol (take Huawei ENSP as an example)

If there is a mistake , Please kindly understanding ！

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Basic knowledge of ：

lsa  Link status notification （11 class lsa）   lsdb Link state database

ospf Of 5 A packet ：

    1.hello Find out maintain establish Neighborhood

    2.dbd Database summary

    3.lsr Link status request

    4.lsu Link status update

    5.lsack Link state acknowledgement packet  

ospf Configuration of ：

[r2]ospf 100 router-id 2.2.2.2

[r2-ospf-100]area 0

[r2-ospf-100-area-0.0.0.0]network 2.2.2.2 0.0.0.0

[r2-ospf-100-area-0.0.0.0]network 12.1.1.0 0.0.0.255      Note that it is unmasked 

The first ⼆ Kind of declaration ⽅ type ：

[r1]interface g0/0/0
[r1-GigabitEthernet0/0/0]ospf enable 100 area 0

ospf Rules of area division ：

    1. It has to be full ⾜ Star structure

    2. There must be abr（ Area border router ）

ospf Of dr/bdr The election rules of ：

    1.⽐ Higher priority （ The more ⼤ Better ）

    2.⽐ a router-id （ The more ⼤ Better ）

    3.⾮ Preemptive

Experimental Topology ：

  One 、 First of all to PC1-PC4 Delegate designation IP

    With PC1、PC2 For example ：

[r1] interface LoopBack 0
[r1-LoopBack0] ip address 0.0.0.0 32

[r1]interface g0/0/0
[r1-GigabitEthernet0/0/0]ip address 192.168.1.1 24
	
[r1]dhcp enable 
Info: The operation may take a few seconds. Please wait for a moment.done.

[r1]ip pool 1
Info: It's successful to create an IP address pool.
[r1-ip-pool-1]network 192.168.1.0 mask 255.255.255.0
[r1-ip-pool-1]dns-list 8.8.8.8	

[r1-ip-pool-1]static-bind ip-address 192.168.1.11 mac-address 5489-98AD-75D9
[r1-ip-pool-1]static-bind ip-address 192.168.1.22 mac-address 5489-9808-2C85

[r1]interface g0/0/0	
[r1-GigabitEthernet0/0/0]dhcp select global 

    Similarly, the above operation is PC3、PC4 To configure IP.

Two 、 Configure each node of the router IP

      With routers 6 For example ：

[r6]interface g0/0/0
[r6-GigabitEthernet0/0/0]ip address 123.1.1.4 24. 
[r6-GigabitEthernet0/0/0]quit
[r6]interface g0/0/1
[r6-GigabitEthernet0/0/1]ip address 46.1.1.2 24

    The remaining routers are configured according to this operation .

3、 ... and 、OSPF Configuration of

Configuration steps ：

     1、 Create and run OSPF process

     2、 Create and enter OSPF Area

     3、 Run the specified OSPF Interface

    With r3 For example ： 

[R3] ospf 1 router-id 2.2.2.2	
[R3-ospf-1] area 1	
[R3-ospf-1-area-0.0.0.0] network 23.1.1.2 0.0.0.255
[R3-ospf-1-area-0.0.0.0] area 0
[R3-ospf-1-area-0.0.0.1] network 123.1.1.1 0.0.0.255

Four 、 Realization r3/r4/r5 Between r3 Yes br nothing bdr

    Set the priority to 0：

[r4]interface g0/0/0
[r4-GigabitEthernet0/0/0]ospf dr-priority 0

5、 ... and 、 Speed up convergence

    With routers r1 For example ：

[r1]interface g0/0/0
[r1-GigabitEthernet0/0/0]ospf timer hello 5

6、 ... and 、 Regional certification

    area 1 Area plaintext Authentication :

[r2]ospf 100
[r2-ospf-100]area 1	
[r2-ospf-100-area-0.0.0.1]authentication-mode simple cipher123

    area 2 Regional ciphertext authentication :

[r5]ospf 100
[r5-ospf-100]area 2
[r5-ospf-100-area-0.0.0.2]authentication-mode simple cipher 123
[r5-ospf-100-area-0.0.0.2]authentication-mode md5

7、 ... and 、 Enforce decentralized routing

[r4]ospf 100
[r4-ospf-100]default-route-advertise always

8、 ... and 、 View routing configuration

Nine 、 test  

PC>ping 6.6.6.6

Ping 6.6.6.6: 32 data bytes, Press Ctrl_C to break
From 6.6.6.6: bytes=32 seq=1 ttl=128 time=31 ms
From 6.6.6.6: bytes=32 seq=2 ttl=128 time=32 ms
From 6.6.6.6: bytes=32 seq=3 ttl=128 time=47 ms
From 6.6.6.6: bytes=32 seq=4 ttl=128 time=31 ms
From 6.6.6.6: bytes=32 seq=5 ttl=128 time=31 ms

--- 6.6.6.6 ping statistics ---
  5 packet(s) transmitted
  5 packet(s) received
  0.00% packet loss
  round-trip min/avg/max = 31/34/47 ms

    The above process is what we want , Welcome friends to correct ！ Thank you very much !