OSPF experiment

① Configure hostname and address （ List only R1）

<Huawei>sys
Enter system view, return user view with Ctrl+Z.
[Huawei]sys R1
[R1]int gi0/0/0
[R1-GigabitEthernet0/0/0]ip add 192.168.0.1 24

②③④ Turn on OSPF Process and configuration Rid（ With R1 For example ,R2 Interface priority is lower than R1）

[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]qu
[R1]int GigabitEthernet 0/0/0
[R1-GigabitEthernet0/0/0]ospf dr-priority 200

verification R1 Whether to become DR, as follows , Has become a DR

[R1-ospf-1]dis ospf interface GigabitEthernet 0/0/0

	 OSPF Process 1 with Router ID 1.1.1.1
		 Interfaces 


 Interface: 192.168.0.1 (GigabitEthernet0/0/0)
 Cost: 1       State: DR        Type: Broadcast    MTU: 1500  
 Priority: 200
 Designated Router: 192.168.0.1
 Backup Designated Router: 192.168.0.2
 Timers: Hello 10 , Dead 40 , Poll  120 , Retransmit 5 , Transmit Delay 1 

⑤R3 And R4 Enable between MD5 type （ List only R3）

[R3]int Serial 4/0/0
[R3-Serial4/0/0]ospf authentication-mode md5 1 cipher ayanami

⑥ verification R1 to 4.4.4.4 The cost of , as follows , by 49

[R1]dis ip routing-table 
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
         Destinations : 9        Routes : 9        

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        4.4.4.4/32  OSPF    10   49          D   192.168.0.3     GigabitEthernet
0/0/0
       34.0.0.0/8   OSPF    10   49          D   192.168.0.3     GigabitEthernet
0/0/0
  ---- More ----

stay R1 The output port of Gi0/0/0 Check the cost on , stay R3 Of S4/0/0 View the cost , Add to 49（ List only R4）

[R3]dis ospf int Serial 4/0/0

	 OSPF Process 1 with Router ID 3.3.3.3
		 Interfaces 


 Interface: 34.0.0.3 (Serial4/0/0) --> 34.0.0.4
 Cost: 48      State: P-2-P     Type: P2P       MTU: 1500  
 Timers: Hello 10 , Dead 40 , Poll  120 , Retransmit 5 , Transmit Delay 1 

R1 Of Gi 0/0/0 The cost is 1,R3 Of S 4/0/0 The cost is 48, Add to 49

⑦⑧R8 Simulate operator network

R8 For operator networks , explain R4 There is only one to R8 Static or default routing

[R4]ip route-static 0.0.0.0 0 48.0.0.8

Be careful ,R8（ Operator, ） There should be a default route for the return trip （ Actually, it is impossible in the production environment ）

[R8]ip route-static 0.0.0.0 0.0.0.0 48.0.0.4

here ASBR（R4） Release OSPF The default route can realize all Netcom

[R4]ospf 1
[R4-ospf-1]default-route-advertise

notes ： if R8 No default route ,R4 Release OSPF The default route can not realize all Netcom （ Lack of backhaul routing ）, At this point, you can achieve full Netcom by injecting direct routes （ The experiment shows that ）

Routing comprehensive experiment （7/21,21min）

Omit interface address configuration and RIP、OSPF Announcement configuration （OSPF Router id by x.x.x.x, namely R4 by 4.4.4.4, List in sequence ）

R1、R2、R4 Only one static route can be configured ：

[R1]ip route-static 0.0.0.0 0 192.168.255.1

[R2]ip route-static 0.0.0.0 0 10.1.1.1

[R4]ip route-s 0.0.0.0 0.0.0.0 151.151.1.2

R3 Only static addresses can be configured （ There is no limit to the number of hops ）

[R3]ip route-s 10.1.1.0 30 192.168.255.2
[R3]ip route-s 2.2.2.2 32 192.168.255.2
[R3]ip route-s 131.131.255.0 28 151.151.1.1
[R3]ip route-s 7.7.7.7 32 151.151.1.1
// Be careful ,ip route-s 131.131.255.0 28 It's actually 131.131.255.0 /30、131.131.255.4 /30、131.131.255.8 /30, Here's a summary 

R4 Need to publish OSPF Default route

[R4]ospf 1
[R4-ospf-1]default-route-advertise 

So far, all Netcom , Verified as follows ：

[R2]ping -a 2.2.2.2 7.7.7.7
  PING 7.7.7.7: 56  data bytes, press CTRL_C to break
    Reply from 7.7.7.7: bytes=56 Sequence=1 ttl=250 time=50 ms
    Reply from 7.7.7.7: bytes=56 Sequence=2 ttl=250 time=70 ms
    Reply from 7.7.7.7: bytes=56 Sequence=3 ttl=250 time=50 ms
    Reply from 7.7.7.7: bytes=56 Sequence=4 ttl=250 time=40 ms
    Reply from 7.7.7.7: bytes=56 Sequence=5 ttl=250 time=50 ms

  --- 7.7.7.7 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 40/52/70 ms

[R2]tracert 7.7.7.7

 traceroute to  7.7.7.7(7.7.7.7), max hops: 30 ,packet length: 40,press CTRL_C t
o break 

 1 10.1.1.1 20 ms  20 ms  10 ms 

 2 192.168.255.1 20 ms  20 ms  20 ms 

 3 151.151.1.1 30 ms  30 ms  30 ms 

 4 131.131.255.14 40 ms  40 ms  30 ms 

 5 131.131.255.9 40 ms  40 ms  40 ms 

 6 131.131.255.2 40 ms  50 ms  40 ms 

Add ：

Upon confirmation of OSPF Whether the neighbors are established , stay R6 It is more convenient to view commands on , Because the device has more neighbors ;

If R4 And R5 Between or R5 And R6 There is a problem with the line between ,2.2.2.2 Still ping through 7.7.7.7（ adopt 131.131.255.4 /30）, After the line is restored ,OSPF After the neighbors are re established ,2.2.2.2 Still pass R5 arrive 7.7.7.7（Cost Less valuable ,Serial Interface cost The value is 48）