1、 Set up the topology and start

2、 The experimental requirements
（1）、R4 by ISP, Can only be configured on it IP Address ;R4 Public equipment is used with all other directly connected equipment IP.

（2）、R3、R5、R6、R7 by MGRE Environmental Science ,R3 For the central site .

（3）、 Whole OSPF Environmental Science IP The address is based on 172.16.0.0/16 Divide .

（4）、 Reduce LSA Update quantity of , Speed up convergence , Keep updates safe .

（5）、 Network wide accessibility .

One 、 Address planning
According to the requirements ,IP According to the address 172.16.0.0/16 Address division ： share 5 individual ospf Area and a RIP Area , So we need to divide 6 Net segment ; Each network segment is divided into network segments according to the required requirements .

172.16.0.0/16   Excuse me

172.16.0.0/19 
172.16.32.0/19 
172.16.64.0/19 
172.16.96.0/19 
172.16.128.0/19 
172.16.160.0/19 
172.16.192.0/19
172.16.224.0/19

then , We borrow from each network segment 5 position , Divided into P2P The backbone 、MA Backbone and 3 User addresses ; Then divide the backbone network segment into the required users and loopback addresses ;

172.16.0.0/19 -----area 0   borrow 5 position

     172.16.0.0/24 --- P2P The backbone

          172.16.0.0/30

          172.16.0.4/30

          172.16.0.8/30

     172.16.1.0/24 --- MA The backbone

          172.16.1.0/29

          172,16.1.8/29

          172.16.1.16/29

     172.16.2.0/24 --- user

     172.16.3.0/24 --- user

     172.16.4.0/24 --- user

172.16.32.0/19 --- area 1

172.16.32.0  24 -----p2p The backbone

     172.16.32.0  30

     172.16.32.4  30

     172.16.32.8  30

172.16.33.0  24 -----MA The backbone

     172.16.33.0  29

     172.16.33.8  29

     172.16.33.16  29

172.16.34.0  24 --- R1 The loopback of

172.16.35.0  24 --- R2 The loopback of

172.16.36.0  24 --- R3 The loopback of

172.16.64.0/19 --- area 2

172.16.64.0  24 --- P2P The backbone

     172.16.64.0    30

     172.16.64.4    30

     172.16.64.8    30

172.16.65.0  24 --- MA The backbone

     172.16.65.0       29

     172.16.65.8       29

     172.16.65.16     29

172.16.66.0  24 --- R11 Loopback

172.16.67.0     24

172.16.68.0     24

172.16.96.0/19 --- area 3

172.16.96.0  24 --- P2P The backbone

    172.16.96.0     30

    172.16.96.4     30

    172.16.96.8     30

172.16.97.0  24 --- MA The backbone

    172.16.97.0       29

    172.16.97.8       29

    172.16.97.16     29

172.16.98.0         24

172.16.99.0         24

172.16.100.0       24

172.16.128.0      19 --- area 4

172.16.128.0       24 --- P2P The backbone

    172.16.128.0       30

    172.16.128.4       30

    172.16.128.8       30

172.16.129.0  24 --- MA The backbone

    172.16.129.0      29

    172.16.129.8      29

    172.16.129.16    29

172.16.130.0     24 --- R9 The loopback of

172.16.131.0     24 --- R10 The loopback of

172.16.132.0     24

172.16.160.0     19 --- RIP

172.16.160.0      20 --- Loopback

172.16.176.0      20 --- Loopback

Two 、 Yes area0 Equipment in the area IP Configuration of address, loopback address and default route
AR3

[r3]int s 4/0/0
[r3-Serial4/0/0]ip a 34.0.0.1 24
[r3]ip route-static 0.0.0.0 0 34.0.0.2

AR4

[isp]int s 4/0/0
[isp-Serial4/0/0]ip a 34.0.0.2 24
[isp-Serial4/0/0]int s 3/0/0
[isp-Serial3/0/0]ip a 46.0.0.2 24
[isp-Serial3/0/0]int s 4/0/1
[isp-Serial4/0/1]ip a 45.0.0.2 24
[isp-Serial4/0/1]int g0/0/0
[isp-GigabitEthernet0/0/0]ip a 47.0.0.2 24
[isp-GigabitEthernet0/0/0]int lo0
[isp-LoopBack0]ip a 4.4.4.4 24

AR5

[r5]int s 4/0/0
[r5-Serial4/0/0]ip a 45.0.0.1 24
[r5-Serial4/0/0]int lo0
[r5-LoopBack0]ip a 172.16.2.1 24
[r5]ip route-static 0.0.0.0 0 45.0.0.2

AR6

[r6]int s 4/0/0
[r6-Serial4/0/0]ip a 46.0.0.1 24
[r6-Serial4/0/0]int lo0
[r6-LoopBack0]ip a 172.16.3.1 24
[r6]ip route-static 0.0.0.0 0 46.0.0.2

AR7

[r7]int g0/0/0
[r7-GigabitEthernet0/0/0]ip a 47.0.0.1 24
[r7-GigabitEthernet0/0/0]int lo0
[r7-LoopBack0]ip a 172.16.4.1 24
[r7]ip route-static 0.0.0.0 0 47.0.0.2

To configure area1

To configure area2 

To configure area3 

 R8 

To configure area4 

To configure RIP 

  3、 ... and 、 Start each device OSPF agreement
AR1

[r1]ospf 1 router-id 1.1.1.1
[r1-ospf-1]a 1
[r1-ospf-1-area-0.0.0.1]network 172.16.0.0 0.0.255.255

AR2

[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]a 1
[r2-ospf-1-area-0.0.0.1]network 172.16.0.0 0.0.255.255

AR3

[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]a 1
[r3-ospf-1-area-0.0.0.1]network 172.16.32.0 0.0.7.255

[r3-ospf-1-area-0.0.0.1]a 0
[r3-ospf-1-area-0.0.0.0]net    
[r3-ospf-1-area-0.0.0.0]network 172.16.1.1 0.0.0.0

AR5

[r5]ospf 1 rout    
[r5]ospf 1 router-id 5.5.5.5
[r5-ospf-1]a 0  
[r5-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

AR6

[r6]ospf 1 router-id 6.6.6.6
[r6-ospf-1]a 0
[r6-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.3.255
[r6-ospf-1-area-0.0.0.0]a 2
[r6-ospf-1-area-0.0.0.2]network 172.16.65.1 0.0.0.0

AR7

[r7]ospf 1 router-id 7.7.7.7
[r7-ospf-1]a 0   
[r7-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.7.255
[r7-ospf-1-area-0.0.0.0]a 3
[r7-ospf-1-area-0.0.0.3]network 172.16.97.1 0.0.0.0

AR8

[r8]ospf 1 router-id 8.8.8.8
[r8-ospf-1]a 3
[r8-ospf-1-area-0.0.0.3]network 172.16.0.0 0.0.255.255

AR9

[r9]ospf 1 router-id 9.9.9.9
[r9-ospf-1]a 3
[r9-ospf-1-area-0.0.0.3]network 172.16.97.10 0.0.0.0
[r9-ospf-1-area-0.0.0.3]a 4
[r9-ospf-1-area-0.0.0.4]network 172.16.128.0 0.0.3.255

AR10

[r10]ospf 1 router-id 10.10.10.10
[r10-ospf-1]a 4 
[r10-ospf-1-area-0.0.0.4]network 172.16.0.0 0.0.255.255

AR11

[r11]ospf 1 router-id 11.11.11.11
[r11-ospf-1]a 2
[r11-ospf-1-area-0.0.0.2]network 172.16.0.0 0.0.255.255

AR12

[r12]ospf 1 router-id 12.12.12.12
[r12-ospf-1]a 2 
[r12-ospf-1-area-0.0.0.2]network 172.16.65.10 0.0.0.0
[r12]rip 1
[r12-rip-1]v 2
[r12-rip-1]network 172.16.0.0

Four 、 change tunnel Interface type of interface
AR3

[r3]int t0/0/0
[r3-Tunnel0/0/0]ospf network-type p2mp

AR5

[r5]int t0/0/0 
[r5-Tunnel0/0/0]ospf network-type p2mp

AR6

[r6]int t0/0/0 
[r6-Tunnel0/0/0]ospf network-type p2mp

AR7

[r7]int t0/0/0
[r7-Tunnel0/0/0]ospf network-type p2mp

5、 ... and 、 stay R12 Republish

AR12

[r12]ospf 1 
[r12-ospf-1]import-route rip 1

6、 ... and 、 In order to reduce the LSA Update quantity of , We need to do summary and special areas
Be careful ： In order to avoid loops, we also need to configure empty interface routes .

Special area  

area0

[r1]ospf 1
[r1-ospf-1]area 1
[r1-ospf-1-area-0.0.0.1]stub 
 
[r2]ospf 1
[r2-ospf-1]area 1
[r2-ospf-1-area-0.0.0.1]stub 
 
[r3]ospf 1
[r3-ospf-1]area 1
[r3-ospf-1-area-0.0.0.1]stub no-summary

area2

[r6]ospf 1
[r6-ospf-1]area 2
[r6-ospf-1-area-0.0.0.2]nssa no-summary
 
[r11]ospf 1
[r11-ospf-1]area 2
[r11-ospf-1-area-0.0.0.2]nssa 
 
[r12]ospf 1
[r12-ospf-1]area 2
[r12-ospf-1-area-0.0.0.2]nssa

area3

[r7]ospf 1
[r7-ospf-1]area 3
[r7-ospf-1-area-0.0.0.3]nssa no-summary
 
[r8]ospf 1
[r8-ospf-1]area 3
[r8-ospf-1-area-0.0.0.3]nssa 
 
[r9]ospf 1
[r9-ospf-1]area 3
[r9-ospf-1-area-0.0.0.3]nssa

7、 ... and 、 To configure NET, Make it accessible R4 Loopback .

  8、 ... and 、 Speed up convergence , Need to change HELLO Time , To change the hello The time of death will also change automatically .

  Nine 、 Conduct manual certification , Regional certification （ In fact, it is also interface authentication ）, The purpose is to update security .