Experimental requirements
1. R4 is an ISP, and all the physical interfaces connected to it are public network segments. You can specify the IP arbitrarily.
2. R1-2-3 builds a star-shaped MGRE structure, in which R1 is the center point. Assume the public IP of R1.
Construct another fully meshed MGRE network for fixed addresses 3 and R1-4-5, in which R1/5 are the central areas;
4. Use OSPF to realize intercommunication of the entire private network, and at the same time, all PCs can normally access the ring of R6. return
Step One: IP Address Planning
PC address:
| equipment | gateway | URL |
| PC1 | 192.168.1.1 24 | 192.168.1.2 24 |
| PC2 | 192.168.2.1 24 | 192.168.2.1 24 |
| PC3 | 192.168.3.1 24 | 192.168.3.2 24 |
| PC4 | 192.168.4.1 24 | 192.168.4.2 24 |
| PC5 | 192.168.5.1 24 | 192.168.5.2 24 |
Device address:
| equipment | interface | address |
| R1 | g0/0/0 | 192.168.1.1 24 |
| g0/0/1 | 16.1.1.1 24 | |
| g0/0/2 | 61.1.1.1 24 | |
| R2 | g0/0/0 | 192.168.2.1 24 |
| g0/0/1 | 26.1.1.2 24 | |
| R3 | g0/0/0 | 192.168.2.1 24 |
| g0/0/1 | 36.1.1.3 24 |
|
| R4 | g0/0/0 | 162.168.4.1 24 |
| g0/0/1 | 46.1.1.4 24 | |
| R5 | g0/0/0 | 192.168.5.1 24 |
| g0/0/1 | 56.1.1.5 24 | |
| R6 | g0/0/0 | 16.1.1.6 24 |
| g2/0/0 | 61.1.1.6 24 | |
| g0/0/1 | 26.1.1.6 24 | |
| g0/0/2 | 36.1.1.6 24 | |
| g3/0/0 | 56.1.1.6 24 | |
| g4/0/0 | 46.1.1.6 24 |
Step 2: Configure and assign IP address
R1 configuration
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 192.168.1.1/24 up up
GigabitEthernet0/0/1 16.1.1.1/24 up up
GigabitEthernet0/0/2 61.1.1.6/24 up up
NULL0 unassigned up up(s)
R2 configuration
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 192.168.2.1/24 up up
GigabitEthernet0/0/1 26.1.1.2/24 up up
GigabitEthernet0/0/2 unassigned down down
NULL0 unassigned up up(s)
R3 configuration
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 192.168.3.1/24 up up
GigabitEthernet0/0/1 36.1.1.3/24 up up
GigabitEthernet0/0/2 unassigned down down
NULL0 unassigned up up(s)
R4 configuration
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 192.168.4.1/24 up up
GigabitEthernet0/0/1 46.1.1.4/24 up up
GigabitEthernet0/0/2 unassigned down down
NULL0 unassigned up up(s)
R5 configuration
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 192.168.5.1/24 up up
GigabitEthernet0/0/1 56.1.1.5/24 up up
GigabitEthernet0/0/2 unassigned down down
NULL0 unassigned up up(s)
R6 configuration
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 16.1.1.6/24 up up
GigabitEthernet0/0/1 26.1.1.6/24 up up
GigabitEthernet0/0/2 36.1.1.6/24 up up
GigabitEthernet2/0/0 61.1.1.6/24 up up
GigabitEthernet3/0/0 56.1.1.6/24 up up
GigabitEthernet4/0/0 46.1.1.6/24 up up
LoopBack0 6.6.6.6/24 up up(s)
NULL0 unassigned up up(s)
Step 3: Configure default route
[R1]ip route-static 0.0.0.0 0 16.1.1.6
[R2]ip route-static 0.0.0.0 0 26.1.1.6
[R3]ip route-static 0.0.0.0 0 36.1.1.6
[R4]ip route-static 0.0.0.0 0 46.1.1.6
[R5]ip route-static 0.0.0.0 0 56.1.1.6
Step 4: NAT
R1 configuration
[R1]acl 2000
[R1-acl-basic-2000]rule 1 permit source any
[R1]int g 0/0/1
[R1-GigabitEthernet0/0/1]nat outbound 2000R2 configuration
[R2]acl 2000
[R2-acl-basic-2000]rule 1 permit source any
[R2]int g 0/0/1
[R2-GigabitEthernet0/0/1]nat outbound 2000R3 configuration
[R3]acl 2000
[R3-acl-basic-2000]rule 1 permit source any
[R3]int g 0/0/1
[R3-GigabitEthernet0/0/1]nat outbound 2000R4 configuration
[R4]acl 2000
[R4-acl-basic-2000]rule 1 permit source any
[R4]int g 0/0/1
[R4-GigabitEthernet0/0/1]nat outbound 2000R5 configuration
[R5]acl 2000
[R5-acl-basic-2000]rule 1 permit source any
[R5]int g 0/0/1
[R5-GigabitEthernet0/0/1]nat outbound 2000test
PC>ping 6.6.6.6
Ping 6.6.6.6: 32 data bytes, Press Ctrl_C to break
Request timeout!
From 6.6.6.6: bytes=32 seq=2 ttl=254 time=46 ms
From 6.6.6.6: bytes=32 seq=3 ttl=254 time=16 ms
From 6.6.6.6: bytes=32 seq=4 ttl=254 time=16 ms
From 6.6.6.6: bytes=32 seq=5 ttl=254 time=15 ms--- 6.6.6.6 ping statistics ---
5 packet(s) transmitted
4 packet(s) received
20.00% packet loss
round-trip min/avg/max = 0/23/46 ms
PC1 can communicate with the public network
Step 5: R1-2-3 builds a star-structured MGRE structure
R1 configuration
[R1]interface Tunnel 0/0/0
[R1-Tunnel0/0/0]ip address 10.1.1.1 24
[R1-Tunnel0/0/0]tunnel-protocol gre p2mp
[R1-Tunnel0/0/0]source 61.1.1.1
[R1-Tunnel0/0/0]nhrp network-id 100
R2 configuration
[R2]interface Tunnel 0/0/0
[R2-Tunnel0/0/0]ip address 10.1.1.2 24
[R2-Tunnel0/0/0]tunnel-protocol gre p2mp
[R2-Tunnel0/0/0]source g0/0/1
[R2-Tunnel0/0/0]nhrp entry 10.1.1.1 61.1.1.1 register
[R2-Tunnel0/0/0]nhrp network-id 100R3 configuration
[R3]interface Tunnel 0/0/0
[R3-Tunnel0/0/0]ip address 10.1.1.3 24
[R3-Tunnel0/0/0]tunnel-protocol gre p2mp
[R3-Tunnel0/0/0]source g0/0/1
[R3-Tunnel0/0/0]nhrp entry 10.1.1.1 61.1.1.1 register
[R3-Tunnel0/0/0]nhrp network-id 100Step 6: R1-4-5 Build another fully meshed MGRE network
R1 configuration
[R1]interface Tunnel 0/0/1
[R1-Tunnel0/0/1]ip address 20.1.1.1 24
[R1-Tunnel0/0/1]tunnel-protocol gre p2mp
[R1-Tunnel0/0/1]source 16.1.1.1
[R1-Tunnel0/0/1]nhrp network-id 101
[R1-Tunnel0/0/1]nhrp entry 20.1.1.2 46.1.1.4 register
[R1-Tunnel0/0/1]nhrp entry 20.1.1.3 56.1.1.5 register R4 configuration
[R4]interface Tunnel 0/0/1
[R4-Tunnel0/0/1]ip address 20.1.1.2 24
[R4-Tunnel0/0/1]tunnel-protocol gre p2mp
[R4-Tunnel0/0/1]source 46.1.1.4
[R4-Tunnel0/0/1]nhrp network-id 101
[R4-Tunnel0/0/1]nhrp entry 20.1.1.1 16.1.1.1 register
[R4-Tunnel0/0/1]nhrp entry 20.1.1.3 56.1.1.5 register R5 configuration
[R5]interface Tunnel 0/0/1
[R5-Tunnel0/0/1]ip address 20.1.1.3 24
[R5-Tunnel0/0/1]tunnel-protocol gre p2mp
[R5-Tunnel0/0/1]source 56.1.1.5
[R5-Tunnel0/0/1]nhrp network-id 101
[R5-Tunnel0/0/1]nhrp entry 20.1.1.1 16.1.1.1 register
[R5-Tunnel0/0/1]nhrp entry 20.1.1.2 46.1.1.4 register Step 7: Write OSPF
R1 configuration
[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]ar
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]net
[R1-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[R1-ospf-1-area-0.0.0.0]net
[R1-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
[R1-ospf-1-area-0.0.0.0]ne
[R1-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255R2 configuration
[R2]ospf 1 router-id 2.2.2.2
[R2-ospf-1]ar
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]ne
[R2-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]net
[R2-ospf-1-area-0.0.0.0]network 192.168.2.0 0.0.0.255R3 configuration
[R3]ospf 1 router-id 3.3.3.3
[R3-ospf-1]ar
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]ne
[R3-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
[R3-ospf-1-area-0.0.0.0]net
[R3-ospf-1-area-0.0.0.0]network 192.168.3.0 0.0.0.255R4 configuration
[R4]ospf 1 router-id 4.4.4.4
[R4-ospf-1]ar
[R4-ospf-1]area 0
[R4-ospf-1-area-0.0.0.0]net
[R4-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[R4-ospf-1-area-0.0.0.0]net
[R4-ospf-1-area-0.0.0.0]network 192.168.4.0 0.0.0.255R5 configuration
[R5]ospf 1 router-id 5.5.5.5
[R5-ospf-1]ar
[R5-ospf-1]area 0
[R5-ospf-1-area-0.0.0.0]net
[R5-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[R5-ospf-1-area-0.0.0.0]net
[R5-ospf-1-area-0.0.0.0]network 192.168.5.0 0.0.0.255Step 7: Modify p2p to bordcast
R1 configuration
[R1]interface Tunnel 0/0/0
[R1-Tunnel0/0/0]ospf network-type broadcast
[R1]interface Tunnel 0/0/1
[R1-Tunnel0/0/1]ospf network-type broadcast R2 configuration
[R2]interface Tunnel 0/0/0
[R2-Tunnel0/0/0]ospf network-type broadcast R3 configuration
[R3]interface Tunnel 0/0/0
[R3-Tunnel0/0/0]ospf network-type broadcast R4 configuration
[R4]interface Tunnel 0/0/1
[R4-Tunnel0/0/1]ospf network-type broadcast R5 configuration
[R5]interface Tunnel 0/0/1
[R5-Tunnel0/0/1]ospf network-type broadcast Step 8: Turn on pseudo broadcast
R1 configuration
[R1]interface Tunnel 0/0/0
[R1-Tunnel0/0/0]nhrp entry multicast dynamic
[R1-Tunnel0/0/0]q
[R1]interface Tunnel 0/0/1
[R1-Tunnel0/0/1]nhrp entry multicast dynamic R4 configuration
[R4]interface Tunnel 0/0/1
[R4-Tunnel0/0/1]nhrp entry multicast dynamic R5 configuration
[R5]interface Tunnel 0/0/1
[R5-Tunnel0/0/1]nhrp entry multicast dynamic Step 10: Modify priority
R2 configuration
[R2]interface Tunnel 0/0/0
[R2-Tunnel0/0/0]os
[R2-Tunnel0/0/0]ospf d
[R2-Tunnel0/0/0]ospf dr-priority 0R3 configuration
[R3]interface Tunnel 0/0/0
[R3-Tunnel0/0/0]o
[R3-Tunnel0/0/0]ospf d
[R3-Tunnel0/0/0]ospf dr-priority 0