基本配置
Step 1 Configure IP addresses for interconncetion interfaces and loopback interfaces.
[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]ip address 10.0.123.1 24
[R1-GigabitEthernet0/0/0]int l0
[R1-LoopBack0]ip address 10.0.1.1 24
[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]ip add 10.0.123.2 24
[R2-GigabitEthernet0/0/0]int g0/0/1
[R2-GigabitEthernet0/0/1]ip add 10.0.24.2 24
[R2-GigabitEthernet0/0/1]int l0
[R2-LoopBack0]ip add 10.0.2.2 24
[R2-LoopBack0]int l1
[R2-LoopBack1]ip add 10.2.0.1 24
[R2-LoopBack1]int l2
[R2-LoopBack2]ip add 10.2.1.1 24
[R3]int g0/0/0
[R3-GigabitEthernet0/0/0]ip add 10.0.123.3 24
[R3-GigabitEthernet0/0/0]int l0
[R3-LoopBack0]ip add 10.0.3.3 24
[R3-LoopBack0]int l1
[R3-LoopBack1]ip add 10.3.0.1 24
[R3-LoopBack1]int l2
[R3-LoopBack2]ip add 10.3.1.1 24
[R4]int g0/0/0
[R4-GigabitEthernet0/0/0]ip add 10.0.24.4 24
[R4-GigabitEthernet0/0/0]int g0/0/1
[R4-GigabitEthernet0/0/1]ip add 10.0.45.4 24
[R4-GigabitEthernet0/0/1]int l0
[R4-LoopBack0]ip add 10.0.4.4 24
[R5]int g0/0/0
[R5-GigabitEthernet0/0/0]ip add 10.0.45.5 24
[R5-GigabitEthernet0/0/0]int l0
[R5-LoopBack0]ip add 10.0.5.5 24
[R5-LoopBack0]int l1
[R5-LoopBack1]ip add 10.5.0.1 24
[R5-LoopBack1]int l2
[R5-LoopBack2]ip add 10.5.1.1 24
Step 2 Configure multi-area OSPF
[R1]ospf 1 router-id 10.0.1.1
[R1-ospf-1]area 2
[R1-ospf-1-area-0.0.0.2]network 10.0.123.1 0.0.0.0
[R1-ospf-1-area-0.0.0.2]network 10.0.1.1 0.0.0.0
[R2]ospf 1 router-id 10.0.2.2
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 10.0.24.2 0.0.0.0
[R2-ospf-1-area-0.0.0.0]network 10.0.2.2 0.0.0.0
[R2-ospf-1-area-0.0.0.0]area 2
[R2-ospf-1-area-0.0.0.2]network 10.0.123.2 0.0.0.0
[R3-ospf-1]area 2
[R3-ospf-1-area-0.0.0.2]network 10.0.123.3 0.0.0.0
[R3-ospf-1-area-0.0.0.2]network 10.0.3.3 0.0.0.0
[R3-ospf-1-area-0.0.0.2]network 10.3.0.1 0.0.0.0
[R3-ospf-1-area-0.0.0.2]network 10.3.1.1 0.0.0.0
[R4]ospf 1 router-id 10.0.4.4
[R4-ospf-1]area 0
[R4-ospf-1-area-0.0.0.0]network 10.0.24.4 0.0.0.0
[R4-ospf-1-area-0.0.0.0]network 10.0.4.4 0.0.0.0
[R4-ospf-1-area-0.0.0.0]quit
[R4-ospf-1]area 1
[R4-ospf-1-area-0.0.0.1]network 10.0.45.4 0.0.0.0
[R5]ospf 1 router-id 10.0.5.5
[R5-ospf-1]area 1
[R5-ospf-1-area-0.0.0.1]network 10.0.5.5 0.0.0.0
[R5-ospf-1-area-0.0.0.1]network 10.5.0.1 0.0.0.0
[R5-ospf-1-area-0.0.0.1]network 10.5.1.1 0.0.0.0
[R5-ospf-1-area-0.0.0.1]network 10.0.45.5 0.0.0.0
Step 3 Verify the OSPF configuration.
<R3>reset ospf process
<R2>display ospf peer
<R5>display ospf routing
<R2>display ospf lsdb
Step 4 Configure route summarization for OSPF inter-area routes and AS external routes
[R2]display ospf routing
<R4>display ospf routing
[R4-ospf-1-area-0.0.0.1]abr-summary 10.5.0.0 255.255.254.0
[R2-ospf-1-area-0.0.0.2]abr-summary 10.3.0.0 255.255.254.0
[R2-ospf-1]import-route direct
[R2-ospf-1]asbr-summary 10.2.0.0 255.255.254.0
Step 5 Change the bandwidth reference value of OSPF.
[R1-ospf-1]bandwidth-reference 10000
[R2-ospf-1]bandwidth-reference 10000
[R3-ospf-1]bandwidth-reference 10000
[R4-ospf-1]bandwidth-reference 10000
[R5-ospf-1]bandwidth-reference 10000
[R4]display ospf routing
Step 6 Configure OSPF to import a defualt route.
[R1]ip route-static 0.0.0.0 0.0.0.0 10.0.1.1
[R1-ospf-1]default-route-advertise
[R1-ospf-1]default-route-advertise always
[R1-ospf-1]default-route-advertise always type 1
Step 7 Change the preferences of the two types of OSPF routes.
<R3>display ip routing-table protocol ospf
[R1-ospf-1]preference 20
[R1-ospf-1]preference ase 50
[R3-ospf-1]preference 20
[R3-ospf-1]preference ase 50