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Configure OSPF route summary on the ABR

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R1 Configuration:

Interface Loopback1

Ip address 1.1.1.1 255.255.255.0

!

Interface Loopback2

Ip address 1.1.2.1 255.255.255.0

!

Interface Loopback3

Ip address 1.1.3.1 255.255.255.0

!

Interface Serial1/1

Ip address 10.0.1.1 255.255.255.0

Serial restart-delay 0

!

Router ospf 1

Log-adjacency-changes

Network 1.1.1.0 0.0.255 area 1

Network 1.1.2.0 0.0.255 area 1

Network 1.1.3.0 0.0.255 area 1

Network 10.0.1.0 0.0.0.255 area 1

!

 

R2 Configuration:

Interface Serial1/0

Ip address 10.0.1.2 255.255.255.0

Serial restart-delay 0

!

Interface Serial1/1

Ip address 10.0.2.1 255.255.255.0

Serial restart-delay 0

!

Router ospf 1

Log-adjacency-changes

Network 10.0.1.0 0.0.0.255 area 1

Network 10.0.2.0 0.0.0.255 area 0

!

 

 

R3 Configuration:

Interface Serial1/0

Ip address 10.0.2.2 255.255.255.0

Serial restart-delay 0

!

Interface Serial1/1

Ip address 10.0.3.1 255.255.255.0

Serial restart-delay 0

!

Router ospf 1

Log-adjacency-changes

Network 10.0.2.0 0.0.0.255 area 0

Network 10.0.3.0 0.0.0.255 area 2

!

 

R4 Configuration:

Interface Loopback1

Ip address 4.4.1.4 255.255.255.0

!

Interface Loopback2

Ip address 4.4.2.4 255.255.255.0

!

Interface Loopback3

Ip address 4.4.3.4 255.255.255.0

!

Interface Serial1/0

Ip address 10.0.3.2 255.255.255.0

Serial restart-delay 0

!

Router ospf 1

Log-adjacency-changes

Network 4.4.1.0 0.0.0.255 area 2

Network 4.4.2.0 0.0.0.255 area 2

Network 4.4.3.0 0.0.0.255 area 2

Network 10.0.3.0 0.0.0.255 area 2

!

 

At the end of the preceding command, configure the OSPF route tables for each vro as follows:

R1 # show ip route

Codes: C-connected, S-static, R-RIP, M-mobile, B-BGP

D-OSPF, EX-VPN external, O-OSPF, IA-OSPF inter area

N1-ospf nssa external type 1, N2-ospf nssa external type 2

E1-OSPF external type 1, E2-OSPF external type 2

I-IS, su-IS summary, L1-IS-level-1, L2-IS level-2

Ia-IS inter area, *-candidate default, U-per-user static route

O-ODR, P-periodic downloaded static route

 

Gateway of last resort is not set

 

1.0.0.0/24 is subnetted, 3 subnets

C 1.1.1.0 is directly connected, Loopback1

C 1.1.2.0 is directly connected, Loopback2

C 1.1.3.0 is directly connected, Loopback3

4.0.0.0/32 is subnetted, 3 subnets

O ia 4.4.1.4 [110/193] via 10.0.1.2, 00:07:19, Serial1/1

O ia 4.4.2.4 [110/193] via 10.0.1.2, 00:07:19, Serial1/1

O ia 4.4.3.4 [110/193] via 10.0.1.2, 00:07:19, Serial1/1

10.0.0.0/24 is subnetted, 3 subnets

O ia 10.0.2.0 [110/128] via 10.0.1.2, 00:44:09, Serial1/1

O ia 10.0.3.0 [110/192] via 10.0.1.2, 00:07:19, Serial1/1

C 10.0.1.0 is directly connected, Serial1/

 

R2 # show ip route

Codes: C-connected, S-static, R-RIP, M-mobile, B-BGP

D-OSPF, EX-VPN external, O-OSPF, IA-OSPF inter area

N1-ospf nssa external type 1, N2-ospf nssa external type 2

E1-OSPF external type 1, E2-OSPF external type 2

I-IS, su-IS summary, L1-IS-level-1, L2-IS level-2

Ia-IS inter area, *-candidate default, U-per-user static route

O-ODR, P-periodic downloaded static route

 

Gateway of last resort is not set

 

1.0.0.0/32 is subnetted, 3 subnets

O 1.1.1.1 [110/65] via 10.0.1.1, 00:44:42, Serial1/0

O 1.1.3.1 [110/65] via 10.0.1.1, 00:44:42, Serial1/0

O 1.1.2.1 [110/65] via 10.0.1.1, 00:44:42, Serial1/0

4.0.0.0/32 is subnetted, 3 subnets

O ia 4.4.1.4 [110/129] via 10.0.2.2, 00:07:52, Serial1/1

O ia 4.4.2.4 [110/129] via 10.0.2.2, 00:07:52, Serial1/1

O ia 4.4.3.4 [110/129] via 10.0.2.2, 00:07:52, Serial1/1

10.0.0.0/24 is subnetted, 3 subnets

C 10.0.2.0 is directly connected, Serial1/1

O ia 10.0.3.0 [110/128] via 10.0.2.2, 00:07:52, Serial1/1

C 10.0.1.0 is directly connected, Serial1/0

 

R3 # show ip route

Codes: C-connected, S-static, R-RIP, M-mobile, B-BGP

D-OSPF, EX-VPN external, O-OSPF, IA-OSPF inter area

N1-ospf nssa external type 1, N2-ospf nssa external type 2

E1-OSPF external type 1, E2-OSPF external type 2

I-IS, su-IS summary, L1-IS-level-1, L2-IS level-2

Ia-IS inter area, *-candidate default, U-per-user static route

O-ODR, P-periodic downloaded static route

 

Gateway of last resort is not set

 

1.0.0.0/32 is subnetted, 3 subnets

O ia 1.1.1.1 [110/129] via 10.0.2.1, 00:08:09, Serial1/0

O ia 1.1.3.1 [110/129] via 10.0.2.1, 00:08:09, Serial1/0

O ia 1.1.2.1 [110/129] via 10.0.2.1, 00:08:09, Serial1/0

4.0.0.0/32 is subnetted, 3 subnets

O 4.4.1.4 [110/65] via 10.0.3.2, 00:08:19, Serial1/1

O 4.4.2.4 [110/65] via 10.0.3.2, 00:08:19, Serial1/1

O 4.4.3.4 [110/65] via 10.0.3.2, 00:08:19, Serial1/1

10.0.0.0/24 is subnetted, 3 subnets

C 10.0.2.0 is directly connected, Serial1/0

C 10.0.3.0 is directly connected, Serial1/1

O ia 10.0.1.0 [110/128] via 10.0.2.1, 00:08:09, Serial1/0

 

R4 # show ip route

* Oct 10 17:49:31. 863: % SYS-5-CONFIG_ I: Configured from console by consoleroute

Codes: C-connected, S-static, R-RIP, M-mobile, B-BGP

D-OSPF, EX-VPN external, O-OSPF, IA-OSPF inter area

N1-ospf nssa external type 1, N2-ospf nssa external type 2

E1-OSPF external type 1, E2-OSPF external type 2

I-IS, su-IS summary, L1-IS-level-1, L2-IS level-2

Ia-IS inter area, *-candidate default, U-per-user static route

O-ODR, P-periodic downloaded static route

 

Gateway of last resort is not set

 

1.0.0.0/32 is subnetted, 3 subnets

O ia 1.1.1.1 [110/193] via 10.0.3.1, 00:09:25, Serial1/0

O ia 1.1.3.1 [110/193] via 10.0.3.1, 00:09:25, Serial1/0

O ia 1.1.2.1 [110/193] via 10.0.3.1, 00:09:25, Serial1/0

4.0.0.0/24 is subnetted, 3 subnets

C 4.4.1.0 is directly connected, Loopback1

C 4.4.2.0 is directly connected, Loopback2

C 4.4.3.0 is directly connected, Loopback3

10.0.0.0/24 is subnetted, 3 subnets

O ia 10.0.2.0 [110/128] via 10.0.3.1, 00:09:35, Serial1/0

C 10.0.3.0 is directly connected, Serial1/0

O ia 10.0.1.0 [110/192] via 10.0.3.1, 00:09:25, Serial1/0

 

On R2 (ABR) and R3 (ABR), the networks in area 1 and Area 2 are summarized, and area 1 1.1.1.0-1.1.3.0 is summarized into 1.1.0.0/22, configure area 2 4.4.1.0-4.4.3.0 to 4.4.0.0/22 as follows:

 

R2 (config) # router ospf 1

R2 (config-router) # area 1 range 1.1.0.0 255.255.252.0

 

R3 (config) # router ospf 1

R3 (config-router) # area 2 range 4.4.0.0 255.255.252.0

 

Route table after configuration is summarized:

 

R1 # show ip route

Codes: C-connected, S-static, R-RIP, M-mobile, B-BGP

D-OSPF, EX-VPN external, O-OSPF, IA-OSPF inter area

N1-ospf nssa external type 1, N2-ospf nssa external type 2

E1-OSPF external type 1, E2-OSPF external type 2

I-IS, su-IS summary, L1-IS-level-1, L2-IS level-2

Ia-IS inter area, *-candidate default, U-per-user static route

O-ODR, P-periodic downloaded static route

 

Gateway of last resort is not set

 

1.0.0.0/24 is subnetted, 3 subnets

C 1.1.1.0 is directly connected, Loopback1

C 1.1.2.0 is directly connected, Loopback2

C 1.1.3.0 is directly connected, Loopback3

4.0.0.0/22 is subnetted, 1 subnets

O ia 4.4.0.0 [110/193] via 10.0.1.2, 00:04:23, Serial1/1 // summarized route

10.0.0.0/24 is subnetted, 3 subnets

O ia 10.0.2.0 [110/128] via 10.0.1.2, 01:04:01, Serial1/1

O ia 10.0.3.0 [110/192] via 10.0.1.2, 00:27:11, Serial1/1

C 10.0.1.0 is directly connected, Serial

 

R2 (config-router) # do show ip route

Codes: C-connected, S-static, R-RIP, M-mobile, B-BGP

D-OSPF, EX-VPN external, O-OSPF, IA-OSPF inter area

N1-ospf nssa external type 1, N2-ospf nssa external type 2

E1-OSPF external type 1, E2-OSPF external type 2

I-IS, su-IS summary, L1-IS-level-1, L2-IS level-2

Ia-IS inter area, *-candidate default, U-per-user static route

O-ODR, P-periodic downloaded static route

 

Gateway of last resort is not set

 

1.0.0.0/8 is variably subnetted, 4 subnets, 2 masks

O 1.1.1.1/32 [110/65] via 10.0.1.1, 00:05:28, Serial1/0

O 1.1.0.0/22 is a summary, 00:05:28, Null0

O 1.1.3.1/32 [110/65] via 10.0.1.1, 00:05:28, Serial1/0

O 1.1.2.1/32 [110/65] via 10.0.1.1, 00:05:28, Serial1/0

4.0.0.0/22 is subnetted, 1 subnets

O ia 4.4.0.0 [110/129] via 10.0.2.2, 00:04:54, Serial1/1 // summarized route

10.0.0.0/24 is subnetted, 3 subnets

C 10.0.2.0 is directly connected, Serial1/1

O ia 10.0.3.0 [110/128] via 10.0.2.2, 00:05:28, Serial1/1

C 10.0.1.0 is directly connected, Serial1/0

 

R3 (config-router) # do show ip route

Codes: C-connected, S-static, R-RIP, M-mobile, B-BGP

D-OSPF, EX-VPN external, O-OSPF, IA-OSPF inter area

N1-ospf nssa external type 1, N2-ospf nssa external type 2

E1-OSPF external type 1, E2-OSPF external type 2

I-IS, su-IS summary, L1-IS-level-1, L2-IS level-2

Ia-IS inter area, *-candidate default, U-per-user static route

O-ODR, P-periodic downloaded static route

 

Gateway of last resort is not set

 

1.0.0.0/22 is subnetted, 1 subnets

O ia 1.1.0.0 [110/129] via 10.0.2.1, 00:05:27, Serial1/0 // summarized route

4.0.0.0/8 is variably subnetted, 4 subnets, 2 masks

O 4.4.0.0/22 is a summary, 00:05:27, Null0

O 4.4.1.4/32 [110/65] via 10.0.3.2, 00:05:27, Serial1/1

O 4.4.2.4/32 [110/65] via 10.0.3.2, 00:05:27, Serial1/1

O 4.4.3.4/32 [110/65] via 10.0.3.2, 00:05:27, Serial1/1

10.0.0.0/24 is subnetted, 3 subnets

C 10.0.2.0 is directly connected, Serial1/0

C 10.0.3.0 is directly connected, Serial1/1

O ia 10.0.1.0 [110/128] via 10.0.2.1, 00:05:27, Serial1/0

 

R4 # show ip route

Codes: C-connected, S-static, R-RIP, M-mobile, B-BGP

D-OSPF, EX-VPN external, O-OSPF, IA-OSPF inter area

N1-ospf nssa external type 1, N2-ospf nssa external type 2

E1-OSPF external type 1, E2-OSPF external type 2

I-IS, su-IS summary, L1-IS-level-1, L2-IS level-2

Ia-IS inter area, *-candidate default, U-per-user static route

O-ODR, P-periodic downloaded static route

 

Gateway of last resort is not set

 

1.0.0.0/22 is subnetted, 1 subnets

O ia 1.1.0.0 [110/193] via 10.0.3.1, 00:06:27, Serial1/0 // summarized route

4.0.0.0/24 is subnetted, 3 subnets

C 4.4.1.0 is directly connected, Loopback1

C 4.4.2.0 is directly connected, Loopback2

C 4.4.3.0 is directly connected, Loopback3

10.0.0.0/24 is subnetted, 3 subnets

O ia 10.0.2.0 [110/128] via 10.0.3.1, 00:28:42, Serial1/0

C 10.0.3.0 is directly connected, Serial1/0

O ia 10.0.1.0 [110/192] via 10.0.3.1, 00:28:32, Serial1/0

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