how can summary on ABR with all subnets,it just summary area it belong

[hoagyoyo]

Hi everyone,

Wish you have anice day!
I have a lab as picture below. The lab request R5 just learn 1 row route 10.0.0.0/8 from ABR R1. How can I summary on R1 all subnets 10.0.0.0/8 behind it, I try configure on R1(config-router)#area 0 range 10.0.0.0 255.0.0.0

But it just summaried subnets 10.x.x.x in area 0, no summary subnets 10.x.x.x  it learned from area 2 and area 3 have  in table summary net link state as picture R1 show ospf database :

R1#

interface Loopback0
ip address 10.1.1.1 255.255.255.255
ip ospf 1 area 0
!
interface Ethernet0/0
ip address 10.1.2.1 255.255.255.0
ip ospf 1 area 0
!
interface Ethernet0/1
ip address 10.1.3.1 255.255.255.0
ip ospf 1 area 0
!

interface Ethernet0/3
ip address 10.1.5.1 255.255.255.0
ip ospf 1 area 1
!
router ospf 1
area 0 range 10.0.0.0 255.0.0.0

R1 OSPF Database

R1#sh ip route ospf

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 18 subnets, 3 masks
O 10.0.0.0/8 is a summary, 13:24:29, Null0
O 10.2.2.2/32 [110/11] via 10.1.2.2, 13:24:29, Ethernet0/0
O 10.2.4.0/24 [110/20] via 10.1.2.2, 13:24:29, Ethernet0/0
O 10.3.3.3/32 [110/11] via 10.1.3.3, 13:24:29, Ethernet0/1
O 10.3.4.0/24 [110/20] via 10.1.3.3, 13:24:29, Ethernet0/1
O IA 10.3.6.0/24 [110/20] via 10.1.3.3, 13:24:29, Ethernet0/1
O 10.4.4.4/32 [110/21] via 10.1.3.3, 13:24:29, Ethernet0/1
[110/21] via 10.1.2.2, 13:24:29, Ethernet0/0
O IA 10.4.7.0/24 [110/30] via 10.1.3.3, 13:24:29, Ethernet0/1
[110/30] via 10.1.2.2, 13:24:29, Ethernet0/0
O 10.5.5.5/32 [110/11] via 10.1.5.2, 13:24:29, Ethernet0/3
O IA 10.6.6.6/32 [110/21] via 10.1.3.3, 13:24:29, Ethernet0/1
O IA 10.7.7.7/32 [110/31] via 10.1.3.3, 13:24:29, Ethernet0/1
[110/31] via 10.1.2.2, 13:24:29, Ethernet0/0
172.20.0.0/24 is subnetted, 2 subnets
O E2 172.20.50.0 [110/20] via 10.1.5.2, 13:24:29, Ethernet0/3
O E2 172.20.70.0 [110/20] via 10.1.3.3, 13:24:29, Ethernet0/1
[110/20] via 10.1.2.2, 13:24:29, Ethernet0/0

R5#show ip route ospf

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 9 subnets, 3 masks
O IA 10.0.0.0/8 [110/11] via 10.1.5.1, 13:29:01, Ethernet0/3
O IA 10.3.6.0/24 [110/30] via 10.1.5.1, 1d01h, Ethernet0/3
O IA 10.4.7.0/24 [110/40] via 10.1.5.1, 1d01h, Ethernet0/3
O IA 10.6.6.6/32 [110/31] via 10.1.5.1, 1d01h, Ethernet0/3
O IA 10.7.7.7/32 [110/41] via 10.1.5.1, 1d01h, Ethernet0/3
172.20.0.0/24 is subnetted, 2 subnets
O E2 172.20.70.0 [110/20] via 10.1.5.1, 1d01h, Ethernet0/3

 

[balaji.bandi]

How can I summary on R1 all subnets behind it

Not many i see there to summary - just 1 subnet with 172.X and 10.X

Area range should be applied on the ABRs when you are trying to summarize routes between OSPF areas. So area range is used to summarize Type 3 LSAs. 

[hoagyoyo]

The lab request R5 just see one row route 10.0.0.0/8 learn from R1, i try summary on R1 it just summary subnets 10.x.x.x form area 0, not summary tolltaly subnets 10.x.x.x form area 0,2,3 like picture.

[MHM Cisco World]

area range used to make one superNET into area instead of inject multi summary address.

area range with no-adveritse make ABR to not inject this prefix "as it show in routing table" into other Area.

Totally NSSA will not have any LSA3 except default 0.0.0.0 LSA3.