OSPF LSA Summarization, OSPF LSA Tipleri

[latecollision]

OSPF LSA Type 3 Summarization




OSPF ile summarization sadece area’lar arasında ya da ASBR router’ında yapılabilir. Bu çalışmada ABR olan R2 router’ı üzerinde yapılacak konfigürasyon ile R1 ve R3 routerları üzerinde ki Loopback networklerindiğer area’ ya özetlenmesi sağlanacaktır.

Summarization yapılırken dikkat edilecek nokta kullanacağımız network adresleri ve Subnet Mask’ların özetlemek istediğimiz aralıkları kapsayacak şekilde hesaplanmasıdır.

Önce Summarization yapılmadan konfigürasyonlarımıza ve R1 – R3 routerlarının Routing Table’larına bakalım. Routerların başlangıçtaki konfigürasyonları şöyle olacaktır;









R1 Router’ı

R1#sh running-config
Building configuration...
hostname R1
interface Loopback0
ip address 193.168.1.1 255.255.255.0
ip ospf network point-to-point
!
interface Loopback1
ip address 193.168.2.1 255.255.255.0
ip ospf network point-to-point
!
interface Loopback2
ip address 193.168.3.1 255.255.255.0
ip ospf network point-to-point
!
interface Serial1/0
ip address 10.1.1.1 255.255.255.252
!
router ospf 1
log-adjacency-changes
network 10.1.1.0 0.0.0.3 area 0
network 193.168.1.0 0.0.0.255 area 0
network 193.168.2.0 0.0.0.255 area 0
network 193.168.3.0 0.0.0.255 area 0
!
end
R1#

R2 Router’ı

R2#sh run
Building configuration...

hostname R2
!
interface Serial1/0
ip address 10.1.1.5 255.255.255.252
serial restart-delay 0
!
interface Serial1/1
ip address 10.1.1.2 255.255.255.252
serial restart-delay 0
!
!
router ospf 1
log-adjacency-changes
network 10.1.1.0 0.0.0.3 area 0
network 10.1.1.4 0.0.0.3 area 1
!
ip classless
!
end

R2#





R3 Router’ı

R3#show runnni
Building configuration...

hostname R3
!
!
interface Loopback0
ip address 192.168.1.1 255.255.255.0
ip ospf network point-to-point
!
interface Loopback1
ip address 192.168.2.1 255.255.255.0
ip ospf network point-to-point
!
interface Loopback2
ip address 192.168.3.1 255.255.255.0
ip ospf network point-to-point
!
!
interface Serial1/1
ip address 10.1.1.6 255.255.255.252
!
router ospf 1
log-adjacency-changes
network 10.1.1.4 0.0.0.3 area 1
network 192.168.1.0 0.0.0.255 area 1
network 192.168.2.0 0.0.0.255 area 1
network 192.168.3.0 0.0.0.255 area 1
!
ip classless
end

R3#








R1 ve R3 Rourterlarının Routing Table’ları da şu şekilde oluşmuştur;




R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP 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-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/30 is subnetted, 2 subnets
C 10.1.1.0 is directly connected, Serial1/0
O IA 10.1.1.4 [110/128] via 10.1.1.2, 00:03:26, Serial1/0
C 193.168.1.0/24 is directly connected, Loopback0
O IA 192.168.1.0/24 [110/129] via 10.1.1.2, 00:03:16, Serial1/0
C 193.168.3.0/24 is directly connected, Loopback2
O IA 192.168.2.0/24 [110/129] via 10.1.1.2, 00:03:16, Serial1/0
C 193.168.2.0/24 is directly connected, Loopback1
O IA 192.168.3.0/24 [110/129] via 10.1.1.2, 00:03:16, Serial1/0
R1#



R3#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP 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-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/30 is subnetted, 2 subnets
O IA 10.1.1.0 [110/128] via 10.1.1.5, 00:03:45, Serial1/1
C 10.1.1.4 is directly connected, Serial1/1
O IA 193.168.1.0/24 [110/129] via 10.1.1.5, 00:03:45, Serial1/1
C 192.168.1.0/24 is directly connected, Loopback0
O IA 193.168.3.0/24 [110/129] via 10.1.1.5, 00:03:45, Serial1/1
C 192.168.2.0/24 is directly connected, Loopback1
O IA 193.168.2.0/24 [110/129] via 10.1.1.5, 00:03:45, Serial1/1
C 192.168.3.0/24 is directly connected, Loopback2
R3#







R2 Routerında Summization yapıldıktan sonra R2 OSPF konfigürasyonu ve diğer routerların routing table’ları şu şekilde oluşacaktır;

R2;

!
router ospf 1
log-adjacency-changes
area 0 range 193.168.0.0 255.255.252.0
area 1 range 192.168.0.0 255.255.252.0
network 10.1.1.0 0.0.0.3 area 0
network 10.1.1.4 0.0.0.3 area 1
!
















R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP 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-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/30 is subnetted, 2 subnets
C 10.1.1.0 is directly connected, Serial1/0
O IA 10.1.1.4 [110/128] via 10.1.1.2, 00:09:42, Serial1/0
C 193.168.1.0/24 is directly connected, Loopback0
C 193.168.3.0/24 is directly connected, Loopback2
C 193.168.2.0/24 is directly connected, Loopback1
O IA 192.168.0.0/22 [110/129] via 10.1.1.2, 00:01:08, Serial1/0
R1#







R3#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP 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-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/30 is subnetted, 2 subnets
O IA 10.1.1.0 [110/128] via 10.1.1.5, 00:09:20, Serial1/1
C 10.1.1.4 is directly connected, Serial1/1
C 192.168.1.0/24 is directly connected, Loopback0
C 192.168.2.0/24 is directly connected, Loopback1
C 192.168.3.0/24 is directly connected, Loopback2
O IA 193.168.0.0/22 [110/129] via 10.1.1.5, 00:01:06, Serial1/1
R3#


Kaynak:
Hayrullah Kolukisaoglu