SUMMARAISATION  

Friday, November 14, 2008

I WENT AGAIN CONFUSED IN SUMMARAISATION WHILE CONFIGURING .... WHETHER TO USE AREA RANGE OR SUMMARY COMMAND .. USED THE OTHER AND COULDNT SEE THE SUMMARY SO AGAIN USED THE ONE WHICH I DINT USED AS SAW THE SUMMARY ADDRESS .. DONT COMMIT THESE SORT OF MISTAKES OR ILL CONCEPTS .. AFTER STUDYING DO WE NEED TO USE HIT AND TRIAL METHODS .. NO WAYS RIGHT ?



REMEMBER TWO SUMMARAISATIONS

INTER AREA SUMMARASIATION ---- MUST AND SHOULD BE DONE ON ABR --- DONE IS ROUTING PROC OF OSPF OBVIOUSLY AREA RANGE

EXTERNAL SUMMARAISATION ---- MUST AND SHOULD BE DONE ON ASBR --- DONE ON INTERFACE -- IP SUMMARY -- THIS IS ALSO OBVIOUS THINK IT ..


so here it is the interarea summaraisation we are looking so perform it on abr ... so now again .. we created a virtual link ... and abr in the sense you should go to r3 and dont commit mistake going to r2 ... yes now r3 is also an abr and we can summaraise on it .... be careful ..

CODE
r3(config-router)#area 100 range 192.168.100.0 255.255.252.0


CODE
r1#sir
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

172.30.0.0/30 is subnetted, 1 subnets
C 172.30.30.0 is directly connected, Loopback30
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
C 10.1.12.0/24 is directly connected, Serial2/0
O IA 10.1.3.1/32 [110/129] via 10.1.12.2, 00:19:23, Serial2/0
O IA 10.1.2.0/24 [110/65] via 10.1.12.2, 00:19:23, Serial2/0
C 10.1.1.0/24 is directly connected, Loopback1
O IA 10.1.23.0/24 [110/128] via 10.1.12.2, 00:19:23, Serial2/0
O IA 192.168.100.0/22 [110/129] via 10.1.12.2, 00:19:23, Serial2/0
r1#
as#2
[Resuming connection 2 to r2 ... ]

r2#sir
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 10.1.12.1 to network 0.0.0.0

172.30.0.0/32 is subnetted, 1 subnets
O 172.30.30.1 [110/65] via 10.1.12.1, 00:19:22, Serial2/0
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
C 10.1.12.0/24 is directly connected, Serial2/0
O 10.1.3.1/32 [110/65] via 10.1.23.2, 00:19:22, Serial2/1
C 10.1.2.0/24 is directly connected, Loopback2
O 10.1.1.1/32 [110/65] via 10.1.12.1, 00:19:22, Serial2/0
C 10.1.23.0/24 is directly connected, Serial2/1
O*E2 0.0.0.0/0 [110/1] via 10.1.12.1, 00:19:22, Serial2/0
O IA 192.168.100.0/22 [110/65] via 10.1.23.2, 00:19:22, Serial2/1
r2#


hence summaraisation in full effect

one last point

CODE
r3(config-router)#do sir
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 10.1.23.1 to network 0.0.0.0

172.30.0.0/32 is subnetted, 1 subnets
O 172.30.30.1 [110/129] via 10.1.23.1, 00:20:46, Serial2/1
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
O 10.1.12.0/24 [110/128] via 10.1.23.1, 00:20:46, Serial2/1
C 10.1.3.0/24 is directly connected, Loopback3
O 10.1.2.0/24 [110/65] via 10.1.23.1, 00:20:46, Serial2/1
O 10.1.1.1/32 [110/129] via 10.1.23.1, 00:20:46, Serial2/1
C 10.1.23.0/24 is directly connected, Serial2/1
C 192.168.102.0/24 is directly connected, Loopback102
C 192.168.103.0/24 is directly connected, Loopback103
C 192.168.100.0/24 is directly connected, Loopback100
C 192.168.101.0/24 is directly connected, Loopback101
O*E2 0.0.0.0/0 [110/1] via 10.1.23.1, 00:20:46, Serial2/1
O 192.168.100.0/22 is a summary, 00:20:57, Null0 -------------------------> this is avoid routing loops ..when address converd by summary is pinged but not on routing table

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