Hi.. I am posting Not-So Stub Area in OSPF configurations.It is often time used when our ASBR router in not on backbone areas or we are redistributing different Routing protocol with ordinary areas(Not back-bone area).
Redistribution into NSSA create special-type of link in OSPF. In NSSA-ASBR router generate LSA-7 and NSSA-ABR router converted into LSA-5. Here In NSSA Area LSA-4 and LSA-5 are blocked but allowed LSA-3, In totally NSSA stub area allowed only summary route.
It is very carefully care when you plan for NSSA area in OSPF domain.
Please See below Figure First and Check Configurations.
:Router Configurations:
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip cef
!
!
!
!
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
ip address 192.168.1.1 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface FastEthernet1/0
ip address 1.1.1.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/1
no ip address
shutdown
duplex auto
speed auto
!
router ospf 1
log-adjacency-changes
redistribute rip metric 30 subnets
network 1.1.1.0 0.0.0.255 area 2
default-information originate always
!
router rip
version 2
redistribute ospf 1 metric 3
network 192.168.1.0
no auto-summary
!
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
stopbits 1
line aux 0
line vty 0 4
!
!
end
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip cef
!
!
!
!
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface FastEthernet1/0
ip address 1.1.1.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/1
ip address 2.2.2.1 255.255.255.0
duplex auto
speed auto
!
router ospf 1
log-adjacency-changes
network 1.1.1.0 0.0.0.255 area 2
network 2.2.2.0 0.0.0.255 area 0
!
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
stopbits 1
line aux 0
line vty 0 4
!
!
end
*Jun 17 14:12:02.859: %SYS-5-CONFIG_I: Configured from console by consoleun
R3#show running-config
Building configuration...
Current configuration : 1431 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip cef
!
!
!
!
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface FastEthernet1/0
ip address 2.2.2.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial2/0
ip address 3.3.3.1 255.255.255.0
serial restart-delay 0
clock rate 64000
!
interface Serial2/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/3
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/4
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/5
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/6
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/7
no ip address
shutdown
serial restart-delay 0
!
router ospf 1
log-adjacency-changes
area 1 nssa
network 2.2.2.0 0.0.0.255 area 0
network 3.3.3.0 0.0.0.255 area 1
!
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
stopbits 1
line aux 0
line vty 0 4
!
!
end
R3#
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R4
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip cef
!
!
!
!
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface Serial1/0
ip address 3.3.3.2 255.255.255.0
serial restart-delay 0
clock rate 64000
!
interface Serial1/1
ip address 4.4.4.1 255.255.255.0
serial restart-delay 0
clock rate 64000
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/4
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/5
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/6
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/7
no ip address
shutdown
serial restart-delay 0
!
router ospf 1
log-adjacency-changes
network 3.3.3.0 0.0.0.255 area 1
network 4.4.4.0 0.0.0.255 area 1
!
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
stopbits 1
line aux 0
line vty 0 4
!
!
end
R5#show running-config
*Jun 17 14:18:15.027: %SYS-5-CONFIG_I: Configured from console by console
Building configuration...
Current configuration : 1432 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R5
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip cef
!
!
!
!
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
ip address 172.16.1.1 255.255.0.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface Serial1/0
ip address 4.4.4.4 255.255.255.0
serial restart-delay 0
clock rate 64000
!
interface Serial1/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/4
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/5
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/6
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/7
no ip address
shutdown
serial restart-delay 0
!
router eigrp 1
redistribute ospf 1 metric 10000 100 1 255 1500
network 172.16.0.0
no auto-summary
!
router ospf 1
log-adjacency-changes
area 1 nssa
redistribute eigrp 1 metric 30 subnets
network 4.4.4.0 0.0.0.255 area 1
!
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
stopbits 1
line aux 0
line vty 0 4
!
!
end
R5#
Thank you,
Regards,
Jignesh
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