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WRITTEN BY RENE MOLENAAR ON�21 JUNE 2010. POSTED IN�OSPF
As a network engineer you are familiar with the concepts of�OSPF�and single-area implementations, however you never tried to create a multi-area�ospf�configuration. You have heard about different area types like�stubby,�not so stubby�but never encountered them in real life. You boot up your good old routers and prepare for the lab to change this once and for all.
* All IP addresses have been preconfigured for you.
* Configure OSPF on all routers, achieve full connectivity. Make sure you can ping any IP Address from all routers. All networks should be in Area 0.
* Manually set the Router-ID of R1 to 126.96.36.199, make sure if you look at R2 or R3 that you really see the new router ID.
* Change OSPF so R3 becomes the designated router on the 192.168.34.X segment.
* Change the metric on the link between R1 and R2, do not use the ip ospf cost command for this.
* Change the reference bandwidth on all routers to 1500.
* Enable cleartext authentication between R2 and R4.
* Enable MD5 authentication between R3 and R4.
* On the link between R2 and R4, change the hello timer to 1 seconds and the dead-interval to 6 seconds.
* Insert a default route on R4 so that you see a 0.0.0.0/0 route in the routing table of R1, R2 and R3.
* Shutdown the link between R2 and R4.
* The link between R1 and R2, and R2's loopback interface should be configured as area 1.
* Configure area 1 as a not so stubby area (nssa).
* Configurea R4's loopback0 interface as area 2.
* Create 4 loopbacks on R4:
Loopback10: 172.16.0.1 /24
Loopback11: 172.16.1.1 /24
Loopback12: 172.16.2.1 /24
Loopback13: 172.16.3.1 /24
* Advertise these networks in OSPF area 2 but make sure you only see a single entry (172.16.0.0 /22) in the routing table of R1,R2 and R3.
* Create another loopback on R4:
Loopback14: 172.16.4.1 /24
* You are not allowed to advertise this loopback in OSPF or by using�redistribution. Ensure other routers can reach this loopback.