Friday, May 8, 2009

OSPF Chapter 9 Completed

After about 4 hours of reading theory and labbing OSPF configurations with GNS3, I believe I have the basic concepts of this routing protocol down. It wasn't nearly as bad as I thought it would be but I did get tripped up over the initial configuration. First I tried creating a simple 3 router topology using a simulator program called Packet Tracer. However I noticed that OSPF protocol would never start, after a little research it turns out that OSPF doesn't even work for Packet Tracer! I had to use the GNS3 emulating program that uses the actual IOS to implement the protocol. I still had problems though until I realized that I was in correctly inputting my wild-card masks. I was using "10.0.0.0 0.0.0.0" as the subnets I wanted OSPF to look at. I failed to realize that when you use 0.0.0.0 you're pretty much telling the router to look for that specific subnet number. Once I changed the logic to "10.o.o.o 0.255.255.255" on all the routers OSPF sub-commands everything came up perfectly :)

(P.S. when you use 255 intead of 0's in the wild card mask you're pretty much telling the router to ignore that whole octect. So when I put 0.255.255.255 instead I told the router to look for any subnets with 10 in the first octect number but ignore looking for any specific numbers in the other octects.)

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