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ugh, this shit is a mindfuck.




Figure illustrates the example network, including an NSSA implementation. RTA can import external routes as Type 7 LSAs, and ABRs will translate Type 7 LSAs into Type 5 LSAs as they leave the NSSA. A benefit of Type 7 LSAs is that they can be summarized. The OSPF specification prohibits the summarizing or filtering of Type 5 LSAs. It is an OSPF requirement that Type 5 LSAs always be flooded throughout a routing domain. When defining an NSSA, specific external routes can be imported as Type 7 LSAs into the NSSA. In addition, when translating Type 7 LSAs to be imported into nonstub areas, the LSAs can be summarized or filtered before importing them as Type 5 LSAs.

NSSAs are often used when a remote site, which uses RIP or IGRP, must be connected to a central site using OSPF. Use NSSA to simplify the administration of this kind of topology. Before NSSA, the connection between the corporate site ABR and the remote router used RIP or EIGRP. This meant maintaining two routing protocols. Now, with NSSA, OSPF can be extended to handle the remote connection by defining the area between the corporate router and the remote router as an NSSA.
 
i'm sure millions of you wonder what it would be like to wear the tights of JUSTICE!!! well... it's tingly, it's uncomfortable, but it's get the job done! And oh what a job it does!!!!

... and sometimes you just have to take the rolled up newspaper of justice... "BAD DOG! BAD DOG! BAD DOG!!"
 
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