Need you suggestion to configure the NSSA area. What would be the best practice to configure NSSA? Can we make area0 as NSSA, if we can not make area 0 nssa can some on please help me to understand why? Thanks for you suggestions.
area 0 is a Type-5 (external routing information) capable area by definition, a NSSA is not Type-5 capable.
So area 0 always has to be a non-stub/regular area in order to be able to flood Type-5 LSAs into other non-stub areas.
A NSSA reduces the size of the LSDB similar to what stub areas do (there is also a totally option), but in contrast to stub areas you can inject external routing information. For this purpose, a new type of external LSAs was introduced (7) which has a scope limited to the NSSA, but can be translated into AS-wide Type-5 LSAs by a NSSA Border Router.
Well, you can place an ASBR in every Type-5 capable area and in a NSSA as well. An ASBR can even be an ABR at the same time.
Unlike internal LSAs, Type-5 LSAs are flooded unchanged among all non-stub areas and their inter-area reachability is achieved by evaluating a special field (Forwarding Address) or, if not set, the Type-4 LSA for the advertising ASBR. Stub areas have to rely on their default-routes to reach external networks.
This concepts can be somewhat confusing, feel free to ask further.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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