A network diagram showing different OSPF areas and the LSAs found in each area. Note, STUB area is similar to NSSA and Totally STUB is similar to Totally NSSA. The main difference is …

You don't want to isolate the area from the IP connectivity point of view. You just want to minimize the routing table of the routers sitting in a total stub area. Without the default route pointing to …

OSPF external route has default metric of 20 so when you define redistribute route as type-2 (E2), ASBR propagate that route with metric of 20 to OSPF area and all router has metric of 20 to …

The idea here is if there are 100 Type-5 LSAs in the OSPF domain totally and the NSSA needs to flood 100 additional external prefixes into the OSPF domain, then the NSSA only has 100 …

The NSSA-Stub being with just a "area 1 nssa default-information originate" on the ABR. Narbik (or anyone else), do you have a reference document for the distinction in terminology between …

You can use different OSPF process IDs (for Area 0 and 104) and redistribute between the processes. The redistributed routes will be sent as Type 5.

The OSPF not-so-stubby area (NSSA) feature is described by RFC 1587 and is first introduced in Cisco IOS® Software release 11.2. It is a non-proprietary extension of the existing stub area …

A brief description of the different LSA types used in OSPF. From the CCIETalk web site. Title OSPF LSA Types and Descriptions URL Name ospf-lsa-types-and-descriptions Summary

This is a little diagram I found while doing my preperation for CCIE written that helps explain the different OSPF areas and LSA types found in each area. Source is www.ccietalk.com.

The stub flag is related to OSPF area types. The area types determine what type of LSAs can be propagated within the area and, therefore, limit the number of routes that can be learned in …