Very good video: https://www.youtube.com/watch?v=cM3OI_ZyRuQ&ab_channel=CCIEQuickStudy
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| Stub Area | Only local and other area ( no external route ) | set protocols ospf area 0.0.0.7 stub |
| Totally Stubby Area | only local + default (no ext and other Area route ) default-metric ( adv 0/0 ) + no-summaries ( no LSA3) | set protocols ospf area 0.0.0.7 stub no-summaries + |
| Not-So-Stubby Area or NSSA | On area border routers only, for a not-so-stubby area (NSSA), inject a default link-state advertisement (LSA) with a specified metric value into the area. The default route matches any destination that is not explicitly reachable from within the area. | set protocols ospf area 0.0.0.7 nssa default-lsa default-metric 10 |
