- Backbone Area: 1,2,3,4,5
- Non-Backbone Area, non-stub: 1,2,3,5,
- Stub: 1,2,3,4
- Totally stubby: 1,2 (except also for type-3 default route)
- Not-so-stubby: 1,2,3,4,7
- stub: area number stub, 1,2,3,4
- totally stubby: area number stub no-summary,1,2 def 3
- no-so-stubby: area number nssa,1,2,3,4,7
- not-so-totally-stubby: area 1 nssa no-summary ,1,2,def 3, 7
Source: TCP/IP Vol1, page 484