Hello, I headed over to this video to get a better handle on LSAs and stub areas.: https://www.youtube.com/watch?v=yhPcpssMx7w
( OSPF LSA Types Simplified... Seriously! )
Kevin is a great resource, Thanks Anthony for pointing me there.
I had a question about Stub Areas.. Is it a requirement in a Stub Area to have a zero route (Default Route) pointed at the ABR ?
For example, let's say you have 4 routers all with their own internet connection. Technically that means they are all ASBRs, I realize. But in this case none of them are advertising the default route with the exception of R2.
So your stub area router (Not ABR) has an independent internet connection and a separate point-to-point circuit for the enterprise internal network. If you wanted the point-to-point used for corporate routing, but the local internet circuit used for everything else.... The zero route (static) would have to be pointed at the internet connection in this case.
The Type 3 LSAs from R2 into the stub area would at least tell the stub area how to get to Area 0 internal corporate networks, that's good.. What about other areas ? What about this default route Type 3 LSA from the R2 ABR, we wouldn't want this to override the local internet default route. however we still want to get to other area networks (non-Area 0)
Is the only option to run a Normal OSPF area and forget stub or is there a solution?