Elmer, In short, a totally stubby area blocks all Type 3, 4 and 5 LSAs from entering the stub area. A stub area blocks all Type 4 and 5 LSAs from entering the stub area. Both inject an additional Type 3 into the stub for the default route.
>From the perspective of a stub router, you will see all OSPF networks in all areas, but you will not see any external routes. From the perspective of a router in a totally stubby area, you will see all OSPF networks in the stub area only, but will not see any OSPF networks outside of the stub area. Both will have a single default gateway to the nearest ABR. I hope this helps, - Tom On Tue, 05 Feb 2002 12:29:31 -0500, Cebuano wrote: > Hi, group. > Please clarify this description by Doyle regarding stub and totally > stubby areas. As indicated on page 480... "ABRs at the edge of a stub > area will use Network Summary LSAs [i.e. Type 3?] to advertise a single > default route (destination 0.0.0.0) into the area." > > Then on page 482... > "The ABR of a totally stubby area will block not only AS External LSAs > but also all Summary LSAs - with the exception of a single type 3 LSA to > advertise the default route [i.e. 0.0.0.0, right?] > > So now there doesn't seem to be much difference between the two based on > this explanation. > I always uderstood that the main difference was that Stub areas get a > default route for areas external to their AS while Totally stubby areas > get a default route for areas external to their own area. > > Please someone clarify me on this. > Thanks. > > Elmer > misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=34483&t=34478 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
