Vasmi,
Both your assertions are correct. It should also be noted that in
both cases a single Type-3 LSA is injected by Backbone ABR's into the
stub/totally-stubby area to provide a default route toward the ABR.
In case #1, this adds another Type-3 LSA to the total count of Type-3
LSA's in the stub area. In case #2, only a single Type-3 LSA will
appear in routers in the stub area.
Perhaps one way to distinguish the two areas is, in the case of stub
areas, Type-3 LSA's are leaked from the Backbone ABR to all stub area
routers. This permits stub area routers to make their own optimal
routing decision toward an IGP aggregate. On the other hand, totally
stubby area routers don't have this information so they have no choice
but use the default route toward a Backbone ABR which can then make an
optimal routing decision toward the final destination.
-shane
On Sat, Dec 16, 2000 at 03:46:04PM -0500, Vamsi_Gadireddy wrote:
> 1. In a Stub area, are Type 4 LSA's also blocked in addition to Type 5
> LSA's?
> 2. In a totallly Stubby area, are Type 3 LSA's blocked in addition to Type
> 4,5 LSA's?
>
> The information regarding their difference is not clear as in some books
> its written that Stub area blocks Type 4,5 where as in some books its
> written that it blocks only Type 5.
> Same with the Totally Stubby areas.
>
> Any help would be highly appreciated.
>
> Thanks & Regards,
> Vamsi
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