Brian,
That's the way they made it. Accept it and be at peace.
The ABR will inject a default route X.X.X.X 0.0.0.0 X.X.X.X into area for other
stub areas. This is so stub area routers know that for anything they don't know,
go here (second X.X.X.X).
All area routers' Link State Databases must match.
The Hello packet E-bit ('stub area' option bit) must be correct on all area
routers since entire Hello Packet must match for adjacencies to form.
Tom Trygar
"Field, Brian" wrote:
> Thomas,
>
> Thanks for the response.
>
> I'm still unclear as to why an area internal router needs
> to know that it is in a stub area. If the ABRs are tagged
> with the stub indicator and are filtering type 5 LSAs from
> being advertised into the area, why would an internal router
> need to be configured to know this?
>
> Suppose we were to remove the stub flag from the Hello protocol.
> All routers in a stub area would then negotitate the two-way
> state and evetually have the same link database.
>
> How would the lack of a router knowing it was in a stub
> area impact OSPF operation on the router? For a Totally
> stubby area, the internal routers are not aware that they're
> in a TSA and won't be receiving type 3/4 LSAs. So why
> must an internal stub router know that it is in a stub?
>
> Thanks
> Brian
>
> -----Original Message-----
> From: Thomas Trygar [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, May 10, 2000 9:08 PM
> To: Field, Brian
> Cc: [EMAIL PROTECTED]
> Subject: Re: OSPF question- stub area
>
> Brain,
>
> All routers within a stub area must have identical Link State Databases.
>
> "Field, Brian" wrote:
>
> > When configuring a stub area, why is it that all routers
> > in the stub area must be tagged as being in a stub?
> >
> > Ok, so the Hello mechanism requires that adjacent routers
> > agree that they are in the same area and both have been
> > configured as being in a stub area.
> >
> > Besides the Hello negotiation, what is the reason for requiring
> > this? Why is it not sufficient to tag the stub area ABRs as
> > being stubs and be done with it (much like is done with the
> > "no-summary" tag being required only in ABRs to a totally
> > stubby area)?
> >
> > Thanks
> > Brian
> >
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