Brian,
I'm not sure on the exact details but I do know because I've tried this...
If you don't configure all routers in the stub area to tell them they are
all in a stub area they will not establish adjacancies with each other.
Because some will think they are stub and some not. So to put it
simply... No worky.
Cory
-----Original Message-----
From: Field, Brian [mailto:[EMAIL PROTECTED]]
Sent: Thursday, May 11, 2000 4:51 AM
To: Thomas Trygar
Cc: [EMAIL PROTECTED]
Subject: RE: OSPF question- stub area
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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