From: Peter Van Oene (pvo@xxxxxxxxxxxx)
Date: Thu Jun 07 2001 - 10:26:31 GMT-3
I would define a area by what LSA's flow within it. As NSSA areas, like stub a
reas, filter Type 4/5 LSAs (anything having to do with external information) th
en the fit into the category of stubs. The only reason one creates a stub is
to filter type 5's and NSSA's do this quite nicely.
*********** REPLY SEPARATOR ***********
On 6/7/2001 at 6:39 PM Jason1 wrote:
>Chuck,
>
>I'm aware that NSSA is a type of area, but in looking through the RFC1587,
>it never refer to the NSSA as a stub area or a type of stub area.It refer
>to
>NSSA as a new type of area, which I agree with, I'm just in disagreement
>with the idea that NSSA is a type of stub area simply because it doesn't
>meet the requirement of a stub area in the first place.
>
>Forgive me if this question sounds dumb because I'm trying to question
>something that I assume has been accepted by most people... So far all the
>comments/replies I've received cliams that NSSA is a type of stub area and
>all refer me back to RFC1587. So either I'm not reading it right, or else
>everybody is reading it wrongly.
>
>In fact, I quote the following from the RFC which seems to implied that
>NSSA
>is NOT a stub area.
>
>----------
>It should also be noted that unlike stub areas, all OSPF summary
> routes (type-3 LSAs) must be imported into NSSAs. This is to ensure
> that OSPF internal routes are always chosen over OSPF external
> (type-7) routes.
>----------
>
>If anybody could give me a definite answer, it would be greatly
>appreciated...
>
>Jason Wong
>
>
>----- Original Message -----
>From: "Chuck Larrieu" <chuck@cl.cncdsl.com>
>To: "Jason1" <jason1@v-labs.net>; <ccielab@groupstudy.com>
>Sent: Wednesday, June 06, 2001 9:08 PM
>Subject: RE: Is NSSA a type of stub area or is it not ?
>
>
>> Yes. :->
>>
>> Refer to RFC 1587 ftp://ftp.isi.edu/in-notes/rfc1587.txt
>>
>> "Abstract
>>
>> "This document describes a new optional type of OSPF area, somewhat
>> humorously referred to as a "not-so-stubby" area (or NSSA). NSSAs are
>> similar to the existing OSPF stub area configuration option but have the
>> additional capability of importing AS external routes in a limited
>fashion.
>> "
>>
>> "Proposed Solution
>>
>> "This document describes a new optional type of OSPF area, somewhat
>> humorously referred to as a "not-so-stubby" area (or NSSA) which has the
>> capability of importing external routes in a limited fashion. "
>>
>> The NSSA was developed to solve particular problems caused by limitations
>of
>> the original OSPF specification, to whit, the importation of external
>routes
>> into what otherwise was considered an OSPF stub area.
>>
>> You may want to add the IETF link to your references.
>>
>> HTH
>>
>> Chuck
>>
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>> Jason1
>> Sent: Wednesday, June 06, 2001 5:19 AM
>> To: ccielab@groupstudy.com
>> Subject: Is NSSA a type of stub area or is it not ?
>>
>> Is NSSA a type of stub area or is it not ? :-)
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