Subject: Re: Normal to STUB/NSSSA

From: David Lemon <[email-masked]>
Date: Sat, 5 Apr 2003 02:28:40 -0500

A 'simple' stub essentially allows type 1,2 and 3 LSA's into the area.
A 'fully' stub'd area will remove type 3, 4 and 5 from the lsa databases
of the routers within the area.

The only lsa within the area's databases that doesn't describe the
topology is the default route that the abr's inject into the area.

On Sat, 5 Apr 2003, David Lemon wrote:

>
> [email-masked]
> -----Original Message-----
> From: Mailing List [mailto:[email-masked]] On Behalf Of
> Padma Pillay-Esnault
> Sent: Friday, April 04, 2003 8:35 AM
> To: [email-masked]
> Subject: Re: Normal to STUB/NSSSA
>
> Hi
>
> I do not agree with the fact that it should necessarily
> flush its external LSA.
>
> Moving to a stub
> ~~~~~~~~~~~~~~~~
> Whether or not it flushes the LSA doesn't matter as those
> LSAs will not be taken into account by anyone as the
> Advertising router router-lsa has the E-bit clear.
> This will in turn flush the type-4 LSAs (rfc2328 pg 136).
> The router will not be part of the router routing table
> as an ASBR. Hence none of the external LSAs originated by
> that router will be considered for SPF calculation.
>
> So it is an implementation decision to do so. I think it
> is more scalable not to do so .. it reduces traffic.
>
>
> Moving into a NSSA
> ~~~~~~~~~~~~~~~~~~
> You need to flush your type 5 and generated type 7 instead.
> Type 3 kept/flushed - depends on config
>
>
> Padma
>
> >
> > Hi,
> > When a router moves from being part
> > of normal ospf area to internal NSSA/STUB router:
> > 1) Type 5 LSAs should be deleted/flushed.
> >
> > 2) Type 3 can be kept/removed based on
> >    whether import of Type 3 is allowed.
> >
> > Cleaner way would be to re-initialize the
> > area itself and start afresh. This should take
> > care of most things.....
> >
> > vivek
> >
> >
> >
> > -----Original Message-----
> > From: Mailing List [mailto:[email-masked]]On Behalf Of
> John
> > Smith
> > Sent: Friday, 4 April 2003 5:31 PM
> > To: [email-masked]
> > Subject: Normal to STUB/NSSSA
> >
> >
> > Hello,
> > What must a router do when its configured inside a normal area and
> then
> > re-configured to
> > be a part of the stub network OR NSSA network.
> >
> > Should it flush all the AS-External-LSAs it has in its database ..
> What
> > exactly will
> > happen?
> >
> > Thanks in advance,
> > JS
> >
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