[c-nsp] Growing BGP tables

[Rodney Dunn]

In thinking about this some more and I
missed some of the original discussions on this.
What were the most common deployment scenarios
where you would use this?

Single homed boxes or multi homed.

I'm trying to put it together in my head
how it would be done for dual EBGP sessions.

ie:

ISPA                    ISPB
 |                       |
RouterA  --- IBGP --- RouterB

Say I get a /16 and a /24 for a prefix from ISPA with
the same next hop so I wouldn't want to install the
/24.  But what happens if I get a /16 from ISPB and
that gets sent to RouterA.  That prefix would have
a next hop of Router B or ISPB so it would be a different
prefix and installed in the RIB.  Now the traffic that
was originally flowing to the /24 would take the backup
path (due to a longest match lookup) rather than the
path it would have taken if we had installed the original
/24. Would that be acceptable?

And we would have to think about if it would cause
any problems for prefixes you already have in the
RIB from your IGP.

Rodney




On Tue, Nov 23, 2004 at 07:33:45PM -0500, Rodney Dunn wrote:
> Hmmm...
> 
> http://bgp.potaroo.net/ietf/idref/draft-hardie-bounded-longest-match/
> 
> Rodney
> 
> On Tue, Nov 23, 2004 at 09:00:29PM +0100, Gert Doering wrote:
> > Hi,
> > 
> > On Tue, Nov 23, 2004 at 12:33:29PM -0500, Rodney Dunn wrote:
> > > There is a possiblity we could keep the
> > > more specifics out of the RIB which would
> > > save memory there and in the FIB.
> > 
> > This would certainly help the line cards.
> > 
> > gert
> > -- 
> > USENET is *not* the non-clickable part of WWW!
> >                                                            //www.muc.de/~gert/
> > Gert Doering - Munich, Germany                             gert at greenie.muc.de
> > fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de