[nsp] OSPF NSSA

[Stephen J. Wilcox]

distribute-list ?

On Tue, 10 Feb 2004, John Pang wrote:

> Hi Oliver,
> 
> Thanks for the info.
> 
> One main reason why I ran NSSA was because R1 & R4 are
> also redistributing static/connected routes and I
> would like to limit the number of external routes that
> enter R4 since R4 can basically just pass the traffic
> to either R1/R2 and doesn't need to see everything
> else that R1 redistributes.
> 
> Do you have any idea what could be done to achieve
> this effect? Maybe some filtering in normal OSPF area
> mode?
> 
> Best regards,
> 
> --- "Oliver Boehmer (oboehmer)" <oboehmer at cisco.com>
> wrote:
> > > 
> > > I am currently trying out OSPF on the following
> > lab
> > > network:
> > > 
> > > R - R2 - R
> > > 1 - R3 - 4
> > > 
> > > * R1 is connected to both R2 and R3 via router FE
> > > ports
> > > * R4 is connected to both R2 and R3 via router FE
> > > ports
> > > 
> > > R1, R2 & R3 are in Area 0 while R2, R3 & R4 are in
> > > Area 1.
> > > 
> > > In default configuration, R1 is able to see two
> > paths
> > > to R4 via either R2 or R3.
> > > 
> > > However, after I configured Area 1 as a NSSA, R1
> > only
> > > saw 1 path to R4 via R3.
> > > 
> > > Does anyone know why R1 only saw 1 path to R4 when
> > > Area 1 is in NSSA mode? Is it possible for R1 to
> > see
> > > the same two paths to R4 when Area 1 is in NSSA
> > mode?
> > 
> > This is expected behavior. There is only one
> > Type7-Type5 translator with
> > OSPF-NSSAs, so only one of the two NSSA-ABRs will
> > announce the path to
> > R4 into area 0. 
> > 
> > There is a "new" RFC 3101 which allows multiple
> > translators, but support
> > for this is still on our roadmap.
> > 
> > 	oli
> 
> 
> __________________________________
> Do you Yahoo!?
> Yahoo! Finance: Get your refund fast by filing online.
> http://taxes.yahoo.com/filing.html
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>