[nsp] OSPF NSSA
whoami1234_1234 at yahoo.com
Tue Feb 10 14:22:08 EST 2004
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
--- "Oliver Boehmer (oboehmer)" <oboehmer at cisco.com>
> > I am currently trying out OSPF on the following
> > 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
> > to R4 via either R2 or R3.
> > However, after I configured Area 1 as a NSSA, R1
> > 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
> > the same two paths to R4 when Area 1 is in NSSA
> 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.
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