[j-nsp] How to prevent black-hole in NSSA

[AM Shaikh]

Hi Michael

If I understand it correct your problem is due to the
OSPF behaviour in case of more than one ABR in an NSSA
... by nature of ospf only one router will do the type
7 to type 5 translation. That might result in
suboptimal routing sometimes as routers in other areas
will know to reach the nssa externals only via the
advertising ABR.

Here the ABR with higher router will perform the
translation.

If you know which path would be optimal, then I guess
you will have to manually make the preferred ABR to
have higher router-id.

Hope this helps.

Cheers,
AMS
--- Michael <wsf at vodatelsys.com> wrote:
> Hi, guys 
> 
> could you pls explain How to prevent black-hole in
> NSSA.
> 
> Let say there are four  routers in area 10 which is
> NSSA, two ABR
> connected to the backbone. one router redistribute
> external route
> to the NSSA area.
> 
> as i know we should do something in two ABR JUNIPER
> router, in order to
> prevent blackhole.
> 
> from other area, to trace the external route, we
> would find that the
> route is not gone through the shortest path, it
> means have blackhole in
> the NSSA area.
> 
> 
> 
> -- 
> Michael <wsf at vodatelsys.com>
> 
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> http://puck.nether.net/mailman/listinfo/juniper-nsp


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