I think the behavior which you said is also not compliant with the RFC mentioned.
However my opinion is that, the ABR who is doing the conversion will set the E bit in its router LSA on area 0; by seeing this router LSA the other ABRs connected to the Area 0 will generate the ASBR summary and flood it to their connected non-area-zero routers. I dont see a reason for the NSSA ABR to generate a type-4 LSA within Area 0. Please correct me if i am wrong. Thanks. Muruganandham On Tue, Apr 19, 2011 at 5:34 PM, Adam <[email protected]> wrote: > If I recall correctly, the ABR that translates Type7 into Type5 > (highest RID) shows up in the backbone and other non-backbone areas as > ASBR, because it changes the Advertising router to itself while > performing translation from Type 7 and generating Type5 into Area 0. > So in areas other than the NSSA (where prefix was injected), you > should not see the "real" ASBR as Advertising Router, you should see > the ABR that performed the 7-to-5 translation listed in that field. > > Regards, > Adam > > On Tue, Apr 19, 2011 at 4:08 PM, Muruganandham M <[email protected]> > wrote: > > Dear Experts, > > > > As per RFC 3101, *The OSPF Not-So-Stubby Area (NSSA) Option*, > listed > > in the Juniper supported standards, > > > > Since Type-5 AS-external-LSAs are not flooded > > into NSSAs, NSSA border routers should not originate Type-4 summary- > > LSAs into their NSSAs. Also an NSSA's border routers never originate > > Type-4 summary-LSAs for the NSSA's AS boundary routers, since Type-7 > > AS-external-LSAs are never flooded beyond the NSSA's border. > > > > This looks to be the same behavior in CISCO also. > > > > But JUNIPER router (ABR) does generate the ASBR summary (type 4) for > > the NSSA ASBR. Is there any specific reason for doing this > > implementation? Or Juniper follows any other RFC for this behavior? > > > > -- > > Thanks > > Muruganandham M > > _______________________________________________ > > juniper-nsp mailing list [email protected] > > https://puck.nether.net/mailman/listinfo/juniper-nsp > > > -- Thanks Muruganandham M _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
