Elmer, There are no bits set, TSSAs are Cisco-proprietary. TSSAs are configured only on the ABRs. Non-ABRs in the stub area have no idea that they are in a TSSA.
- Tom On Tue, 05 Feb 2002 13:59:56 -0500, Cebuano wrote: > Exactly. And to add to the LSA-confusion, NSSA'a get a default Type 7 > with the command > nssa no-redistribution default-information-originate. But for purely > academic reasons, > I'd like to know what bit is set to inform the neighboring routers in > the Totally stubby area that "we are now operating in totally stubby > mode". Because as we all know, with stub the E-bit is set to 1. > > Thanks for the replies. > Elmer > ----- Original Message ----- > From: "s vermill" > To: > Sent: Tuesday, February 05, 2002 12:41 PM Subject: RE: Doyle on Stub and > Totally Stubby areas [7:34478] > > >> Yes that wording, when directly compared, is a little confusing. But >> you have the right understanding. Stub areas only summarize the AS >> external routes, leaving all of the IA routes in tact. Totally stubby >> areas get > only >> one outside route - whether IA or AS external - 0.0.0.0. >> >> Put in different terms, I think you can say that stub areas replace >> type 5 LSAs with a default and totally stubby areas replace both type 5 >> and 3 > LSAs >> with with a default. I'm not sure that 0.0.0.0 itself exactly fits any >> of the LSA classifications. Seems to be kind of a hybird type 3/5 LSA. >> >> Cebuano wrote: >> > >> > Hi, group. >> > Please clarify this description by Doyle regarding stub and totally >> > stubby areas. As indicated on page 480... "ABRs at the edge of a stub >> > area will use Network Summary LSAs [i.e. Type 3?] to advertise a >> > single default route (destination 0.0.0.0) into the area." >> > >> > Then on page 482... >> > "The ABR of a totally stubby area will block not only AS External >> > LSAs but also all Summary LSAs - with the exception of a single type >> > 3 LSA to advertise the default route [i.e. 0.0.0.0, right?] >> > >> > So now there doesn't seem to be much difference between the two based >> > on this >> > explanation. >> > I always uderstood that the main difference was that Stub areas get a >> > default route for areas external to their AS while Totally stubby >> > areas get a default route for areas external to their own area. >> > >> > Please someone clarify me on this. >> > Thanks. >> > >> > Elmer > misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=34494&t=34478 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
