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 > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=34480&t=34478 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
