In OSPF intra-area (local) routes are chosen over inter-area (external) routes, regardless of AD. Subsequently, E1 is chosen before E2 and N1 is chosen before N2. So, there is a division of which routes are chosen over other routes without using AD.
I've read, "Anatomy of a routing protocol: OSPF" and I'm sure the exact reason was in there, but I am not co-located with the book to look it up. Les On Fri, Mar 16, 2012 at 11:50 AM, manjo vj segar <[email protected]> wrote: > hi , > got this below question from a fiend. > just taught of sharing it with you guys if anyones intrested in aswering > him. > > > Does anyone know why OSPF does not have an external administrative distance > value? Is there a specific reason for it? Was it just an oversight? > > My question is related to redistribution, as in the issues it causes when > redistributing routes into OSPF and the inefficienceis it causes. > > I understand how to fix these inefficiencies, Route Maps, Change AD value > etc, but I was just wondering if anyone knew the reason why OSPF maintains > the AD of 110 irrespective of whether it's advertising Internal or External > routes . > > regards, > > manoj > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com <http://www.platinumplacement.com/> > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > -- Les Waller, Network Engineer Home Page: www.leswaller.com MBA, CISSP, CCNP _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
