** excuse the change of address/name - have migrated between providers. DSL now :-) Nnanna, thanks for the reply - I'm pretty certain that this is a solution to a different problem. If you look closely at the text, what is being achieved is avoiding additional hops within an area by having non-ASBR routers forward directly to the target router outside the AS (OSPF meaning, not BGP), rather than add a hop and transit the ASBR itself. cheers anyway Andy Nnanna Obuba wrote on July 18, 2001 at 10:54 PM: > > I believe you can actually suppress the external routes....take a look at > the link below. This actually shows you how to prevent accidental supression > of external routes, but with a little creativity, you can make it work for > you.. > > > http://www.cisco.com/warp/public/104/10.html > > > Nnanna > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > [EMAIL PROTECTED] > Sent: Wednesday, July 18, 2001 3:35 PM > To: [EMAIL PROTECTED] > Subject: Re: LSA type-5 suppression across OSPF area boundaries?? > [7:12862] > > > hi all, > > thanks for all the replies - gave me some stuff to chew over > > have been looking into this some more - it's still bugging me. > > my investigations revealed: > > * making the area stub or total-stub will not work as type-5s are not > permitted in the area. all routers set E=0 in the options field to denote > stub, and won't talk to non-stub neighbors. no fooling them apparently... > > * summary-address will only summarize external routes originated on that > local router - hence cannot use to summarize for non-local type-5s > > I cannot believe that it is not possible to do something as simple as this > without resorting to multiple OSPF instances and redistributing between > them!! > > cheers > > Andy > > Peter Van Oene wrote on July 13, 2001 at 6:43 PM: > > > > Making the area stub will explicitly deny the use of type 4/5 in the area, > > hence, this should not work. Summarization at the ABR would make the most > > sense to me. Odd that it doesn't seem to work. > > > > pete > > > > *********** REPLY SEPARATOR *********** > > > > On 7/12/2001 at 6:40 PM John Neiberger wrote: > > > > >Could you accomplish this by making the area containing the ASBR a > > >stubby area? IIRC, you can put an ASBR inside a stubby area but the > > >Type-5 LSAs will not leave the area. I'm not sure about that, but I'd > > >swear I read that somewhere recently. > > > > > >Okay, I just checked this in Giles, 2nd edition. According to him, the > > >above is true. But who knows if it works in the real world. > > > > > >Good luck! > > > > > >John > > > > > >>>> "[EMAIL PROTECTED]" > > > 7/12/01 1:58:11 PM >>> > > >hi all, > > > > > >have a problem that has been nagging at me for a good long time now... > > > > > >say you have a pair of ABRs sitting at an OSPF area boundary, and an > > >ASBR is > > >originating Type-5 LSAs from inside the non-backbone area. Is there an > > >easy > > >way to suppress the propagation of the type-5s outside the area? I > > >would > > >have a range statement on the ABRs to advertise the area aggregate, I > > >just > > >want to suppress the more specifics. > > > > > >I have tried using 'distribute-list out ' which would do it for > > >me, but for some reason IOS won't allow this with OSPF: > > > > > >router(config)#router os 1 > > >router(config-router)#distribute-list 1 out FastEthernet 0/0 > > >% Interface not allowed with OUT for OSPF > > >router(config-router)# > > > > > >I suppose that allowing this could potentially screw up routing if > > >done > > >without some care, but JunOS lets you do exactly this sort of thing - > > >you > > >can produce some wacky policies, but at least you have the option ;-) > > > > > >btw - I know I could prolly do this with multiple OSPF instances and > > >redistribute between them, but I *really* don't want to get into this > > >level > > >of complexity. > > > > > >thanks in advance - this one has been driving me mad > > > > > >Andy > _________________________________________________________ > Do You Yahoo!? > Get your free @yahoo.com address at http://mail.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=12890&t=12890 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
