Can I prevent OSPF from advertising a specific network on an interface
in [Cisco]
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From: Stephen on 19 Mar 2010 19:25 On Thu, 18 Mar 2010 07:47:44 -0700 (PDT), ve7eje <ve7eje(a)gmail.com> wrote: >Is there a way to tell OSPF to not advertise a specific network on a >spefic interface without stopping the adverts of other networks? >Example >Router has 5 interfaces >F1 is a link to another router >F2 is a link to another router >F3 = netB >F4 = netC >F5 = netD > >I need nets BCD to be advertised out F1 and F2 but not each other. >Similarly I need nets learned on F1 and F2 to be advertised on F1, F2 >and F3 only. as the other posters said - OSPF works by replicating the link state database to other OSPF routers within the area. However - advertising the OSPF topology (or not) only matters if there is another router on net BCD. so - dont run OSPF on those interfaces (or operate in passive). If this router doesnt have 2 way OSPF comms with another router it will not form an adjacency and cannot exchange routes. > >I've looked at the passive interface command but I don't think it will >do what I want. > it does sound like a different protocol may be the best way to do this - BGP? >Thanks -Rob- -- Regards stephen_hope(a)xyzworld.com - replace xyz with ntl
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