Thank you all for responses, I attached a sketch to make it more clear, I guess it's a typical design. a company with two branches, each has it's own ISP, and there is a leased line connected between those two branches. both branches must communicate between each other through the leased line, and the internet access for each branch must go through it's own ISP.
the problem comes when both core switches send default route into each other makes the default route comes from the gateways invalid because of the higher admin distance. there shouldn't be a default route exchanged betwen core switches from OSPF but there should be one from BGP with manipulated local preference. Also, I would like to ask please, for each branch, a default route comes to the core switch from the gateway, the core switch can decide which route to select according to the local preference which also has been managed for the upcoming traffic, but for the incoming traffic comes from the internet, the question is, if there is a link failure between the gateway and the core switch, how would the ISP know that it must go to the another gateway? ( both routers sends prefixes one of them are AS-path prepended) I hope I made it more clearer for you, looking forward for your opinions. Thank you. On Wed, Aug 3, 2011 at 5:21 PM, vikas purbiya <[email protected]>wrote: > HI Ghaleb > > What you are trying to say isnt possible , as in OSPF the routers in an > area has to have a same view in respect to the OSPF database > So you wont be able to filter the LSA outbound, however on each router > inbound direction you can apply distribute list and then block the > particular entries. > > > > On Wed, Aug 3, 2011 at 6:30 AM, Ghaleb Salah <[email protected]> wrote: > >> Dears, in OSPF, how is it possible to send default routes on a specific >> interfaces within backbone area. >> >> Thanks >> Ghaleb >> _______________________________________________ >> 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 >> > > -- Ghaleb Salah Jerusalem, Mount of Olives. +972 547 327 377
_______________________________________________ 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
