On Wed, 2004-12-08 at 17:03 +0000, Rolo Tomassi wrote: > Hi all, > > Please forgive the simplistic nature of the query.. > > Basically my company is multi-homed with 2 different providers in the UK, > and advertising a /18. Now some colleaguges in another part of the world > want to break that /18 into two /19's and advertise one /19 and we advertise > the other. This is fine, however we are NOT running IBGP in the core, > therefore the UK customers in the /19 will not be able to reach the other > /19 as there would be a loop detected through EBGP. > > Now someone mentioned that we could use AS-LOOP-IN feature which will > overcome this problem and allow us to route to each other via EBGP. I really > think this is a bad idea but until we get an internal link - I dont see a > way forward. So... anyone doing this currently in their network or have any > "best practices" way round this. I want our company to be good Netizens but > still be able to pass traffic between the 2 /19's. Well another way for solve this problem is that both parts advertise their /19. From the transit provider take your normal routing table and a default route. The default route allows the two /19's to reach each other over the transit provider(s).
-- Cheers Dg
