I've been looking for an explanation about this subject for a long time. When talking to other engineers, they don't really have a good solution for that. So after a while, I decided to ask the specialists here! =)
First of all, let me start with my problem.
I'm a CE running BGP with some providers. Up to that point, everything is ok... The problem comes up when I have to decide what's the best approach for my transit network (IP address used). By transit network I mean the address used between my routers running BGP and for example my Firewalls.
Let's suppose I received a block /20 from my provider and I decide to advertise addresses /23 or any other. My question is: What's the best address to use in this L2 transit network? (Between my FWs and my Routers)
Let's suppose I use my /20 in this L2 network. To advertise more specific prefixes I'd have to create static routes pointing to the FWs for each network. However, more than one FW are in the same /23, so I couldn't point my static routes to them. Another solution would be point my static routes to the interface, thus my FWs would have to have Proxy ARP enabled. Another solution that I could use is use Secondary IP addresses on this interface connected to the L2 transit network. All of it would be if I was using a /20 and trying to advertise more specific networks.
Is there any good other solution for this problem? How about other designs? What would be the best one? Could anyone help me?
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