Similar to Celio's post, I thought the most common limitation for many routers when doing Internet BGP is having sufficient RAM. You might check whether your existing 7204 supports accepting more RAM and/or whether you can upgrade to a "better" processing engine (especially if it's a VXR).
Although there's nothing wrong with the sup720-3BXL, you often lose some IOS features especially if you don't have WAN cards (which are more limited in the 6500 vs. the 7600). So, you might consider replacement router such as the 7201 or perhaps a 3800 series ISR, depending on the performance you need (the 3800 ISR offer similar or better performance compared to the early 7200 NPEs).
The FIB (forwarding information base) is, I believe, is built from the routing table and is used to make forwarding packet decisions.
What IOS functions you might lose depend on the IOS version and features sets between your 7200 and the 6500, and with the latter, what hardware's installed. If you're only doing basic routing, good chance the two will be very similar.
they talk about filtering bgp if a default route is received..........How you would have to handle this situation today is to apply an inbound filter on your BGP sessions with your upstream providers that just tosses out some selective routes to get you under the 256k limit. In practice, it generally works best to just chop out the smaller network advertisements (/24 or /25 and longer masks) -- i.e. "permit 0.0.0.0/0 le 23". To do this and not cause an reachability isssue with the networks you've filtered from your table, you MUST also take a default route from at *least* one of your upstream carriers as a catch-all. This will allow you to retain most of the benefits of taking full tables from your upstreams for TE purposes, but keep you from nuking your boxes in the process.....
but how do I know if I receive a default route from my peer? in any case I added a 0.0.0.0 0.0.0.0 route pointing to my peer.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...