This was just an example. Instead of an iBGP peer between the two Internet routers, there are iBGP peers passing into an internal router (for redundancy, you could use two). This is overkill for some networks, but allows for more modularity and scalability in the network. Also allows for a central location for BGP to choose the best path based on both peers.
The use of iBGP is to pass the full internet tables into the internal device. This can only be done with BGP as no other protocol can handle that many routes.
I used private AS numbers as an example. For your config, you would need to use your ASN. If you do not have one, you can look at the requirements of obtaining one from (assuming you are in north america) http://www.arin.net Seems how you are trying to multi-home, you qualify for one as long as you have provider independent address space. Hope this helps. Let me know if you have anymore questions.
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...