I'm working on a redesign of our enterprise routing. The network expanded (before my time) in a patch-work manner, and I'd like to simplify and standardize everything. It's hub and spoke, all Cisco (not changing hardware), and running EIGRP in one big (messy) AS. We run BGP up to the ISP. Between the hub and spokes we run GRE tunnels.
My thought is to segregate each spoke into its own AS for organization. Since there's really only one path from spoke to hub or spoke to spoke, I don't see a particular reason to use EIGRP, but I'm less familiar with BGP. Writing this out, it occurs to me maybe OSPF makes more sense, with the hub in area 0, and each spoke in its area.
What is your wisdom?
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