I'm not the most familiar with eBGP or AS usage, so apologizes if this is a simple question.
We currently own a single ASN and a large-ish (/19) IPv4 space. We currently use the same AS at all our geographically separate sites but advertise unique networks from each to our upstream. This means that we end up dropping inbound routes advertised by our other sites.
This isn't causing any current problem, and any service that needs site-site connectivity should be using private addressing which will route across our private WAN links. However, it's always bothered me that we ignore the best paths to ourselves.
Is there a traditional solution to this issue? Do organizations use unique ASNs at each site? Is there a BGP setting to accept these routes without causing loops?
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